CN110082653B - Partial discharge on-line monitoring system and device - Google Patents
Partial discharge on-line monitoring system and device Download PDFInfo
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- CN110082653B CN110082653B CN201910381129.4A CN201910381129A CN110082653B CN 110082653 B CN110082653 B CN 110082653B CN 201910381129 A CN201910381129 A CN 201910381129A CN 110082653 B CN110082653 B CN 110082653B
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
本发明公开了一种局部放电在线监测系统以及设备。其中，所述系统包括：供电电源、超声波传感器组、硬件开关整复电压电路、单芯片电路和通讯电路，该供电电源供电，该超声波传感器组侦测电网中电力设施的超声波波源，根据该侦测到的超声波波源，监测预设带宽范围内的预设值的超声波波源，滤除该预设带宽范围内的预设值的外的超声波波源，让该监测的超声波波源对应的超声波波形使超声波传感器产生开与关的状态，该硬件开关整复电压电路将该产生的开与关的状态信号转换成电信号，该单芯片电路将该转换成的电信号馈入单片机内，该通讯电路将该馈入的电信号传输到后台。通过上述方式，能够实现对电网中电力设施在任意情形下的局部放电的在线监测。
The invention discloses a partial discharge online monitoring system and equipment. Wherein, the system includes: a power supply, an ultrasonic sensor group, a hardware switch reset voltage circuit, a single-chip circuit and a communication circuit, the power supply supplies power, and the ultrasonic sensor group detects the ultrasonic wave source of the power facilities in the power grid, according to the detection The detected ultrasonic wave source, monitor the ultrasonic wave source with the preset value within the preset bandwidth range, filter out the ultrasonic wave source outside the preset value within the preset bandwidth range, and let the ultrasonic waveform corresponding to the monitored ultrasonic wave source make the ultrasonic wave. The sensor generates on and off states, the hardware switch resets the voltage circuit and converts the generated on and off state signals into electrical signals, the single-chip circuit feeds the converted electrical signals into the single-chip microcomputer, and the communication circuit will This fed electrical signal is transmitted to the background. Through the above method, it is possible to realize the online monitoring of the partial discharge of the power facilities in the power grid under any circumstances.
Description
Technical Field
The invention relates to the technical field of electric power facilities, in particular to a partial discharge online monitoring system and a partial discharge online monitoring device.
Background
The electric power facilities in the power grid include high-voltage circuit breakers or switches, high-voltage buses, high-voltage cable connectors, low-voltage high-current switches, low-voltage buses, transformers, etc., and these facilities are generally formed by connectors or windings, all of which are insulated by insulating layers such as insulating paint, air, etc., so that the complete conduction is maintained under the conditions of fixed and varying loads, the current flows through the set path completely without leakage, and no partial discharge occurs at this time. If the load is fixed or varied due to deterioration of insulation or incomplete contact, the current cannot flow through the set path completely, and leakage occurs to cause arcing, which is called partial discharge or partial discharge. The partial discharge causes abnormal temperature rise of the electric power facilities due to the generation of the arc and generates ultrasonic waves, thereby shortening the life of the electric power facilities in the power grid and even causing the failure of the electric power facilities in the power grid.
The partial discharge time is short, the energy is small, but the partial discharge has great harmfulness, the long-term existence of the partial discharge can generate great damage to the insulating material, firstly, the insulating material adjacent to the partial discharge is damaged by the direct bombardment of discharge particles to cause the partial insulation, and secondly, the partial insulation is corroded and aged by the chemical action of active gases such as heat, ozone, nitrogen oxide and the like generated by the discharge, the electrical conductivity is increased, and the thermal breakdown is finally caused. For example, in a transformer in operation, the deterioration and destruction of internal insulation often starts from partial discharge.
The existing monitoring scheme of partial discharge generally adopts an ultrasonic monitoring mode to monitor sound waves appearing in partial discharge, converts the sound waves appearing in the monitored partial discharge into electric signals, records the electric signals on a magnetic tape for analysis, utilizes the transmission time difference of the electric signals and the sound signals to obtain the distance from a detection point to the partial discharge point, and adopts a sound amplification function and a DB (Decibel ) value to distinguish the difference of the partial discharge, so that the initial partial discharge and the partial discharge of a closed switch can not be monitored.
However, the inventors found that at least the following problems exist in the prior art:
the existing partial discharge monitoring scheme generally adopts an ultrasonic monitoring mode, and adopts a sound amplification function and utilizes a DB (DeciBel) value to distinguish the partial discharge of the power facility in the power grid, so that the initial partial discharge of the power facility in the power grid and the partial discharge of a closed switch can not be monitored.
Disclosure of Invention
In view of the above, the present invention provides an online partial discharge monitoring system and an online partial discharge monitoring device, which can perform online partial discharge monitoring of an electric power facility in an electric power grid under any condition.
According to an aspect of the present invention, there is provided an online partial discharge monitoring system, including:
the ultrasonic sensor group comprises a power supply, an ultrasonic sensor group, a hardware switch reset voltage circuit, a single chip circuit and a communication circuit;
the power supply is respectively connected with the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit, the hardware switch reset voltage circuit is respectively connected with the power supply, the ultrasonic sensor group and the single chip circuit, and the single chip circuit is respectively connected with the power supply, the hardware switch reset voltage circuit and the communication circuit;
the power supply is used for respectively supplying power to the ultrasonic sensor group, the hardware switch restoration voltage circuit, the single chip circuit and the communication circuit;
the ultrasonic sensor group is used for detecting an ultrasonic wave source of an electric power facility in a power grid, monitoring an ultrasonic wave source with a preset value within a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the power grid, filtering the ultrasonic wave source outside the preset value within the preset bandwidth range, and enabling an ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value within the monitored preset bandwidth range to enable the ultrasonic sensor to generate an on-off state;
the hardware switch restoration voltage circuit is used for converting on and off state signals generated by the ultrasonic sensor into electric signals; the electric signal is used as a partial discharge judgment standard and a judgment standard of the partial discharge severity of the electric power facility in the power grid;
the single chip circuit is used for feeding the converted electric signals into a single chip;
and the communication circuit is used for transmitting the electric signal fed into the singlechip to a background.
Wherein, the power supply includes:
the power supply, the resonance circuit, the voltage reduction circuit and the voltage stabilizing circuit;
the resonance circuit is connected with the power supply and the voltage reduction circuit respectively, and the voltage reduction circuit is connected with the resonance circuit and the voltage stabilizing circuit respectively;
the power supply is used for providing power supply electric energy;
the resonance circuit is used for filtering the provided power supply electric energy;
the voltage reduction circuit is used for reducing the voltage of the filtered power supply electric energy;
and the voltage stabilizing circuit is used for stabilizing the voltage of the power supply electric energy after voltage reduction into stable power supply electric energy.
Wherein the power supply is a direct current power supply.
Wherein, ultrasonic sensor group includes:
at least two ultrasonic sensors;
each two ultrasonic sensors of the at least two ultrasonic sensors are connected in parallel;
each ultrasonic sensor of the at least two ultrasonic sensors is used for detecting an ultrasonic wave source of an electric power facility in an electric network, monitoring the ultrasonic wave source of a preset value within a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the electric network, filtering the ultrasonic wave source outside the preset value within the preset bandwidth range, and enabling an ultrasonic wave waveform corresponding to the ultrasonic wave source of the preset value within the monitored preset bandwidth range to enable the corresponding ultrasonic sensor to generate an on-off state.
Wherein the single chip circuit comprises:
the local discharge circuit comprises a local discharge circuit address setting circuit and a single-chip microcomputer;
the local discharge circuit address setting circuit is connected with the single-chip microcomputer;
the local discharge circuit address setting circuit is used for setting a discharge address of local discharge corresponding to the converted electric signal and feeding the electric signal with the discharge address set into the single chip microcomputer;
the single-chip microcomputer is used for carrying out all signal input, judgment, classification and output functions according to the fed-in electric signals, and judging the partial discharge and the partial discharge severity of the electric power facilities in the power grid by utilizing big data matched with Fourier transformation and utilizing a model identification mode.
Wherein, partial discharge on-line monitoring system still includes:
a display;
the display is connected with the power supply and the single chip circuit respectively;
the display is used for displaying on-off state information related to the electric signal information according to the fed-in electric signal information;
the power supply is also used for supplying power to the display when the display needs to display the on and off state information associated with the electric signal information, and does not supply power to the display when the display does not need to display the on and off state information associated with the electric signal information.
Wherein, partial discharge on-line monitoring system still includes:
a background;
the background is in wired or wireless connection with the communication circuit;
and the background is used for receiving the transmitted electric signals and analyzing the curve of the partial discharge condition of the electric power facility in the power grid according to the received electric signals.
According to another aspect of the present invention, there is provided a partial discharge online monitoring device, comprising the partial discharge online monitoring system as described in any one of the above.
It can be found that, according to the above scheme, the partial discharge on-line monitoring system may include a power supply, an ultrasonic sensor group, a hardware switch reset voltage circuit, a single chip circuit and a communication circuit, where the power supply is connected to the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit respectively, the hardware switch reset voltage circuit is connected to the power supply, the ultrasonic sensor group and the single chip circuit respectively, the single chip circuit is connected to the power supply, the hardware switch reset voltage circuit and the communication circuit respectively, the power supply can supply power to the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit respectively, the ultrasonic sensor group can detect an ultrasonic source of a power facility in a power grid, and according to the detected ultrasonic source of the power facility in the power grid, monitoring an ultrasonic wave source with a preset value in a preset bandwidth range, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, enabling an ultrasonic sensor to generate an on-off state by an ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value in the monitored preset bandwidth range, and converting an on-off state signal generated by the ultrasonic sensor into an electric signal by the hardware switch reset voltage circuit; the single chip circuit can feed the converted electric signal into the single chip microcomputer, and the communication circuit can transmit the electric signal fed into the single chip microcomputer to a background, so that the on-line monitoring of the partial discharge of the electric facility in the power grid under any condition can be realized.
Further, above scheme, this power supply can include the power, resonance circuit, step-down circuit and voltage stabilizing circuit, this resonance circuit is connected respectively with this power and this step-down circuit, this step-down circuit is connected respectively with this resonance circuit and this voltage stabilizing circuit, this power can provide the power supply electric energy, this resonance circuit can filter this power supply electric energy who provides, this step-down circuit can step down this filtered power supply electric energy, this voltage stabilizing circuit can become stable power supply electric energy with this power supply electric energy steady voltage after stepping down, such advantage can ensure that the voltage value of power supply electric energy can not change under the condition that the load has the change.
Further, according to the above scheme, the power supply may be a dc power supply, which has the advantage of being able to realize the advantage of ensuring that the voltage value of the power supply cannot change when the load changes.
Further, in the above solution, the ultrasonic sensor set may include at least two ultrasonic sensors, every two ultrasonic sensors of the at least two ultrasonic sensors are connected in parallel, each ultrasonic sensor of the at least two ultrasonic sensors can detect an ultrasonic wave source of an electric facility in the electric network, monitoring the ultrasonic wave source with a preset value in a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the power grid, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, and enabling the ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value in the monitored preset bandwidth range to enable the corresponding ultrasonic sensor to generate an on-off state, the method has the advantages that the accuracy of monitoring the ultrasonic wave source with the preset value in the preset bandwidth range can be improved, and the accuracy of filtering the ultrasonic wave source outside the preset value in the preset bandwidth range can be improved.
Further, according to the above scheme, the single chip circuit may include: the local discharge circuit address setting circuit is connected with the single-chip microcomputer; the local discharge circuit address setting circuit can set a discharge address of local discharge corresponding to the converted electric signal, and feed the electric signal with the discharge address into the single-chip microcomputer, the single-chip microcomputer can be used for carrying out all signal input, judgment, classification and output functions according to the fed-in electric signal, conversion such as big data matched with Fourier and the like is utilized, and the local discharge severity of the electric power facility in the electric network are judged by utilizing a model identification mode, so that the local discharge and the local discharge severity of the electric power facility in the electric network can be judged.
Furthermore, according to the above scheme, the partial discharge online monitoring system further comprises a display, the display is connected with the power supply and the single chip circuit respectively, the display can display the on-off state information associated with the electrical signal information according to the fed-in electrical signal information, the power supply can supply power to the display when the display needs to display the on-off state information associated with the electrical signal information, and the display does not supply power when the display does not need to display the on-off state information associated with the electrical signal information Maintenance or even replacement of equipment can avoid the occurrence of large-scale power failure due to incapability of electric power facilities.
Furthermore, according to the above scheme, the partial discharge online monitoring system may further include a background, the background is connected to the communication circuit in a wired or wireless manner, the background may receive the transmitted electrical signal, and analyze a curve of a partial discharge condition of the power facility in the power grid according to the received electrical signal, which may achieve the advantages of analyzing the curve of the partial discharge condition of the power facility in the power grid, determining the severity of the partial discharge of the power facility in the power grid according to the analyzed curve of the partial discharge condition of the power facility in the power grid, and prompting a worker managing the power facility in the power grid to maintain, repair or even replace the device for the corresponding power facility, thereby avoiding occurrence of a large-scale power outage due to incapability of the power facility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an online partial discharge monitoring system according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of the partial discharge online monitoring system according to the present invention;
fig. 3 is a schematic structural diagram of a partial discharge online monitoring system according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Similarly, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The invention provides an online partial discharge monitoring system which can realize online partial discharge monitoring of electric power facilities in a power grid under any condition.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an online partial discharge monitoring system according to the present invention. The partial discharge online monitoring system 10 comprises a power supply 11, an ultrasonic sensor group 12, a hardware switch reset voltage circuit 13, a single chip circuit 14 and a communication circuit 15.
The power supply 11 is connected to the ultrasonic sensor set 12, the hardware switch reset voltage circuit 13, the single chip circuit 14 and the communication circuit 15, respectively.
The hardware switch reset voltage circuit 13 is connected to the power supply 11, the ultrasonic sensor set 12 and the single chip circuit 14, respectively.
The single chip circuit 14 is connected to the power supply 11, the hardware switch reset voltage circuit 13 and the communication circuit 15, respectively.
The power supply 11 is configured to supply power to the ultrasonic sensor set 12, the hardware switch reset voltage circuit 13, the single chip circuit 14, and the communication circuit 15, respectively.
The ultrasonic sensor group 12 is configured to detect an ultrasonic wave source of an electric power facility in a power grid, monitor an ultrasonic wave source of a preset value within a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the power grid, filter an ultrasonic wave source outside the preset value within the preset bandwidth range, and enable an ultrasonic wave waveform corresponding to the ultrasonic wave source of the preset value within the monitored preset bandwidth range to enable the ultrasonic sensor to generate an ON (ON) state and an OFF (OFF) state.
The hardware switch reset voltage circuit 13 is used for converting on and off state signals generated by the ultrasonic sensor into electric signals; the electric signal is used as a partial discharge judgment standard and a judgment standard of the partial discharge severity of the power facility in the power grid.
The single chip circuit 14 is used for feeding the converted electrical signal into a single chip.
The communication circuit 15 is used for transmitting the electric signal fed into the singlechip to the background.
Alternatively, the power supply 11 may include:
a power supply (not shown), a resonant circuit (not shown), a voltage reduction circuit (not shown), and a voltage regulation circuit (not shown);
the resonance circuit is respectively connected with the power supply and the voltage reduction circuit, and the voltage reduction circuit is respectively connected with the resonance circuit and the voltage stabilizing circuit;
the power supply is used for supplying power supply electric energy;
the resonance circuit is used for filtering the supplied power supply electric energy;
the voltage reduction circuit is used for reducing the voltage of the filtered power supply electric energy;
the voltage stabilizing circuit is used for stabilizing the voltage of the power supply electric energy after voltage reduction into stable power supply electric energy, and has the advantage of ensuring that the voltage value of the power supply electric energy cannot change under the condition that the load changes.
Alternatively, the power supply may be a dc power supply, which is advantageous in that it is possible to ensure that the voltage value of the power supply does not change in the case of a change in the load.
Alternatively, the ultrasonic sensor group 12 may include:
at least two ultrasonic sensors (not shown);
each two ultrasonic sensors of the at least two ultrasonic sensors are connected in parallel;
each ultrasonic sensor of the at least two ultrasonic sensors is used for detecting an ultrasonic wave source of an electric power facility in an electric network, monitoring the ultrasonic wave source of a preset value in a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the electric network, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, and enabling the ultrasonic wave waveform corresponding to the ultrasonic wave source of the preset value in the monitored preset bandwidth range to enable the corresponding ultrasonic sensor to generate an on-off state.
Optionally, the single chip circuit 14 may include:
a local discharge circuit address setting circuit (not marked in the figure) and a single chip microcomputer (not marked in the figure);
the local discharge circuit address setting circuit is connected with the single-chip microcomputer;
the local discharge circuit address setting circuit is used for setting a discharge address of local discharge corresponding to the converted electric signal and feeding the electric signal with the discharge address set into the single chip microcomputer;
the single-chip microcomputer is used for carrying out all signal input, judgment, classification and output functions according to the fed-in electric signal, converting by utilizing big data matched with Fourier and the like, and judging the partial discharge and the partial discharge severity of the electric facility in the electric network by utilizing a model identification mode, so that the partial discharge and the partial discharge severity of the electric facility in the electric network can be judged.
In this embodiment, the power can be supplied by the DC (Direct Current) 12V (volt) power supply, filtered by the resonant circuit, and then stepped down by the step-down circuit, and the stepped-down power supply is stabilized to be a stable DC 5V power supply, which is enough for the supply voltage value not to change under any change.
In this embodiment, the ultrasonic sensor set 12 can detect 10kHZ to 50kHZ ultrasonic sources, and the rest of ultrasonic waveforms other than this bandwidth are filtered out, so that the ultrasonic waveforms with the bandwidth in the detection range cause the ultrasonic sensor to generate ON and OFF states.
In the present embodiment, since the ultrasonic frequency is 10kHZ to 50kHZ and the switch takes several seconds or tens of milliseconds, the ultrasonic speed is fast, so that the switch is in four states of full ON (ON), full OFF (OFF), Half ON (Half ON) and Half OFF (Half OFF).
For a period of time, the ultrasonic sensor is turned ON fully (ON) for more than 80% of the time. For a period of time, the ultrasonic sensor is turned ON Half ON (Half ON) for 80% -50% of the time. For a period of time, 50% -20% of the time the ultrasonic sensor is turned on is Half OFF (Half OFF). For a period of time, the ultrasonic sensor is turned on fully OFF (OFF) for 20% or less of the time.
In this embodiment, the hardware switch reset voltage circuit 13 can convert the ON and OFF states of the ultrasonic sensor into electrical signals through the design of the switch reset voltage circuit and the design of the operational amplifier, and the continuous switch forms a waveform with voltage varying with time according to the waveform principle and angle, which is not limited in the present invention.
In the present embodiment, there are many facilities in the unmanned electric room automation for testing various parameters, each of the measured electricity must maintain uniqueness in order to represent the measured parameter of a certain electric room facility, the address setting circuit can be formed into eight-bit binary from J8 and J9, and the addresses are 128 addresses from 0-127.
In this embodiment, the single-chip microcomputer can be responsible for all signal input, discrimination, classification and output functions. The method has a program main body, can utilize big data to be matched with Fourier transformation and the like, judges the partial discharge value by utilizing a model identification skill, can calculate the severity of the partial discharge, and greatly reduces the probability of errors possibly caused by hardware composition. The program software can be recorded into a single-chip microcomputer ROMRead-Only Memory and a read-Only Memory, and can not be changed, and the recording times can reach dozens of thousands of times. Under the condition that hardware is kept unchanged, software can make the partial discharge judgment more flexible. Through the comparison of environmental values and the comparison of numerical values of an Analog to Digital converter (A/D) of a single chip microcomputer, the occurrence of partial discharge is judged, the severity of the partial discharge can be judged, the numerical values are transmitted to a background and are also displayed on a display, and field personnel can see the numerical values at a glance.
In this embodiment, a single-chip microcomputer serial port to RS485 protocol may be used as the communication protocol.
In this embodiment, the communication channel of the communication circuit 15 can be divided into wired and wireless communication, and the transmission only uses transmission packets, only uses channel transmission data, and then uses RS485 protocol for interpretation. The communication channel is wired communication and the like, the communication channel is wireless communication and has mobile phone channel transmission and the like, and the transmission can be centralized and then transmitted uniformly by a data collector on line.
It can be found that, in this embodiment, the partial discharge online monitoring system may include a power supply, an ultrasonic sensor group, a hardware switch reset voltage circuit, a single chip circuit and a communication circuit, where the power supply is connected to the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit respectively, the hardware switch reset voltage circuit is connected to the power supply, the ultrasonic sensor group and the single chip circuit respectively, the single chip circuit is connected to the power supply, the hardware switch reset voltage circuit and the communication circuit respectively, the power supply can supply power to the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit respectively, the ultrasonic sensor group can detect an ultrasonic source of a power facility in a power grid, and according to the detected ultrasonic source of the power facility in the power grid, monitoring an ultrasonic wave source with a preset value in a preset bandwidth range, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, enabling an ultrasonic sensor to generate an on-off state by an ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value in the monitored preset bandwidth range, and converting an on-off state signal generated by the ultrasonic sensor into an electric signal by the hardware switch reset voltage circuit; the single chip circuit can feed the converted electric signal into the single chip microcomputer, and the communication circuit can transmit the electric signal fed into the single chip microcomputer to a background, so that the on-line monitoring of the partial discharge of the electric facility in the power grid under any condition can be realized.
Further, in this embodiment, the power supply may include a power supply, a resonant circuit, a voltage-reducing circuit and a voltage-stabilizing circuit, the resonant circuit is connected to the power supply and the voltage-reducing circuit, the voltage-reducing circuit is connected to the resonant circuit and the voltage-stabilizing circuit, the power supply may provide the power supply, the resonant circuit may filter the provided power supply, the voltage-reducing circuit may reduce the filtered power supply, the voltage-stabilizing circuit may stabilize the voltage of the reduced power supply into a stable power supply, and this is advantageous in that it may be ensured that the voltage value of the power supply may not change when the load has a change.
Further, in this embodiment, the power supply may be a dc power supply, which is advantageous in that it is convenient to ensure that the voltage value of the power supply does not change when the load changes.
Further, in this embodiment, the ultrasonic sensor set may include at least two ultrasonic sensors, every two ultrasonic sensors of the at least two ultrasonic sensors are connected in parallel, each ultrasonic sensor of the at least two ultrasonic sensors can detect an ultrasonic wave source of an electric facility in the electric network, monitoring the ultrasonic wave source with a preset value in a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the power grid, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, and enabling the ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value in the monitored preset bandwidth range to enable the corresponding ultrasonic sensor to generate an on-off state, the method has the advantages that the accuracy of monitoring the ultrasonic wave source with the preset value in the preset bandwidth range can be improved, and the accuracy of filtering the ultrasonic wave source outside the preset value in the preset bandwidth range can be improved.
Further, in this embodiment, the single chip circuit may include: the local discharge circuit address setting circuit is connected with the single-chip microcomputer; the local discharge circuit address setting circuit can set a discharge address of local discharge corresponding to the converted electric signal, and feed the electric signal with the discharge address into the single-chip microcomputer, the single-chip microcomputer can be used for carrying out all signal input, judgment, classification and output functions according to the fed-in electric signal, conversion such as big data matched with Fourier and the like is utilized, and the local discharge severity of the electric power facility in the electric network are judged by utilizing a model identification mode, so that the local discharge and the local discharge severity of the electric power facility in the electric network can be judged.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of the partial discharge online monitoring system according to the present invention. Different from the previous embodiment, the partial discharge online monitoring system 20 according to the present embodiment further includes: a display 21.
The display 21 is connected to the power supply 11 and the single chip circuit 14.
The display 21 is used for displaying on and off status information associated with the fed electrical signal information according to the electrical signal information.
The power supply 11 is further configured to supply power to the display 21 when the display 21 needs to display the on/off status information associated with the electrical signal information, and not supply power to the display 21 when the display 21 does not need to display the on/off status information associated with the electrical signal information.
It can be found that, in this embodiment, the partial discharge online monitoring system further includes a display, the display is connected to the power supply and the single chip circuit, the display can display the on-off status information associated with the electrical signal information according to the fed electrical signal information, the power supply can supply power to the display when the display needs to display the on-off status information associated with the electrical signal information, and the display does not need to supply power to the display when the display does not need to display the on-off status information associated with the electrical signal information Maintenance or even replacement of equipment can avoid the occurrence of large-scale power failure due to incapability of electric power facilities.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a partial discharge online monitoring system according to another embodiment of the present invention. Different from the previous embodiment, the partial discharge online monitoring system 30 according to the present embodiment further includes: a background 31.
The background 31 is connected to the communication circuit 15 by wire or wirelessly.
The background is used for receiving the transmitted electric signal and analyzing the curve of the partial discharge condition of the electric facility in the power grid according to the received electric signal.
It can be found that, in this embodiment, the partial discharge online monitoring system may further include a background, the background is connected to the communication circuit in a wired or wireless manner, and the background may receive the transmitted electrical signal and analyze a curve of a partial discharge condition of the power facility in the power grid according to the received electrical signal, which has the advantages of being able to analyze the curve of the partial discharge condition of the power facility in the power grid, being able to determine a severity of the partial discharge of the power facility in the power grid according to the analyzed curve of the partial discharge condition of the power facility in the power grid and prompting a worker managing the power facility in the power grid to maintain, repair or even replace the device for the corresponding power facility, and being able to avoid a large-scale power outage due to the incapability of the power facility.
The present invention further provides an online partial discharge monitoring device, which includes an online partial discharge monitoring system, where the online partial discharge monitoring system is the online partial discharge monitoring system in the above embodiment, and each functional module of the online partial discharge monitoring system can respectively perform the function, connection relationship, and the like of each functional module of the online partial discharge monitoring system corresponding to the above embodiment, so that the functional modules of the online partial discharge monitoring system are not described herein again, and please refer to the corresponding description above in detail.
It can be found that, according to the above scheme, the partial discharge on-line monitoring system may include a power supply, an ultrasonic sensor group, a hardware switch reset voltage circuit, a single chip circuit and a communication circuit, where the power supply is connected to the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit respectively, the hardware switch reset voltage circuit is connected to the power supply, the ultrasonic sensor group and the single chip circuit respectively, the single chip circuit is connected to the power supply, the hardware switch reset voltage circuit and the communication circuit respectively, the power supply can supply power to the ultrasonic sensor group, the hardware switch reset voltage circuit, the single chip circuit and the communication circuit respectively, the ultrasonic sensor group can detect an ultrasonic source of a power facility in a power grid, and according to the detected ultrasonic source of the power facility in the power grid, monitoring an ultrasonic wave source with a preset value in a preset bandwidth range, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, enabling an ultrasonic sensor to generate an on-off state by an ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value in the monitored preset bandwidth range, and converting an on-off state signal generated by the ultrasonic sensor into an electric signal by the hardware switch reset voltage circuit; the single chip circuit can feed the converted electric signal into the single chip microcomputer, and the communication circuit can transmit the electric signal fed into the single chip microcomputer to a background, so that the on-line monitoring of the partial discharge of the electric facility in the power grid under any condition can be realized.
Further, above scheme, this power supply can include the power, resonance circuit, step-down circuit and voltage stabilizing circuit, this resonance circuit is connected respectively with this power and this step-down circuit, this step-down circuit is connected respectively with this resonance circuit and this voltage stabilizing circuit, this power can provide the power supply electric energy, this resonance circuit can filter this power supply electric energy who provides, this step-down circuit can step down this filtered power supply electric energy, this voltage stabilizing circuit can become stable power supply electric energy with this power supply electric energy steady voltage after stepping down, such advantage can ensure that the voltage value of power supply electric energy can not change under the condition that the load has the change.
Further, according to the above scheme, the power supply may be a dc power supply, which has the advantage of being able to realize the advantage of ensuring that the voltage value of the power supply cannot change when the load changes.
Further, in the above solution, the ultrasonic sensor set may include at least two ultrasonic sensors, every two ultrasonic sensors of the at least two ultrasonic sensors are connected in parallel, each ultrasonic sensor of the at least two ultrasonic sensors can detect an ultrasonic wave source of an electric facility in the electric network, monitoring the ultrasonic wave source with a preset value in a preset bandwidth range according to the detected ultrasonic wave source of the electric power facility in the power grid, filtering the ultrasonic wave source outside the preset value in the preset bandwidth range, and enabling the ultrasonic wave waveform corresponding to the ultrasonic wave source with the preset value in the monitored preset bandwidth range to enable the corresponding ultrasonic sensor to generate an on-off state, the method has the advantages that the accuracy of monitoring the ultrasonic wave source with the preset value in the preset bandwidth range can be improved, and the accuracy of filtering the ultrasonic wave source outside the preset value in the preset bandwidth range can be improved.
Further, according to the above scheme, the single chip circuit may include: the local discharge circuit address setting circuit is connected with the single-chip microcomputer; the local discharge circuit address setting circuit can set a discharge address of local discharge corresponding to the converted electric signal, and feed the electric signal with the discharge address into the single-chip microcomputer, the single-chip microcomputer can be used for carrying out all signal input, judgment, classification and output functions according to the fed-in electric signal, conversion such as big data matched with Fourier and the like is utilized, and the local discharge severity of the electric power facility in the electric network are judged by utilizing a model identification mode, so that the local discharge and the local discharge severity of the electric power facility in the electric network can be judged.
Furthermore, according to the above scheme, the partial discharge online monitoring system further comprises a display, the display is connected with the power supply and the single chip circuit respectively, the display can display the on-off state information associated with the electrical signal information according to the fed-in electrical signal information, the power supply can supply power to the display when the display needs to display the on-off state information associated with the electrical signal information, and the display does not supply power when the display does not need to display the on-off state information associated with the electrical signal information Maintenance or even replacement of equipment can avoid the occurrence of large-scale power failure due to incapability of electric power facilities.
Furthermore, according to the above scheme, the partial discharge online monitoring system may further include a background, the background is connected to the communication circuit in a wired or wireless manner, the background may receive the transmitted electrical signal, and analyze a curve of a partial discharge condition of the power facility in the power grid according to the received electrical signal, which may achieve the advantages of analyzing the curve of the partial discharge condition of the power facility in the power grid, determining the severity of the partial discharge of the power facility in the power grid according to the analyzed curve of the partial discharge condition of the power facility in the power grid, and prompting a worker managing the power facility in the power grid to maintain, repair or even replace the device for the corresponding power facility, thereby avoiding occurrence of a large-scale power outage due to incapability of the power facility.
In the several embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a module or a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be substantially or partially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a part of the embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the present invention through the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
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| CN111190086A (en) * | 2020-03-11 | 2020-05-22 | 华北电力大学 | A GIS partial discharge online monitoring device |
| CN113030662B (en) * | 2021-03-08 | 2022-09-13 | 天津大学 | Method for measuring local discharge erosion resistance of multi-sensor polymer insulating material |
| CN115255650B (en) * | 2022-08-12 | 2024-12-24 | 国网江苏省电力有限公司泰州供电分公司 | A sound focusing device for voiceprint monitoring and preparation method thereof |
| CN118033336B (en) * | 2024-02-02 | 2025-02-25 | 国网宁夏电力有限公司银川供电公司 | Power grid partial discharge monitoring equipment based on gas detection |
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| JPH06331691A (en) * | 1993-05-24 | 1994-12-02 | Furukawa Electric Co Ltd:The | Method for measuring partial discharge of power cable and its connection |
| CN101644737A (en) * | 2009-09-10 | 2010-02-10 | 优能电气（天津）有限公司 | Positioning device and positioning method for fault detection of local discharge |
| CN105467283B (en) * | 2015-12-04 | 2018-09-28 | 重庆臻远电气有限公司 | Local discharge signal harvester |
| CN107677939A (en) * | 2017-08-08 | 2018-02-09 | 国网浙江省电力公司嘉兴供电公司 | A kind of localization method of electric power GIS Partial Discharge Sources |
| CN210166461U (en) * | 2019-05-08 | 2020-03-20 | 广东锦煜智能科技有限公司 | A partial discharge online monitoring system and equipment |
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