KR101449706B1 - Distributing board for realtime segmented sensing fault, harmonic wave and grounding resistance of power line and having a brocking and recovering function - Google Patents

Abstract

The present invention relates to a distributing board for detecting a real-time segmented sensing fault, a harmonic wave, and a grounding resistance value, and having a blocking and recovering function due to the generation of an error. The distributing board for detecting a real-time segmented sensing fault, a harmonic wave, and a grounding resistance value and having a blocking and recovering function due to the generation of an error according to one embodiment of the present invention includes: an extra-high voltage part, a transformer, a low pressure part, a control part, and a display part. According to one embodiment of the present invention, the extra-high voltage part includes a second leakage current sensor. More particularly, in an aspect of the present invention, the distributing board for detecting a real-time segmented sensing fault, a harmonic wave and a grounding resistance value and having a blocking and recovering function due to the generation of an error can include other embodiments.

Description

TECHNICAL FIELD [0001] The present invention relates to a distribution board having a function of intercepting and recovering a line abnormality, a harmonic and a grounding resistance of each real-time section, }

The present invention relates to a switchboard having a function of blocking and restoring a line abnormality and a harmonic and a ground resistance value of each real-time section by measuring and detecting abnormality, more specifically, detecting a real-time line abnormality, And has a function of immediately blocking and restoring the line in the event of an abnormality, and is about a power transmission and distribution panel informing an administrator.

Generally, a switchgear is a device concentrating in one place with various facilities and equipments for power transmission from a power source such as a power station or a substation to power transmission of special high voltage, decompression conversion to rated power suitable for actual use, and distribution to each element. The switchgear is classified into a high-voltage and a low-voltage class based on a transformer, and each includes various switching devices for safety, a breaking device, and a measuring device.

In order to perform the normal function, the temperature and humidity conditions must be maintained in an optimum state, and human activity is installed in a rare position or the internal state Because it is difficult to sense or judge from the outside, it may cause fire due to external factors such as lightning, component failure, deterioration and insulation breakdown, internal factors such as short circuit caused by the deterioration of the line or equipment, There is a problem that it can not respond quickly.

Therefore, in order to have surveillance, control and protection functions, the switchgear implements various relays such as overcurrent, overvoltage, undercurrent, undervoltage, ground fault, and current, voltage, power, frequency and phase. Is increasing. Especially, due to the progress of industrialization, the accident caused by abnormality of the switchboard is not only directly damages such as fire and electric shock but also indirect damage of the customer receiving electricity by the power distribution equipment, that is, damage due to data loss due to power failure, Is an astronomical trend.

In addition, there is a problem that it is almost impossible to find the abnormal part in the case that the whole system of the switchgear is searched to find the abnormal part of the switchgear to recover after the abnormalities of the switchgear and the switchgear is greatly damaged.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a switchboard that can judge whether or not a switchboard is abnormal in real time.

Another object of the present invention is to provide a switchboard capable of instantaneously recognizing various anomalies that may occur in a switchboard such as disconnection of a switchboard line, leakage current, and harmonic generation.

In addition, the present invention aims to provide a switchboard that enables a manager to know immediately when an abnormality occurs in a switchboard.

According to an aspect of the present invention, there is provided a switchgear comprising an extra high voltage unit, a transformer unit, a low voltage unit, a control unit, and a display unit. The super high voltage unit secures a double power source from the power source, (ALTS) connected to the output terminal of the automatic load changeover switch and connected to the output terminal of the load change switch (LBS) to prevent the load current interruption and phase loss, and discharging the abnormal current to the ground (HPF) connected to the output terminal of the load switch, an instrument transformer (MOF) connected to the output terminal of the special high-voltage cut-off fuse and measuring the electricity usage, and the output terminal of the instrument transformer And a vacuum circuit breaker (VCB) for performing shut-off of the high-voltage line in a high-vacuum container by opening and closing the contact. The load break switch (LBS) A first section detection sensor formed between the fuse (HPF) and detecting an abnormal current, a second section detection sensor formed between the special high-pressure portion cut-off fuse (HPF) and the instrumentation transformer (MOF) A third section detection sensor formed between the transformer MOF and the vacuum breaker VCB to detect an abnormal current, a vacuum circuit breaker VCB and a fourth section sensor formed between the input line of the transformer and detecting an abnormal current A first leakage current sensor formed at an input terminal of the lightning arrester LA to sense a leakage current, a second leakage current sensor connected to the gate of the ground bus bar or the special high voltage insulation box for detecting a leakage current leaking through the special high voltage insulation box, Wherein the transformer includes a transformer for converting high voltage power into low voltage power and includes a third leakage current sensor connected to the transformer and is connected to the ground bus bar or the door of the transformer enclosure, A harmonic current sensing sensor connected to the output terminal of the transformer for sensing a harmonic current, a harmonic voltage sensing circuit connected in parallel to the output terminal of the transformer for detecting a harmonic voltage, a fourth leakage current sensor for detecting a leakage current leaking through the transformer, (ACB), which is a circuit breaker for opening and closing the contact between the contacts of the electric circuit, an electric power factor improving capacitor connected in parallel to the output terminal of the air circuit breaker, and an instrument connected to the output terminal of the air circuit breaker And a fifth interval detection sensor connected to the output terminal of the instrumental current transformer for detecting an abnormal current and connected to the door of the ground bus bar or the low voltage section enclosure for detecting a leakage current leaking through the low voltage enclosure And a fifth leakage current sensor, and the control unit includes a first interval sensor to a fifth interval sensor, a first leakage current sensor, A fifth leakage current sensor, a harmonic current detection sensor, and an A / D converter connected to an output terminal of the harmonic current detection sensor and converting an analog signal into a digital signal, wherein the abnormality of the sensing data of the sensors is determined, do.

Here, the first to fifth sensing sensors may be CTs, the first to fifth leakage current sensors may be CTs, and the switchgear may include a first leakage current (PT) corresponding to a plurality of leakage current sensors that are connected in parallel with a lead connected to the fifth sensor to the fifth leakage current sensor and measure the voltage between the ground and the ground.

Here, the display unit displays the presence / absence of abnormal current sensed by the first to fifth sensing sensors, the presence / absence of an abnormal leakage current sensed by the first to fifth leakage current sensors, the harmonic current / voltage sensing And a plurality of light sources for visually determining whether abnormal harmonics are detected by the sensor, wherein the current data of the first to fifth leakage current sensors and the plurality of leakage current sensors are connected in parallel, And a ground resistance display unit for displaying the ground resistance value calculated by the control unit through the voltage data of the system PT.

Here, the switchboard may further include a voice alarm device connected to the control unit and generating a sound alarm when an abnormality occurs in the switchboard.

The switching center may further include a communication network device connected to the control unit and transmitting an abnormal signal to the terminal of the manager when an abnormality occurs in the switching center.

Here, the control unit may include a processor for comparing the sensing data input from the AD converter (ADC) with the stored reference data to determine whether there is an abnormality and controlling the circuit breaker on the line, a memory A display output module connected to the processor for outputting a signal for controlling the display unit, a switchboard control signal output module connected to the processor for outputting a power cutoff signal of an interval or an earth terminal in which an error occurs, Interface.

According to the embodiment of the present invention, it is possible to find the line abnormality of the transmission / reception panel in real time, and it is easy to know the section where the abnormality occurs when the abnormality of the transmission / reception panel occurs. In addition, it is possible to check not only the voltage and current supplied to the switchgear, but also the leakage current and the ground resistance as a whole. In addition, when an abnormality occurs in the power switchboard, it is possible to recognize the occurrence of an abnormality directly through the communication network to the manager so that an immediate response is possible.

1 is a schematic circuit diagram of a switchboard according to an embodiment of the present invention.
2 is a block diagram of a switchboard according to an embodiment of the present invention.
3 is a functional block diagram of a control unit of a switchboard according to an embodiment of the present invention.
4 is a block diagram of a system connected to a grounding resistance display device of a switchboard according to an embodiment of the present invention.
5 is a front view of an enclosure of a switchboard according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in various forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention in the drawings, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification. Whenever a part includes an element throughout the specification, it does not exclude other elements unless specifically stated otherwise, but may include other elements.

The present invention relates to a power transmission / reception system that receives power from a power supplier and converts a high-voltage power to a low voltage and supplies the converted low-voltage power to a customer. The power transmission and distribution board according to an embodiment of the present invention includes an extra- A low pressure section, a control section, and a display section.

The switchgear according to an embodiment of the present invention is provided with a detection sensor for judging in real time whether there is an abnormality in the power line in the extra high voltage section, the transformer section, and the low voltage section, and the deterioration, component failure, So that the user can easily find the section where the abnormality occurs due to a problem such as a short circuit caused by the abnormality.

Also, according to one embodiment of the present invention, a switchgear is provided with a leakage current detecting sensor at the ground of a lightning arrester, an enclosure, and a transformer to prevent leakage of electric current, .

In addition, the switchgear according to an embodiment of the present invention senses a harmonic current, which is an unbalanced current that may occur in a neutral line of a three-phase four-wire power line, and provides a cutoff switch or a harmonic cutoff filter to remove the unbalanced current.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a switchboard according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a schematic circuit diagram of a switchboard according to an embodiment of the present invention.

Referring to FIG. 1, a circuit component included in a switchboard according to an embodiment of the present invention will be described.

First, ALTS is an automatic load switching switch that automatically supplies a constant power by automatically switching to the standby power source when main power interruption or when the voltage of the main power source falls below the reference value by securing dual power source from the power source.

LBS is a load switch that is often used as an input switch of a power distribution system. It is installed in combination with a power fuse as well as a load current breaker. When a power fuse of one phase is disconnected, all phases are automatically tripped .

HPF is a high-voltage half-power fuse, which is a fuse for short-circuit protection of high-voltage and special-high-voltage equipment, and a high-arc fuse is used in which short-circuit current is forcibly suppressed by generating a high arc resistance.

LA is a lightning arrester that discharges to the ground an abnormal voltage that enters the inside to protect electrical equipment and lines when an external abnormal voltage such as a lightning strike enters, and then automatically returns to a normal state quickly.

MOF is an instrument transformer for measuring electricity usage. Incorporates a meter transformer and a meter current transformer in one place and calculates the exact electricity consumption through the integrated watt-hour meter.

PT is a transformer for meters. In the case of high-voltage power, it can not be directly measured using a voltmeter, so it can be down-converted to low voltage so that it can be indirectly measured and used as voltage for voltmeter, power meter, .

VCB is a vacuum breaker that is used to shut off a high-voltage line by opening and closing a contact in a high-vacuum vessel. It is a circuit breaker with very high dielectric strength by using the arc extinguishing capability in vacuum.

CT is a current transformer for a meter, which can be used as a current for an ammeter, a power meter or the like by modifying a large current to a small current as in the case of a PT.

TR is a transformer with an iron core and a winding, and converts the distribution voltage into an appropriate voltage for the load by an electromagnetic induction action.

ACB is an air circuit breaker, which is a circuit breaker in which the opening and closing operation between contacts of an electric circuit is performed in the atmosphere.

MCCB is a circuit breaker for wiring, which is a low-voltage circuit breaker integrated with an opening / closing mechanism and a trip device in an insulating container. It is a device that automatically cuts off the current when an abnormal state such as an overload or a disconnect occurs manually.

Hereinafter, a configuration of a switchboard according to an embodiment of the present invention is described. Hereinafter, the installation positions and functions of the first to fifth section detection sensors, the first to fifth leakage current sensors, the harmonic current, and the voltage detection sensor included in the switchboard according to one embodiment of the present invention will be described. I will look at it.

<Section detection sensor>

The special pressure section of the switchboard shown in FIG. 1 includes a first section sensor, a second section sensor, a third section sensor, and a fourth section sensor. The first section sensor is formed between the load break switch (LBS) and the extra high voltage cutoff fuse (HPF) to sense the abnormal current. Especially, when the abnormal current is detected by the first section detection sensor, When an abnormality occurs in one of the S phases, the other image mode is tripped to prevent image damage, thereby preventing damage to the load. The second section sensor is connected between the special high voltage cutoff fuse (HPF) and the instrument transformer (MOF) to detect abnormal current. The third section sensor is connected between the MOF and the vacuum breaker . In case the abnormal current is detected in the second and third sections, the circuit breaker (not shown) that can be installed in each section is opened or the line is blocked by various methods to prevent damage to the load. The fourth section sensor is formed between the vacuum breaker (VCB) and the lead of the transformer. If an abnormal current is detected by the fourth section sensor, the vacuum circuit breaker is operated to open the line. In addition, the fourth section sensor transmits the measured voltage and current to the power protection monitoring unit together with the instrument transformer (PT).

The fifth section detection sensor is connected to the output terminal of the air circuit breaker at the low pressure part to sense abnormal current. If an abnormal current is detected, the air circuit breaker is opened to protect the load connected to the output terminal.

<Leakage current sensor>

As shown in FIG. 1, a first leakage current sensor is provided at an input terminal of the lightning arrestor LA installed at an extra-high voltage section of a switchgear. A second leakage current sensor is connected to an input terminal of a ground terminal Respectively. The first leakage current sensor and the second leakage current sensor detect the leakage current due to abnormality of the extra high voltage line, and especially, the second leakage current sensor is connected to the special high voltage semi-enclosure ground for making the ground current in the occurrence of the ground fault It is possible to determine whether or not a ground fault has occurred in the extra high voltage part line through the leakage current amount.

A third leakage current sensor is provided at the ground of the transformer provided in the transformer of the power transmission and distribution panel and a fourth leakage current sensor is provided at the input of the ground terminal provided at the outer surface of the transformer.

Further, a fifth leakage current sensor is provided at an input portion of the ground terminal provided in the enclosure of the low pressure portion of the power transmission / distribution panel.

In general, the grounding terminal installed in the switchgear is installed and maintained in accordance with the standard. In the case of the surge arrester connected to the first leakage current sensor, the grounding type should be the class 1 ground, The thickness of the ground wire is 2.6mm or more. In case of grounding installed in the lightning arrester (LA), it is a path for discharging an abnormal voltage to the ground for protection of electric equipment and lines when an external abnormal voltage such as a lightning strike is intruded. In a normal state where no abnormal voltage is generated, It does not. In addition, the extra-high-voltage enclosure ground, where the second leakage current sensor is installed, performs the function of flowing current to a ground that is installed to the ground without flowing current through a person when a ground fault occurs in the switchboard. The grounding type to be installed is class 1 ground and the ground resistance value should be kept below 10Ω.

A third leakage current sensor of the power distribution unit is connected to the ground of the transformer. The transformer grounding is a type 2 grounding and should maintain a resistance of 150 Ω or less. The thickness of the grounding line to be applied is 2.6 mm when transforming from high pressure to low pressure, and 4.0 mm or more when transforming from special pressure to low pressure. In addition, the distribution ground to which the 4th leakage current sensor is connected is installed to prevent electric shocks of human bodies as in the case of the special high voltage enclosure ground. The grounding type is a class 3 ground, the ground resistance value is 100Ω or less, The thickness is 1.6 mm or less.

The low-pressure enclosure ground to which the fifth leakage current sensor of the low-pressure section is connected is a third-class ground like the enclosure ground of the transformer. The enclosure ground of the extra-high voltage, distribution, and low-voltage parts may be connected to the ground bus bar or the door of each enclosure, but is not limited thereto.

In order to judge whether a constant ground resistance value is maintained for each type (Type 1, Type 2 or Type 3), a transformer is connected in parallel on the ground line as shown in FIG. 4, And displays the ground resistance value calculated in real time through the ground resistance display device included in the display unit so that the manager can know the ground resistance value.

<Harmonic sensor>

Harmonic current refers to a current having a frequency component equivalent to an integer multiple such as 2, 3, or 4 times the fundamental frequency. Harmonic currents are harmonic currents that have a frequency component corresponding to (3n + 1) multiples of the fundamental frequency, such as 4th, 7th, and 10th, depending on the degree relation with the fundamental frequency, Similarly, a reverse harmonic current having a frequency component corresponding to a (3n-1) multiple of the fundamental frequency and an image harmonic current having a frequency component corresponding to a (3n) multiple of the fundamental frequency such as a third, sixth, Loses. The normal harmonic current and the reverse harmonic current are mutually offset by the vector sum because their phases differ by 120 ° and do not affect the power line. However, since the image harmonic currents are the same in phase, a current larger than each phase line current is superposed and flows by a scalar sum, not a vector sum.

If excessive harmonic current flows through the power line, it will cause human injury such as electric shock accident, overheating of the neutral line and lawsuit, frequent malfunction of circuit breaker, increase of voltage distortion of load, communication line noise and interference with load sharing a neutral line Which may cause physical problems such as malfunction of the electrical and electronic equipment.

In order to detect harmonics that may cause a problem on the line, a harmonic current sensor connected to an output terminal of the transformer according to an embodiment of the present invention detects a harmonic current, a harmonic current sensor connected in parallel to an output terminal of the transformer, Install a harmonic voltage sensor to sense the voltage.

As a result, the switchboard according to an embodiment of the present invention may include a first interval sensor to a fifth interval sensor, a first leakage current sensor to a fifth leakage current sensor, a harmonic current sensor, and a harmonic voltage sensor.

In particular, the first to fifth period detection sensors, the first to fifth leakage current sensors, and the fifth harmonic current detection sensor may be a current transformer (CT), and the harmonic voltage detection sensor may be a transformer . Also, in order to calculate the ground resistance value in real time, a transformer (PT) corresponding to a plurality of leakage current sensors connected in parallel with the leads respectively connected to the first to fifth leakage current sensors to the ground and the ground, ).

The configuration and arrangement of the switchboard according to an embodiment of the present invention have been described. Hereinafter, a method of detecting and displaying a line abnormality in a switchboard according to an embodiment of the present invention will be described with reference to FIG. 2 to FIG.

2 is a block diagram of a switchboard according to an embodiment of the present invention.

3 is a functional block diagram of a control unit of a switchboard according to an embodiment of the present invention.

4 is a block diagram of a system connected to a grounding resistance display device of a switchboard according to an embodiment of the present invention.

5 is a front view of an enclosure of a switchboard according to an embodiment of the present invention.

2, the switchboard according to an embodiment of the present invention includes a first interval sensor 111 to a fifth interval sensor 315, a first leakage current sensor 121, Which includes a fifth leakage current sensor 324, a harmonic current sensing sensor 231 and a harmonic voltage sense sensor 232 block and a load break switch (LBS), a vacuum breaker (VCB), and an air block (ACB) And outputs a control signal for controlling the line section 10 to cut off the section or cut off the leakage current and cut off the harmonics and outputs the control signal to the display section 30, And a control unit 20 connected to the network device 40 and the voice alarm device 50. The control unit 20 receives a signal from the control unit 20 and transmits information about abnormality of the power / , And receives a signal from the control unit (20) And a voice alarm device 50 for generating a voice alarm when an abnormality occurs in the power / distribution panel, and includes a display unit 30 for displaying information relating to an abnormal occurrence period of the power / ).

As shown in FIG. 3, the controller 20 includes an analog-to-digital converter (ADC) 21 for converting analog data sensed by the line unit 10 into digital data, A control for controlling the communication network device 40, the voice alarm device 50, and the display unit 30 by receiving data from the ADC 21 to determine whether there is an abnormality in the line unit 10, A user interface device 23 for allowing the administrator of the server 20 to input or modify data related to the switchboard, a reference current and voltage value for each section of the line section 10, A display output module 25 for receiving a control signal from the processor 22 and transferring the control signal to the display unit 25 and a signal for controlling the line unit 10 from the processor 22, Distribution to be delivered A control signal output module 26.

For example, the control unit 20 detects the data of the interval detection sensor CT installed in each section in real time.

The ADC 21 converts the analog current signal input from the first section detection sensor to a digital signal, and the processor 22 compares the analog current signal with the reference current value of the first section stored in the memory 24, . When it is detected that an abnormal current flows in the first section detection sensor, that is, when the processor 22 detects an abnormal current in the first section, the load switch LBS is opened to block the abnormal current delivered to the load And transmits a signal to the line section 10 through the switchboard control signal output module 26. Further, in order to notify that an abnormality occurs in the first section through the display unit 30, the display output module 25 operates to change the color of the lamp of the first section or to display it on the monitor. In particular, the load break switch (LBS) cuts off the other phase currents in order to prevent image formation even when an abnormality occurs in one phase current.

The processor 22 of the control unit 20 determines an abnormal current occurring in each section and transmits a shutoff signal to the line unit 10 and a signal indicating the occurrence of an abnormality to the display unit 30, And performs a voice alarm or a signal transmission function to the administrator terminal via the network.

4, the control unit 20 calculates a ground resistance value in real time using a leakage current sensor and a transformer installed at the ground terminal, and outputs the ground resistance value in real time through the ground resistance display device 32 included in the display unit. Displays the ground resistance value. The indication of the grounding resistance through the grounding resistance display (32) includes the grounding resistance of the lightning arrester (LA) installed in the special high voltage unit, the grounding resistance of the special high voltage enclosure, the grounding resistance of the transformer, Both of the grounding resistances of the grounding resistors can be displayed in real time. The control unit compares the ground resistance value of each grounding resistance with the grounding type reference grounding resistance value stored in the memory 24, immediately disconnects the line when the difference occurs or exceeds the critical resistance value, Or to change the color of the light emitted from the ground terminal where an error occurs.

As shown in FIG. 5, the display unit 30 may be a monitor installed on an outer surface of the cabinet, and an LED lamp may be provided for each section to change the color of the LED lamp in the section where the abnormality occurs, To be able to recognize. That is, when an abnormality occurs in the first section as in the previous example, the color of the LED lamp installed at the lower end of the load switch (LBS) is changed as shown in FIG. The administrator can confirm the change of the lighting color of the LED lamp and check the line near the load break switch (LBS) of the special high voltage class to repair the fault section.

Further, the control unit 20 of the present invention protects the load side by operating the circuit breaker when an abnormality occurs in the line, and when the abnormal current or the abnormal situation in the line is eliminated, the circuit breaker is operated again to return the power / .

As a result, the switchboard according to an embodiment of the present invention can easily check whether or not an abnormality has occurred through the sensors installed in the respective sections on the line, in real time, and to indicate whether or not each section is installed in the enclosure of the switchboard And a display unit or a display unit so as to easily recognize a section requiring recovery at the time of restoration of the power and control panel due to an abnormality.

10 Line section 20 Control section
21 ADC 22 Processor
23 User Interface 24 Memory
25 Display Output Module 26 Switching Module Control Signal Output Module
30 Display part 32 Ground resistance display
40 Communication network device 50 Voice alarm device
100 Special high voltage part 111 1st section detection sensor
112 Second section detection sensor 113 Third section detection sensor
114 Fourth section detection sensor 121 First leakage current sensor
122 Second Leakage Current Sensor 200 Transformer
223 Third Leakage Current Sensor 224 Fourth Leakage Current Sensor
231 Harmonic current sensor 232 Harmonic voltage sensor
300 Low pressure section 315 Fifth section detection sensor
324 Fifth Leakage Current Sensor

Claims (7)

In a power transmission and reception system that receives power from a power supplier and converts a high-voltage power to a low voltage and supplies the converted low-voltage power to a consumer,
The switchboard includes an extra-high voltage section, a transforming section, a low-voltage section, a control section, and a display section,
The automatic high-voltage switch includes an automatic load switching switch (ALTS) for securing a dual power source from a power supply source and automatically switching to a standby power supply when an abnormality occurs, a load switch (LBS) connected to the output terminal of the automatic load switching switch, (LA) connected to the output terminal of the automatic load changeover switch in parallel for discharging an abnormal current to the ground, an extra high voltage disconnecting fuse (HPF) connected to the output terminal of the load switch, an output terminal of the extra high voltage disconnecting fuse And a vacuum interrupter (VCB) connected to an output terminal of the instrumental transformer (MOF) for performing shutoff of the high-voltage line by opening and closing a contact in a high-vacuum container, A first section detection sensor formed between the load break switch LBS and the extra high voltage portion cutoff fuse to detect an abnormal current, A second interval detection sensor formed between the HPF and the MOF for detecting an abnormal current and a second interval detection sensor formed between the instrumental MOF and the vacuum breaker VCB for detecting an abnormal current, And a fourth interval detection sensor formed between the vacuum breaker (VCB) and the lead line of the transforming unit for detecting an abnormal current, wherein the fourth interval detection sensor is disposed at an input terminal of the lightning arrestor (LA) And a second leakage current sensor connected to the leakage current sensor, the ground bus bar or the door of the special high voltage insulation enclosure for detecting a leakage current leaking through the special high voltage insulation box,
Wherein the transformer comprises a transformer for converting high voltage power to low voltage and includes a third leakage current sensor coupled to the transformer and connected to the ground bus bar or the door of the transformer enclosure to provide leakage current leakage through the transformer enclosure A harmonic current sensor connected to an output terminal of the transformer to detect a harmonic current, and a harmonic voltage sensor connected in parallel to an output terminal of the transformer to sense a harmonic voltage,
The low-pressure section includes an air circuit breaker (ACB), which is a circuit breaker that is opened and closed between contacts of an electric circuit, a power factor improving capacitor connected in parallel with an output terminal of the air circuit breaker (ACB) And a fifth interval detection sensor connected to the output terminal of the instrumental current transformer for detecting an abnormal current and connected to the ground bus bar or the door of the low voltage section enclosure, And a fifth leakage current sensor for detecting a leakage current that is leaked,
The control unit is connected to the output terminals of the first to fifth period detection sensors, the first leakage current sensor to the fifth leakage current sensor, the harmonic current detection sensor, and the harmonic voltage detection sensor, And an AD converter for converting the sensed data of the sensor into a digital signal and determining whether or not there is an abnormality in the sensing data of the sensors and displaying the sensed data on the display unit.
The method according to claim 1,
Wherein the first section detection sensor to the fifth section detection sensor is a changeover system (CT).
The method according to claim 1,
Wherein the first leakage current sensor to the fifth leakage current sensor are changeable systems and the switchgear is connected in parallel with a lead wire connected to each of the first leakage current sensor to the fifth leakage current sensor, Further comprising a transformer (PT) corresponding to a plurality of leakage current sensors for measuring a voltage.
The method of claim 3,
The display unit may be configured to detect whether or not a current abnormality is sensed by the first to fifth sensing units, whether an abnormal leakage current is sensed by the first to fifth leakage current sensors, And a plurality of light sources for visually determining presence or absence of an abnormal harmonic wave sensed by the harmonic voltage detection sensor, wherein current data of the first to fifth leakage current sensors and a plurality of leakage currents And a ground resistance display unit for displaying a ground resistance value calculated by the control unit through voltage data of a transformer (PT) connected in parallel corresponding to the sensor.
The method according to claim 1,
Further comprising a voice alarm device connected to the control unit and generating a sound alarm when an abnormality occurs in the switchboard.
The method according to claim 1,
Further comprising a communication network device connected to the control unit and transmitting an abnormal signal to the terminal of the manager when an abnormality occurs in the switchboard.
The method according to claim 1,
The controller includes a processor for comparing the sensed data input from the AD converter with stored reference data to determine an abnormality and controlling the circuit breaker on the line;
A memory coupled to the processor for storing reference data input from an external user;
A display output module connected to the processor and outputting a signal for controlling the display unit;
A step-down control signal output module connected to the processor for outputting a power cut-off signal of a section or a ground terminal in which an abnormality occurs; And
Wherein the external user includes a user interface for inputting data.

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