CN119419704A

CN119419704A - Protection method and readable storage medium for low voltage intelligent capacitor compensation device

Info

Publication number: CN119419704A
Application number: CN202411537590.1A
Authority: CN
Inventors: 陶显升; 陶海峰; 徐晓凤; 梁正
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2024-10-31
Filing date: 2024-10-31
Publication date: 2025-02-11

Abstract

The present application provides a protection method and a readable storage medium for a low-voltage intelligent capacitor compensation device. The protection method for the low-voltage intelligent capacitor compensation device includes: when the low-voltage intelligent capacitor compensation device meets the first preset condition, controlling the switching element of the low-voltage intelligent capacitor compensation device to perform a disconnection action; obtaining a first voltage value corresponding to the static contact of the switching element, and a second voltage value corresponding to the moving contact of the switching element; determining the current potential difference of the switching element according to the first voltage value and the second voltage value; when the current potential difference of the switching element is less than or equal to the preset potential difference, cyclically executing the above steps of controlling the switching element to perform a disconnection action until the switching element meets the second preset condition; when the number of times the switching element performs a disconnection action reaches the preset number, controlling the shunt release of the low-voltage intelligent capacitor compensation device to act, so that the low-voltage intelligent capacitor compensation device is disconnected from the power grid.

Description

Protection method of low-voltage intelligent capacitance compensation device and readable storage medium

Technical Field

The application relates to the technical field of power control, in particular to a protection method of a low-voltage intelligent capacitance compensation device and a readable storage medium.

Background

Reactive compensation is a key technology for improving the power factor of a power grid by reducing the loss of a power supply transformer and a transmission line, improving the power supply efficiency and improving the power supply environment. In an electric power supply system, a low-voltage intelligent capacitance compensation device is an indispensable device for realizing reactive compensation.

In the operation process of the low-voltage intelligent capacitance compensation device, a switching element (a magnetic latching relay) in the low-voltage intelligent capacitance compensation device is required to control the on and off of a capacitor in the low-voltage intelligent capacitance compensation device. If the switching element has a short circuit fault, for example, the movable contact of the normally open contact of the magnetic latching relay is adhered to the corresponding fixed contact, the low-voltage intelligent capacitance compensation device cannot be separated from the power grid, so that reactive overcompensation and reactive power feedback phenomena can be generated, and the reliability of the low-voltage intelligent capacitance compensation device is affected.

Disclosure of Invention

The application provides a protection method of a low-voltage intelligent capacitance compensation device and a readable storage medium, which are used for solving the problem that the low-voltage intelligent capacitance compensation device cannot be separated from a power grid due to short-circuit faults of switching elements in the prior art, so that the reliability of the low-voltage intelligent capacitance compensation device is affected.

In a first aspect, the present application provides a protection method for a low-voltage intelligent capacitance compensation device, including:

Under the condition that the low-voltage intelligent capacitance compensation device meets a first preset condition, controlling a switching element of the low-voltage intelligent capacitance compensation device to execute a switching-off action, wherein the switching-off action is used for enabling the switching element to be in a switching-off state;

acquiring a first voltage value corresponding to a static contact of the switching element and a second voltage value corresponding to a movable contact of the switching element;

determining a current potential difference of the switching element according to the first voltage value and the second voltage value;

the step of controlling the switching element to execute the opening action is circularly executed until the switching element meets a second preset condition under the condition that the current potential difference of the switching element is smaller than or equal to a preset potential difference, wherein the second preset condition is that the current potential difference of the switching element is larger than the preset potential difference or the times of executing the opening action of the switching element reaches preset times, and the preset potential difference is a demarcation value for distinguishing the connection and the disconnection of the switching element;

and under the condition that the times of executing the disconnection action by the switching element reach the preset times, controlling the shunt release of the low-voltage intelligent capacitance compensation device to act so as to enable the low-voltage intelligent capacitance compensation device to be separated from a power grid.

In one possible design, the low-voltage intelligent capacitance compensation device comprises a box body, wherein the switching element and the shunt release are both installed in the box body;

The first preset condition is that the current pressure in the box body is equal to preset pressure, wherein the preset pressure is a demarcation value for distinguishing whether explosion occurs in the box body or not.

In one possible design, in the case that the low-voltage intelligent capacitance compensation apparatus meets a first preset condition, controlling the switching element of the low-voltage intelligent capacitance compensation apparatus to perform the switching-off action includes:

Receiving a first signal sent by a detection module, wherein the first signal is used for indicating that the current pressure in the box body is equal to the preset pressure;

and controlling a switching element of the low-voltage intelligent capacitance compensation device to execute a switching-off action based on the first signal.

In one possible design, the detection module is a micro switch, and the first signal is a high level signal.

In a possible design, in case the current potential difference of the switching element is less than or equal to a preset potential difference, the above-mentioned steps of controlling the switching element to perform the opening action are performed in a loop, until after the current potential difference of the switching element is not the preset potential difference, the method further comprises:

Outputting a first alarm signal and controlling the switching element to keep an off state.

In one possible design, the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase unbalanced protection condition, a power-up protection condition, and a power-down protection condition.

And outputting a second alarm signal, and controlling the switching element to execute a closing action under the condition that the low-voltage intelligent capacitance compensation device meets the normal working condition, wherein the closing action is used for enabling the switching element to be in a closing state.

In one possible design, when the number of times the switching element performs the opening action reaches a preset number of times, controlling the shunt release of the low-voltage intelligent capacitance compensation device to act so as to separate the low-voltage intelligent capacitance compensation device from the power grid, including:

When the times of the switching element executing the switching-off action reach the preset times, a first message is sent to target equipment so that the target equipment outputs target prompt information based on the first message, wherein the target prompt information is used for indicating the switching element to fail;

and controlling the action of the shunt release of the low-voltage intelligent capacitance compensation device so as to separate the low-voltage intelligent capacitance compensation device from a power grid.

In a second aspect, the application provides an electronic device comprising a memory and at least one processor;

The memory stores computer-executable instructions;

The at least one processor executes computer-executable instructions stored by the memory such that the at least one processor performs the method as described above in the first aspect or in the various possible designs of the first aspect.

In a third aspect, embodiments of the present application provide a computer-readable storage medium having stored therein computer-executable instructions which, when executed, implement a method as described in the first aspect or the various possible designs of the first aspect.

The protection method of the low-voltage intelligent capacitance compensation device comprises the steps of firstly controlling a switching element of the low-voltage intelligent capacitance compensation device to execute a switching-off action when the low-voltage intelligent capacitance compensation device meets a first preset condition and monitoring the current potential difference between a movable contact and a static contact of the switching element in real time, secondly comparing the current potential difference of the switching element with a preset potential difference, circularly controlling the switching element to execute the switching-off action until the current potential difference of the switching element is larger than the preset potential difference or until the number of times of executing the switching-off action of the switching element reaches the preset number of times, wherein when the current potential difference of the switching element is larger than the preset potential difference, the movable contact and the static contact of the switching element are separated, the switching element is in a switching-off state, the low-voltage intelligent capacitance compensation device does not conduct reactive compensation on a power grid any more, and finally, when the number of times of executing the switching-off action of the switching element reaches the preset number of times and the current potential difference of the switching element is smaller than or equal to the preset potential difference, forcedly separating the switching-off device from the low-voltage intelligent capacitance compensation device from the power grid until the number of times of preset potential differences is larger than the preset potential difference is equal to the preset, and the reactive compensation factor is further avoided, and the reactive power compensation factor is further avoided from being generated on the low-voltage compensation power grid.

Drawings

Fig. 1 is a schematic flow chart of a protection method of a low-voltage intelligent capacitance compensation device according to an embodiment of the present application;

Fig. 2 is a schematic flow chart of a protection method of another low-voltage intelligent capacitance compensation device according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of a protection method of a low-voltage intelligent capacitance compensation device according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a protection device of a low-voltage intelligent capacitance compensation device according to an embodiment of the present application;

Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used in the description of this application are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of this application and the claims and drawings are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The term "and/or" is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists, a and B may exist at the same time, and B may exist. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly.

In the description of the present application, unless otherwise indicated, the meaning of "plurality of" and "at least two" means two or more (including two), and the meaning of "plurality of" and "at least two" means two or more (including two).

In the description of the present application, unless explicitly stated and limited otherwise, the terms "connected" and "connected" should be interpreted broadly, for example, "connected" or "connected" may mean not only a physical connection but also an electrical connection or a signal connection, for example, may be a direct connection, i.e. a physical connection, or may be an indirect connection through at least one element in between, so long as electrical communication is achieved, and may also be a communication between two elements, and signal connection may also mean a signal connection through a medium, e.g. radio waves, in addition to a signal connection through an electrical circuit. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In order to enable those skilled in the art to better understand the present application, a technical solution of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, different technical features of the present application may be combined with each other.

First, terms related to one or more embodiments of the present specification will be explained.

A low-voltage intelligent capacitance compensation device is a device for improving the power factor of an electric power system, and the power quality is optimized and the power loss is reduced by automatically monitoring and adjusting the reactive power demand in the system. The low-voltage intelligent capacitance compensation device reduces reactive power of the power system through capacitance compensation current, improves power factor and enables the power system to operate more efficiently.

The low-voltage intelligent capacitance compensation device comprises a magnetic latching relay and a circuit breaker.

The magnetic latching relay is mainly used for controlling the connection and disconnection of a capacitor in the low-voltage intelligent capacitance compensation device. Unlike traditional relay, the magnetic latching relay has the advantages of energy saving, high stability and the like, and is especially suitable for the intelligent requirement of the capacitance compensation device. The magnetic latching relay has stable structure, strong electromagnetic interference resistance, stable performance even in a strong electromagnetic environment, reduced influence on the capacitance compensation device and prolonged service life of the capacitance compensation device, can realize accurate switching of a capacitor according to a controller instruction, ensures that the power factor of a power system is regulated to an optimal state in real time, and is beneficial to reducing the electric energy loss.

The breaker comprises a shunt release which is mainly used for remote control and overload protection. When the low-voltage intelligent capacitance compensation device fails or needs to be manually disconnected, the shunt release can cut off the circuit immediately, so that the safety of the low-voltage intelligent capacitance compensation device and a power grid is ensured.

Next, how to solve the problem that the low-voltage intelligent capacitance compensation device cannot be separated from the power grid due to the short-circuit fault of the switching element, thereby affecting the reliability of the low-voltage intelligent capacitance compensation device is described in detail through some specific embodiments and drawings.

Fig. 1 is a schematic flow chart of a protection method of a low-voltage intelligent capacitance compensation device according to an embodiment of the present application. As shown in fig. 1, the protection method of the low-voltage intelligent capacitance compensation device according to the embodiment of the application specifically includes S101 to S105, and the following details of S101 to S105 are described.

It should be noted that, the execution main body of the protection method of the low-voltage intelligent capacitance compensation device provided by the embodiment of the application may be a microprocessor in the low-voltage intelligent capacitance compensation device.

And S101, controlling a switching element of the low-voltage intelligent capacitance compensation device to execute a switching-off action by the microprocessor under the condition that the low-voltage intelligent capacitance compensation device meets a first preset condition.

Wherein the switching-off action is used for enabling the switching element to be in a switching-off state.

It should be noted that the switching elements in the low-voltage intelligent capacitance compensation device are divided into a co-compensation switch and a sub-compensation switch. The common compensation switch is used for switching the three-phase capacitor by adopting a delta connection method, and the sub-compensation switch is used for switching the phase capacitor by adopting a Y connection method. The switching element types in the low-voltage intelligent capacitance compensation device are classified into a first type, a semiconductor electronic switch (such as a thyristor), a second type, a compound switch (a magnetic latching relay and a thyristor), and a third type, a synchronous switch (a microprocessor-controlled magnetic latching relay).

In this embodiment, the switching element is of the synchronous switch type, i.e. the switching element is a magnetic latching relay controlled by a microprocessor.

Under the condition that the magnetic latching relay does not have faults, the microprocessor can enable the magnetic latching relay to be in an open state by controlling the magnetic latching relay to execute an opening action, and can enable the magnetic latching relay to be in a closed state by controlling the magnetic latching relay to execute a closing action.

The first preset condition is a precondition for triggering the low-voltage intelligent capacitance compensation device to execute a protection action (disconnection action).

It should be noted that, in the operation process of the low-voltage intelligent capacitance compensation device, the microprocessor of the low-voltage intelligent capacitance compensation device monitors the operation state of the low-voltage intelligent capacitance compensation device in real time, and when the low-voltage intelligent capacitance compensation device meets a first preset condition, the microprocessor sends a disconnection instruction to the magnetic latching relay of the low-voltage intelligent capacitance compensation device so as to control the magnetic latching relay to execute a disconnection action.

In this embodiment, the microprocessor determines whether the low-voltage intelligent capacitance compensation device meets a first preset condition, and when the low-voltage intelligent capacitance compensation device meets the first preset condition, controls the magnetic latching relay of the low-voltage intelligent capacitance compensation device to execute the disconnection action, so as to cut off reactive power compensation in time when the low-voltage intelligent capacitance compensation device is abnormal, avoid unnecessary overcompensation or avoid potential damage of the power grid and the low-voltage intelligent capacitance compensation device, and improve the reliability of the low-voltage intelligent capacitance compensation device.

S102, the microprocessor acquires a first voltage value corresponding to a fixed contact of the switching element and a second voltage value corresponding to a movable contact of the switching element.

The movable contact of the switching element is a contact capable of moving in the magnetic latching relay and changing in position when the magnetic latching relay is electrified or powered off, and the stationary contact of the switching element is a fixed contact which does not displace in the magnetic latching relay and is normally contacted with or disconnected from the movable contact to realize the closing or opening.

When the movable contact of the normally open contact of the magnetic latching relay is adhered to the corresponding fixed contact, the microprocessor controls the magnetic latching relay to execute the opening action, so that the movable contact of the magnetic latching relay cannot be separated from the fixed contact, and the magnetic latching relay is kept in a closed state, and cannot be normally opened.

The first voltage value corresponds to the voltage of the static contact of the switching element, and the second voltage value corresponds to the voltage of the movable contact of the switching element.

In the prior art, in the operation process of the low-voltage intelligent capacitance compensation device, the microprocessor needs to acquire the first voltage value and the second voltage value in real time so as to perform fault early warning and diagnosis, operation data recording and analysis, energy consumption monitoring and energy saving control and the like of the low-voltage intelligent capacitance compensation device.

The method for obtaining the first voltage value and the second voltage value by the microprocessor is a conventional method, and this embodiment is not described herein.

In the embodiment, the microprocessor is used for acquiring the first voltage value and the second voltage value of the magnetic latching relay in real time, so that the connection state of the fixed contact and the movable contact of the magnetic latching relay can be accurately judged, potential abnormal conditions such as contact adhesion or incomplete disconnection can be timely found, the reliability and the safety of the disconnection action of the magnetic latching relay are improved, and the stability of the low-voltage intelligent capacitance compensation device is obviously enhanced.

S103, the microprocessor determines the current potential difference of the switching element according to the first voltage value and the second voltage value.

The current potential difference of the magnetic latching relay is the difference between the first voltage value and the second voltage value of the magnetic latching relay.

In the embodiment, by calculating the potential difference between the fixed contact and the movable contact of the magnetic latching relay, the fault conditions such as contact adhesion or incomplete disconnection of the magnetic latching relay can be rapidly and accurately identified.

And S104, the microprocessor circularly executes the step of controlling the switching element to execute the opening action until the switching element meets a second preset condition under the condition that the current potential difference of the switching element is smaller than or equal to the preset potential difference.

Fig. 2 is a flow chart of a protection method of another low-voltage intelligent capacitance compensation device according to an embodiment of the application. As shown in fig. 2, after the microprocessor determines the current potential difference of the magnetic latching relay in S103, the microprocessor performs step a, which will be described in detail below.

Step a, the microprocessor judges whether the current potential difference of the switching element is smaller than or equal to a preset potential difference.

It should be noted that the microprocessor executes S104 when the current potential difference of the magnetic latching relay is less than or equal to the preset potential difference, and executes step b or step c when the current potential difference of the magnetic latching relay is greater than the preset potential difference, indicating that the stationary contact and the movable contact of the magnetic latching relay are disconnected.

The preset potential difference is a demarcation value for distinguishing connection and disconnection of the switching element.

In the actual circuit, even if the stationary contact and the movable contact of the magnetic latching relay are disconnected, a small residual voltage may exist, and thus, the preset potential difference approaches zero.

For example, the preset potential difference is 0.05V.

When the current potential difference of the magnetic latching relay is smaller than or equal to the preset potential difference, the static contact and the movable contact of the magnetic latching relay are adhered, so that the microprocessor executes S104 to control the magnetic latching relay to circularly execute the opening action and try to separate the static contact and the movable contact of the magnetic latching relay.

The second preset condition is that the current potential difference of the switching element is larger than the preset potential difference, or the times of the switching element executing the opening action reach the preset times.

It should be noted that, when the current potential difference of the magnetic latching relay is greater than the preset potential difference, it is described that the stationary contact and the movable contact of the magnetic latching relay are separated, the magnetic latching relay is in an off state, and the microprocessor executes the step b or the step c.

If the number of times that the magnetic latching relay executes the opening action reaches the preset number of times, the current potential difference of the magnetic latching relay is still smaller than or equal to the preset potential difference, and the microprocessor does not control the magnetic latching relay to execute the opening action any more, so that loss of the magnetic latching relay is avoided.

In this embodiment, the microprocessor determines whether the magnetic latching relay is in the off state by comparing the magnitude of the current potential difference of the magnetic latching relay with the magnitude of the preset potential difference. When the current potential difference of the magnetic latching relay is smaller than or equal to the preset potential difference, namely the movable contact and the fixed contact of the magnetic latching relay are adhered, the microprocessor controls the magnetic latching relay to circularly execute the opening action until the current potential difference of the magnetic latching relay is larger than the preset potential difference, or until the times of executing the opening action of the magnetic latching relay reaches the preset times, the success rate of adhering faults of the movable contact and the fixed contact of the magnetic latching relay can be effectively increased, and meanwhile, the loss of frequent operation to the magnetic latching relay is avoided.

Fig. 3 is a flow chart of a protection method of a low-voltage intelligent capacitance compensation device according to an embodiment of the application. As shown in fig. 2 and 3, S104, the microprocessor circularly executes the above steps of controlling the switching element to execute the opening action until the switching element meets the second preset condition when the current potential difference of the switching element is less than or equal to the preset potential difference, specifically, the microprocessor may judge whether the number of times the switching element executes the opening action reaches the preset number of times when the current potential difference of the switching element is less than or equal to the preset potential difference, execute S105 when the number of times the switching element executes the opening action reaches the preset number of times, and circularly execute the steps of controlling the switching element to execute the opening action until the switching element meets the second preset condition when the number of times the switching element executes the opening action does not reach the preset number of times.

And S105, controlling the shunt release of the low-voltage intelligent capacitance compensation device to act under the condition that the times of the switching element executing the switching-off action reach the preset times by the microprocessor so as to enable the low-voltage intelligent capacitance compensation device to be separated from a power grid.

The preset times can be set by the operation and maintenance personnel, and this embodiment will not be repeated.

For example, the preset number of times is two.

It should be noted that, when the number of times that the magnetic latching relay performs the opening action reaches the preset number of times, and the current potential difference of the magnetic latching relay is still smaller than or equal to the preset potential difference, it is indicated that there is serious adhesion or failure between the movable contact and the stationary contact of the magnetic latching relay, and the problem cannot be solved by repeatedly performing the opening action. Therefore, the microprocessor sends an instruction to the shunt release to cause the shunt release to completely disengage the low voltage intelligent capacitance compensation device from the power grid by opening the loop.

The shunt release can immediately cut off the connection between the low-voltage intelligent capacitance compensation device and the power grid, ensure that the low-voltage intelligent capacitance compensation device does not continue to operate or generates the phenomenon of no-work overcompensation under the fault state, avoid the power grid equipment and the low-voltage intelligent capacitance compensation device from bearing excessive current impact due to the fault, reduce the risk of fault expansion, and prolong the service lives of the low-voltage intelligent capacitance compensation device and the power grid equipment.

In this embodiment, when the number of times that the microprocessor performs the turn-off action of the magnetic latching relay reaches the preset number of times, and the current potential difference of the magnetic latching relay is still smaller than or equal to the preset potential difference, the shunt release forces the low-voltage intelligent capacitance compensation device to separate from the power grid, so that the safety protection of the low-voltage intelligent capacitance compensation device and the power grid is realized, the reactive power overcompensation and reactive power backflow caused by adhesion of the movable contact and the static contact of the magnetic latching relay are prevented, the risk of long-time current impact bearing of the low-voltage intelligent capacitance compensation device and the power grid equipment due to the fault of the magnetic latching relay is reduced, and the reliability and the service life of the low-voltage intelligent capacitance compensation device are improved.

It should be noted that, when the low-voltage intelligent capacitance compensation device is protected, if the microprocessor in S104 circularly executes the step of controlling the switching element to execute the switching-off action when the current potential difference of the switching element is less than or equal to the preset potential difference, and when the number of times of executing the switching-off action by the switching element is not equal to the preset number of times, the protection method of the low-voltage intelligent capacitance compensation device only needs to execute the steps from S101 to S104 without executing the step from S105, and if the microprocessor in S104 circularly executes the step of controlling the switching element to execute the switching-off action when the current potential difference of the switching element is less than or equal to the preset potential difference, and when the number of times of executing the switching-off action by the switching element is equal to the preset number of times, the current potential difference of the switching element is still less than or equal to the preset potential difference, the protection method of the low-voltage intelligent capacitance compensation device needs to execute the steps from S101 to S105.

In the embodiment of the application, firstly, when a low-voltage intelligent capacitance compensation device meets a first preset condition, a switching element of the low-voltage intelligent capacitance compensation device is controlled to execute a switching-off action, and the current potential difference between a movable contact and a static contact of the switching element is monitored in real time, secondly, the current potential difference of the switching element is compared with a preset potential difference, and when the current potential difference is smaller than or equal to the preset potential difference, the switching element is circularly controlled to execute the switching-off action until the current potential difference of the switching element is larger than the preset potential difference, or until the number of times of executing the switching-off action of the switching element reaches the preset number of times, wherein when the current potential difference of the switching element is larger than the preset potential difference, the movable contact and the static contact of the switching element are separated, the switching element is in a switching-off state, the low-voltage intelligent capacitance compensation device does not perform reactive compensation on a power grid any more, and finally, when the number of times of executing the switching-off action of the switching element reaches the preset number of times, and when the current potential difference of the switching element is still smaller than or equal to the preset potential difference, the shunt release is used for forcing the switching-off device to separate the low-voltage intelligent capacitance compensation device from the power grid, the switching-off device from the power grid, and the reactive power compensation is avoided to be further increased, and the reactive power consumption factor is further avoided.

In the above embodiment, the microprocessor controls the switching element to execute the switching-off action when the low-voltage intelligent capacitance compensation device meets the first preset condition. Next, the contents of one of the first preset conditions will be described in detail.

In one possible embodiment, the low voltage intelligent capacitance compensation device comprises a housing, and the switching element and the shunt release are both mounted in the housing.

It should be noted that, the installation mode of the magnetic latching relay and the shunt release in the box is the same as the installation mode of the magnetic latching relay and the shunt release in the box in the prior art, and this embodiment will not be repeated.

The first preset condition is that the current pressure in the tank body is equal to the preset pressure.

The preset pressure is a demarcation value for distinguishing whether the box body explodes or not.

It should be noted that, since explosion is usually accompanied by rapid gas expansion and rapid pressure rise, the pressure in the tank can be used as a monitoring index for monitoring potential explosion risk.

During operation of the low voltage intelligent capacitance compensation device, abnormal currents, short circuits, or component failures may cause electrical components within the tank to overheat, generate gases, or undergo a small range of chemical reactions. If these gases accumulate and cannot be discharged in time, the pressure in the tank will rise gradually, reaching a critical value indicating an increased risk of explosion.

The preset pressure is a safety critical pressure value in the box body, and when the current pressure in the box body reaches or exceeds the preset pressure, the fact that gas can be generated rapidly in the box body is indicated, and explosion of the box body is possible.

It should be noted that the preset pressure can be set by the operation and maintenance personnel, and this embodiment will not be repeated.

In this embodiment, when the current pressure in the case of the low-voltage intelligent capacitance compensation device is equal to the preset pressure, the microprocessor controls the switching element of the low-voltage intelligent capacitance compensation device to perform the switching-off operation, and performs the steps S102 to S104 or the steps S102 to S105.

In the embodiment of the application, the current pressure in the box body is set to be equal to the preset pressure as the first preset condition, and when the current pressure in the box body is equal to the preset pressure, the microprocessor of the low-voltage intelligent capacitance compensation device can control the switching element to be disconnected, or the shunt release is started to separate the low-voltage intelligent capacitance compensation device from the power grid, so that explosion risks caused by gas aggregation or abnormal reaction are prevented, and the use safety and reliability of the low-voltage intelligent capacitance compensation device are improved.

In the above embodiment, the microprocessor needs to control the switching element to execute the switching-off action when the low-voltage intelligent capacitance compensation device meets the first preset condition. Next, a specific process of controlling the switching element to execute the switching-off action when the microprocessor satisfies the first preset condition in the low-voltage intelligent capacitance compensation device will be described in detail.

In a possible embodiment, if the low-voltage intelligent capacitance compensation apparatus meets the first preset condition, the microprocessor controls the switching element of the low-voltage intelligent capacitance compensation apparatus to perform the switching-off operation in S101 and S1012, which are described in detail below with respect to S1011 and S1012.

S1011, the microprocessor receives the first signal sent by the detection module.

The first signal is used for indicating that the current pressure in the box body is equal to the preset pressure.

It should be noted that the detection module is used for detecting the current pressure in the box in real time. And when the detection module detects that the current pressure in the box body is smaller than the preset pressure, a second signal is sent to the microprocessor, and the second signal is used for indicating that the current pressure in the box body is smaller than the preset pressure.

The detection module may be a sensor module capable of detecting pressure changes in the case in real time, such as a pressure sensor (piezoresistive pressure sensor, capacitive pressure sensor, optical fiber pressure sensor), a micro switch, and a differential pressure switch, which is not particularly limited in this embodiment.

In this embodiment, detect the current pressure in the box in real time through setting up detection module to when detecting that current pressure in the box equals to predetermineeing pressure, send first signal to microprocessor, for follow-up low pressure intelligent capacitance compensation device's protection operation provides accurate, real-time triggering condition, make low pressure intelligent capacitance compensation device can start the safeguard measure rapidly when current pressure in the box reaches predetermineeing pressure, prevent the box explosion, promoted low pressure intelligent capacitance compensation device's safety in utilization.

And S1012, the microprocessor controls the switching element of the low-voltage intelligent capacitance compensation device to execute the disconnection action based on the first signal.

It should be noted that, after receiving the first signal sent by the detection module, the microprocessor controls the switching element to execute the disconnection action so as to cut off the connection between the capacitor in the low-voltage intelligent capacitance compensation device and the power grid, so that the low-voltage intelligent capacitance compensation device stops reactive compensation, and the low-voltage intelligent capacitance compensation device is prevented from running continuously in a dangerous state.

In the embodiment of the application, the detection module is arranged to detect the current pressure in the box body in real time, so that when the current pressure in the box body reaches the preset pressure, the microprocessor can immediately receive the first signal sent by the detection module and control the switching element to execute the switching-off action, thereby realizing the quick response to the abnormal pressure in the box body, preventing the potential safety hazard caused by the excessive high pressure, effectively preventing the risk of explosion of the low-voltage intelligent capacitance compensation device, prolonging the service life of the low-voltage intelligent capacitance compensation device and obviously enhancing the use safety and reliability of the low-voltage intelligent capacitance compensation device.

In the above embodiment, the microprocessor needs to receive the first signal sent by the detection module. Next, a specific structure of the detection module will be described in detail.

In one possible embodiment, the detection module is a micro switch, and the first signal is a high level signal.

A microswitch is a switching device in which pressure or other physical changes are detected by mechanical contacts. The contact of the micro switch is automatically triggered when the pressure reaches the preset pressure and is converted into an electric signal.

The micro switch is installed on the case and extends into the case.

When the current pressure in the box body is equal to the preset pressure, the micro switch is triggered, and the micro switch outputs a high-level signal (first signal) and sends the first signal to the microprocessor.

When the current pressure in the box body is smaller than the preset pressure, the micro switch is not triggered, and outputs a low-level signal (second signal) and sends the second signal to the microprocessor. And the microprocessor does not execute any action under the condition of receiving the second signal sent by the micro switch.

In the embodiment of the application, the micro switch is set as the detection module, and the current pressure in the box body is simply, conveniently and reliably monitored through the micro switch. When the current pressure in the box reaches the preset pressure, the micro switch sends a high-level signal to the microprocessor, and the microprocessor immediately controls the switching element to execute the switching-off action according to the high-level signal, so that the low-voltage intelligent capacitance compensation device is prevented from continuously running under abnormal pressure, potential safety hazards are effectively reduced, and the stable running of the low-voltage intelligent capacitance compensation device is conveniently ensured.

In the above embodiment, the microprocessor needs to circularly execute the above steps of controlling the switching element to execute the opening action until the current potential difference of the switching element is greater than the preset potential difference when the current potential difference of the switching element is less than or equal to the preset potential difference. Next, the step b to be executed by the micro-processing is described in detail after the first preset condition is that the current pressure in the box body is equal to the preset pressure, the low-voltage intelligent capacitance compensation device meets the first preset condition, and the current potential difference of the switching element is larger than the preset potential difference.

Fig. 2 is a flow chart of a protection method of another low-voltage intelligent capacitance compensation device according to an embodiment of the application. In a possible embodiment, as shown in fig. 2, in S104, the microprocessor circularly executes the above-mentioned steps of controlling the switching element to perform the opening action until the switching element meets the second preset condition when the current potential difference of the switching element is smaller than or equal to the preset potential difference, and the method further includes step b, which is described in detail below.

And b, outputting a first alarm signal by the microprocessor, and controlling the switching element to keep an off state.

And under the condition that the first preset condition is that the current pressure in the box body is equal to the preset pressure, the low-voltage intelligent capacitance compensation device meets the first preset condition, and the current potential difference of the switching element is larger than the preset potential difference, the microprocessor outputs a first alarm signal and controls the switching element to keep an off state.

The first alarm signal is used for prompting operation and maintenance personnel that the low-voltage intelligent capacitance compensation device is out of order, and the switching element is in a disconnected state.

It should be noted that, the microprocessor may output the first alarm signal through a display in the low-voltage intelligent capacitance compensation device, or may output the first alarm signal through other manners, which is not limited in this embodiment.

And the microprocessor controls the switching element to execute the switching-off action under the condition that the low-voltage intelligent capacitance compensation device meets the condition that the current pressure in the box body is equal to the preset pressure. In order to prevent the explosion of the box body caused by the unexpected closing of the switching element under the condition that the fault in the box body is not completely removed, the microprocessor needs to further control the switching element to keep the switching element in an open state, so that the switching element is ensured not to be closed again under the condition that the current pressure in the box body is higher than the preset pressure, potential safety hazards are prevented, explosion risks caused by the continuation of reactive compensation are avoided, and the use safety and reliability of the low-voltage intelligent capacitance compensation device in a dangerous environment are obviously improved.

In the embodiment of the application, when the current pressure in the box body of the low-voltage intelligent capacitance compensation device is equal to the preset pressure and the current potential difference of the switching element is larger than the preset potential difference, the microprocessor outputs the first alarm signal and controls the switching element to keep the switching element in the off state, so that the switching element is not closed any more, explosion risks caused by accidental operation of the low-voltage intelligent capacitance compensation device are prevented, the use reliability and safety of the low-voltage intelligent capacitance compensation device in dangerous environments are improved, timely fault feedback is provided for operation and maintenance personnel, and the overall safety performance of the low-voltage intelligent capacitance compensation device is obviously enhanced.

In the above embodiment, the microprocessor controls the switching element to execute the switching-off action when the low-voltage intelligent capacitance compensation device meets the first preset condition. Next, the contents of another first preset condition will be described in detail.

In another possible embodiment, the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase unbalanced protection condition, a power-up protection condition, and a power-down protection condition.

It should be noted that the low-voltage intelligent capacitance compensation device triggers overvoltage protection when the grid voltage exceeds the rated value. The excessively high voltage may damage the capacitor and the switching element in the low-voltage intelligent capacitance compensation device, and thus, the first preset condition may be an overvoltage protection condition.

When the voltage of the power grid is lower than the rated value, the low-voltage intelligent capacitance compensation device can trigger under-voltage protection and cut off reactive compensation of the capacitor so as to avoid invalid compensation, and therefore, the first preset condition can also be an under-voltage protection condition.

When three-phase voltage or current in the power grid is unbalanced, abnormal heating and even damage of the low-voltage intelligent capacitance compensation device and other equipment can be caused, and therefore, the first preset condition can also be a three-phase unbalanced protection condition.

The low-voltage intelligent capacitance compensation device may be damaged due to the transient impact during power-up, and therefore, the first preset condition may also be a power-up protection condition.

The power-down protection condition is triggered when the low-voltage intelligent capacitance compensation device is powered off or power is interrupted, so that impact current caused by suddenly recovering power supply is prevented from affecting the low-voltage intelligent capacitance compensation device, and therefore, the first preset condition can also be the power-down protection condition.

In addition, the first preset condition may be an over-temperature protection condition, a harmonic voltage over-limit protection condition, a harmonic current over-limit protection condition, a phase-failure protection condition, and the like, which is not limited in particular in this embodiment.

The contents of the overtemperature protection condition, the harmonic voltage overtemperature protection condition, the harmonic current overtemperature protection condition and the open-phase protection condition are the same as those of the overtemperature protection condition, the harmonic voltage overtemperature protection condition, the harmonic current overtemperature protection condition and the open-phase protection condition in the prior art, and the embodiment is not repeated.

In the embodiment of the application, the adaptability and the protection capability of the low-voltage intelligent capacitance compensation device under various power abnormal states are obviously enhanced by setting the overvoltage protection condition, the undervoltage protection condition, the three-phase unbalanced protection condition, the power-on protection condition or the power-off protection condition as the first preset condition. The intelligent low-voltage capacitance compensation device has the technical effects that the intelligent low-voltage capacitance compensation device can rapidly respond when the power environment abnormally fluctuates, the switching element is controlled to execute the switching-off action, the reactive compensation function of the intelligent low-voltage capacitance compensation device is cut off, the intelligent low-voltage capacitance compensation device is prevented from being damaged or failed, the safe operation of the intelligent low-voltage capacitance compensation device under the complex power condition is ensured, and therefore the stability and the reliability of the intelligent low-voltage capacitance compensation device are effectively improved.

In the above embodiment, the microprocessor needs to circularly execute the above steps of controlling the switching element to execute the opening action until the current potential difference of the switching element is greater than the preset potential difference when the current potential difference of the switching element is less than or equal to the preset potential difference. Next, the step c of the micro-processing to be executed after the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase imbalance protection condition, a power-on protection condition and a power-off protection condition, the low-voltage intelligent capacitance compensation device meets the first preset condition, and the current potential difference of the switching element is larger than the preset potential difference is described in detail.

Fig. 3 is a flow chart of a protection method of a low-voltage intelligent capacitance compensation device according to an embodiment of the application. In another possible embodiment, as shown in fig. 3, in S104, the microprocessor circularly executes the above-mentioned steps of controlling the switching element to perform the opening action until the switching element meets the second preset condition when the current potential difference of the switching element is less than or equal to the preset potential difference, and the method further includes step c, which is described in detail below.

And c, outputting a second alarm signal by the microprocessor, and controlling the switching element to execute a closing action under the condition that the low-voltage intelligent capacitance compensation device meets the normal working condition.

Wherein the closing action is used to put the switching element in a closed state.

And when the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase unbalanced protection condition, a power-on protection condition and a power-off protection condition, the low-voltage intelligent capacitance compensation device meets the first preset condition, and the current potential difference of the switching element is larger than the preset potential difference, the microprocessor outputs a second alarm signal, and when the low-voltage intelligent capacitance compensation device meets the normal working condition, the switching element is controlled to execute a closing action.

The second alarm signal is used for prompting operation and maintenance personnel that the fault of the low-voltage intelligent capacitance compensation device is eliminated, and the switching element is restored to a controllable state.

It should be noted that, the microprocessor may output the second alarm signal through a display in the low-voltage intelligent capacitance compensation device, or may output the second alarm signal through other manners, which is not limited in this embodiment.

And the normal working condition is that parameters such as voltage, current and the like of the power grid are restored to a safe range.

And the microprocessor controls the switching element to execute the disconnection action under the condition that the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase unbalanced protection condition, a power-on protection condition and a power-off protection condition and the low-voltage intelligent capacitance compensation device meets the first preset condition. Under the condition that the low-voltage intelligent capacitance compensation device meets normal working conditions, the microprocessor controls the switching element to execute closing action, so that the low-voltage intelligent capacitance compensation device can recover reactive compensation operation after safety detection, and the influence on power factor and electric energy quality of a power grid caused by long-time shutdown of the low-voltage intelligent capacitance compensation device is avoided.

In the embodiment of the application, the microprocessor outputs the second alarm signal when the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase unbalanced protection condition, a power-on protection condition and a power-off protection condition, and the low-voltage intelligent capacitance compensation device meets the first preset condition, and outputs the second alarm signal when the current potential difference of the switching element is larger than the preset potential difference, and controls the switching element to execute the closing action when the low-voltage intelligent capacitance compensation device meets the normal working condition, so that the low-voltage intelligent capacitance compensation device can recover reactive compensation operation after safety detection, and the influence on the power factor and the power quality of a power grid caused by long-time shutdown of the low-voltage intelligent capacitance compensation device is avoided.

In the above embodiment, the microprocessor needs to control the shunt release of the low-voltage intelligent capacitance compensation device to act when the number of times that the switching element performs the switching-off action reaches the preset number of times, so that the low-voltage intelligent capacitance compensation device is separated from the power grid. Next, under the condition that the times of the microprocessor executing the disconnection action of the switching element reach the preset times, the shunt release of the low-voltage intelligent capacitance compensation device is controlled to act, so that the specific process of separating the low-voltage intelligent capacitance compensation device from the power grid is described in detail.

In one possible embodiment, when the number of times the switching element performs the opening action reaches the preset number of times, the microprocessor controls the shunt release of the low-voltage intelligent capacitance compensation device to act so as to disconnect the low-voltage intelligent capacitance compensation device from the power grid, which can be implemented through S1051 and S1052, and S1051 and S1052 are described in detail below.

S1051, the microprocessor sends a first message to the target equipment when the times of the switching element executing the switching-off action reach the preset times, so that the target equipment outputs target prompt information based on the first message.

Under the condition of reactive power compensation to the power grid, a plurality of low-voltage intelligent capacitance compensation devices are required to work simultaneously so as to perform reactive power compensation to the power grid.

The target device may be a microprocessor of a target low-voltage intelligent capacitance compensation device of the plurality of low-voltage intelligent capacitance compensation devices, or may be a controller dedicated to managing the plurality of low-voltage intelligent capacitance compensation devices, which is not particularly limited in this embodiment.

It should be noted that the target low-voltage intelligent capacitance compensation device is a low-voltage intelligent capacitance compensation device selected from a plurality of low-voltage intelligent capacitance compensation devices based on a host election rule. The host election rule is an existing rule, and this embodiment is not described in detail.

The first message is used for notifying the target equipment that the switching element of the low-voltage intelligent capacitance compensation device where the microprocessor is located is out of order.

It should be noted that the first message may be a fault alarm message. For example, "switching element failure, please check.

The target prompt information is used for indicating the fault of the switching element.

The target prompt information is used for indicating the fault of the switching element and prompting operation and maintenance personnel to take necessary inspection and maintenance measures on the switching element.

In this embodiment, the microprocessor may send the first message to the target device, so that the target device outputs the target prompt information based on the first message, or the target device may detect the state of the low-voltage intelligent capacitance compensation device in real time, and when detecting that the switching element of the low-voltage intelligent capacitance compensation device fails, actively output the target prompt information.

S1052, the microprocessor controls the shunt release of the low-voltage intelligent capacitance compensation device to act so as to separate the low-voltage intelligent capacitance compensation device from the power grid.

It should be noted that, the implementation manner of S1052 is detailed in the implementation manner of the embodiment shown in S105, and this embodiment will not be described in detail.

In the embodiment of the application, when the number of times of the magnetic latching relay executing the opening action reaches the preset number of times and the current potential difference of the magnetic latching relay is still smaller than or equal to the preset potential difference, a first message is sent to the target equipment, so that the target equipment outputs target prompt information based on the first message to prompt operation and maintenance personnel to take necessary checking and maintenance measures on the switching element, and meanwhile, the shunt release forcedly separates the low-voltage intelligent capacitance compensation device from the power grid, thereby realizing the safety protection of the low-voltage intelligent capacitance compensation device and the power grid, preventing reactive power overcompensation and reactive power pouring problems caused by the adhesion of the movable contact and the fixed contact of the magnetic latching relay, reducing the risk of long-time bearing current impact of the low-voltage intelligent capacitance compensation device and the power grid equipment due to the fault of the magnetic latching relay, and further improving the reliability and the service life of the low-voltage intelligent capacitance compensation device.

Fig. 4 is a schematic structural diagram of a protection device of a low-voltage intelligent capacitance compensation device according to an embodiment of the present application. As shown in fig. 4, the protection device 400 of the low-voltage intelligent capacitance compensation apparatus provided in this embodiment may exist independently, and be used to implement the operation corresponding to the microprocessor in the above-described method embodiment.

The protection apparatus 400 of the low voltage intelligent capacitance compensation device may include a transceiver module 401 and a processing module 402. The processing module 402 is configured to perform data processing, and the transceiver module 401 may implement corresponding communication functions. Transceiver module 401 may also be referred to as a communication interface or a communication unit.

Optionally, the protection device 400 of the low-voltage intelligent capacitance compensation apparatus may further include a storage unit, where the storage unit may be used to store instructions and/or data, and the processing module 402 may read the instructions and/or data in the storage unit, so that the protection device 400 of the low-voltage intelligent capacitance compensation apparatus implements the steps implemented by the microprocessor in the foregoing method embodiment.

The transceiver module 401 is configured to perform operations related to the reception of the microprocessor in the foregoing method embodiment, and the processing module 402 is configured to perform operations related to the processing of the microprocessor in the foregoing method embodiment.

Alternatively, the transceiver module 401 may include a transmitting module and a receiving module. The sending module is configured to perform the sending operation in the method embodiment. The receiving module is configured to perform the receiving operation in the above method embodiment.

It should be noted that, the protection device 400 of the low-voltage intelligent capacitance compensation apparatus may include a transmitting module, and not include a receiving module. Or the protection device 400 of the low voltage intelligent capacitance compensation apparatus may include a receiving module instead of a transmitting module. In particular, it may be possible to determine whether the scheme performed by the protection device 400 of the low-voltage intelligent capacitance compensation apparatus includes a transmitting action and a receiving action.

As an example, the protection device 400 of the low voltage intelligent capacitance compensation arrangement is used to perform the actions performed by the microprocessor in the embodiment shown in fig. 1 above.

The protection apparatus 400 of the low voltage intelligent capacitance compensation device may include a transceiver module 401 and a processing module 402.

And the processing module 402 is configured to control the switching element of the low-voltage intelligent capacitance compensation device to perform a switching-off action when the low-voltage intelligent capacitance compensation device meets a first preset condition, where the switching-off action is used to make the switching element be in a switching-off state.

The processing module 402 is further configured to obtain a first voltage value corresponding to a stationary contact of the switching element and a second voltage value corresponding to a movable contact of the switching element.

The processing module 402 is further configured to determine a current potential difference of the switching element according to the first voltage value and the second voltage value.

The processing module 402 is further configured to, when the current potential difference of the switching element is less than or equal to a preset potential difference, circularly perform the step of controlling the switching element to perform the opening action until the switching element meets a second preset condition, where the second preset condition is that the current potential difference of the switching element is greater than the preset potential difference, or the number of times the switching element performs the opening action reaches a preset number of times, and the preset potential difference is a demarcation value for distinguishing between connection and disconnection of the switching element.

The processing module 402 is further configured to control the shunt release of the low-voltage intelligent capacitance compensation device to act when the number of times that the switching element performs the switching-off operation reaches a preset number of times, so that the low-voltage intelligent capacitance compensation device is separated from the power grid.

It should be understood that, the foregoing corresponding process performed by each module is already described in the foregoing method embodiments, and is not described herein for brevity.

The processing module 402 in the previous embodiments may be implemented by at least one processor or processor-related circuitry. Transceiver module 401 may be implemented by a transceiver or transceiver-related circuitry. Transceiver module 401 may also be referred to as a communication unit or a communication interface. The memory unit may be implemented by at least one memory.

Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 5, the electronic device 500 provided in this embodiment includes a memory 501 and a processor 502.

Wherein the memory 501 may be a separate physical unit and may be connected to the processor 502 by a bus 503. The memory 501 and the processor 502 may be integrated, implemented by hardware, or the like. The memory 501 is used to store program instructions that the processor 502 invokes to perform the operations performed by the microprocessor in any of the method embodiments.

Alternatively, when some or all of the methods of the above embodiments are implemented in software, the electronic device 500 may include only the processor 502. The memory 501 for storing programs is located outside the electronic device 500, and the processor 502 is connected to the memory through a circuit/wire for reading and executing the programs stored in the memory. The processor 502 may be a central processor (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP. The processor 502 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (programmable logic device, PLD), or a combination thereof. The PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field-programmable gate array (FPGA) GATE ARRAY, generic array logic (GENERIC ARRAY logic, GAL), or any combination thereof.

The memory 501 may comprise volatile memory (RAM), such as random-access memory (RAM), non-volatile memory (flash memory), such as flash memory (flash memory), hard disk (HARD DISK DRIVE, HDD) or solid state disk (solid-state disk) (STATE DRIVE, SSD), or a combination of the above.

The application provides a chip, which comprises an interface circuit and a logic circuit, wherein the interface circuit is used for receiving signals from other chips outside the chip and transmitting the signals to the logic circuit, or sending the signals from the logic circuit to the other chips outside the chip, and the logic circuit is used for executing the operations executed by the microprocessor in the embodiment of the method.

Illustratively, the present application provides a computer-readable storage medium having stored thereon computer program instructions that are executed by a processor of an electronic device to cause the electronic device to perform the operations performed by the microprocessor in the above method embodiments.

The present application illustratively provides a computer program product which, when run on an electronic device, causes the electronic device to perform the operations performed by the microprocessor in the above method embodiments.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection method for a low-voltage intelligent capacitor compensation device, characterized in that the method comprises:

When the low-voltage intelligent capacitor compensation device meets the first preset condition, controlling the switching element of the low-voltage intelligent capacitor compensation device to perform a disconnection action; wherein the disconnection action is used to put the switching element in a disconnected state;

Acquire a first voltage value corresponding to the stationary contact of the switching element, and a second voltage value corresponding to the moving contact of the switching element;

In the case where the current potential difference of the switching element is less than or equal to the preset potential difference, the above steps of controlling the switching element to perform the disconnection action are cyclically performed until the switching element meets a second preset condition; wherein the second preset condition is that the current potential difference of the switching element is greater than the preset potential difference, or the number of times the switching element performs the disconnection action reaches a preset number; the preset potential difference is a dividing value for distinguishing between connection and disconnection of the switching element;

When the number of disconnection actions performed by the switching element reaches a preset number, the shunt release of the low-voltage intelligent capacitor compensation device is controlled to operate so that the low-voltage intelligent capacitor compensation device is disconnected from the power grid.

2. The method according to claim 1, characterized in that the low-voltage intelligent capacitor compensation device comprises a box, and the switching element and the shunt release are both installed in the box;

The first preset condition is that the current pressure in the box is equal to the preset pressure; wherein the preset pressure is a dividing value for distinguishing whether the box explodes.

3. The method according to claim 2 is characterized in that, when the low-voltage intelligent capacitor compensation device meets the first preset condition, controlling the switching element of the low-voltage intelligent capacitor compensation device to perform a disconnection action comprises:

Receive a first signal sent by a detection module; wherein the first signal is used to indicate that the current pressure in the box is equal to the preset pressure;

Based on the first signal, the switching element of the low-voltage intelligent capacitor compensation device is controlled to perform a disconnection action.

4 . The method according to claim 3 , wherein the detection module is a micro switch and the first signal is a high level signal.

5. The method according to claim 2, characterized in that, when the current potential difference of the switching element is less than or equal to the preset potential difference, the step of controlling the switching element to perform the disconnection action is cyclically performed until the current potential difference of the switching element is not the preset potential difference, and the method further comprises:

A first alarm signal is output, and the switching element is controlled to remain in an off state.

6. The method according to claim 1, characterized in that the first preset condition is at least one of an overvoltage protection condition, an undervoltage protection condition, a three-phase unbalance protection condition, a power-on protection condition, and a power-off protection condition.

7. The method according to claim 6, characterized in that, when the current potential difference of the switching element is less than or equal to the preset potential difference, the step of controlling the switching element to perform the disconnection action is cyclically performed until the current potential difference of the switching element is not the preset potential difference, and the method further comprises:

A second alarm signal is outputted, and when the low-voltage intelligent capacitor compensation device meets normal working conditions, the switching element is controlled to perform a closing action; wherein the closing action is used to put the switching element in a closed state.

8. The method according to claim 1 is characterized in that, when the number of disconnection actions performed by the switching element reaches a preset number, the shunt release of the low-voltage intelligent capacitor compensation device is controlled to operate so that the low-voltage intelligent capacitor compensation device is disconnected from the power grid, comprising:

When the number of times the switching element performs the disconnection action reaches a preset number, sending a first message to a target device so that the target device outputs target prompt information based on the first message; wherein the target prompt information is used to indicate a fault of the switching element;

The shunt release of the low-voltage intelligent capacitor compensation device is controlled to operate so that the low-voltage intelligent capacitor compensation device is disconnected from the power grid.

9. An electronic device, comprising: a memory and at least one processor;

The memory stores computer-executable instructions;

The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the method according to any one of claims 1 to 8 is implemented.