CN114217167A - Distributed voltage transformer secondary circuit N600 grounding current detection system - Google Patents

Distributed voltage transformer secondary circuit N600 grounding current detection system Download PDF

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Publication number
CN114217167A
CN114217167A CN202111479926.XA CN202111479926A CN114217167A CN 114217167 A CN114217167 A CN 114217167A CN 202111479926 A CN202111479926 A CN 202111479926A CN 114217167 A CN114217167 A CN 114217167A
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China
Prior art keywords
module
current
alarm
grounding
relay
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Chinese (zh)
Inventor
袁仁彪
徐军
杨波
李道豫
刘长发
余超
舒斌
贺强
吴朝奎
李博一
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Guiyang Bureau Extra High Voltage Power Transmission Co
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Guiyang Bureau Extra High Voltage Power Transmission Co
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Priority to CN202111479926.XA priority Critical patent/CN114217167A/en
Publication of CN114217167A publication Critical patent/CN114217167A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a distributed voltage transformer secondary circuit N600 grounding current detection system, and relates to the technical field of current detection. The invention comprises a current transformer, a power supply processing module, a microcomputer processing module and a public measurement and control device; the output end of the microcomputer processing module is connected with the public measurement and control device through the alarm output unit module; the microcomputer processing module is used for receiving the data volume converted from the current analog volume data of the neutral line N600 by the data conversion module and judging the position of the fault of the neutral line N600; the output end of the public measurement and control device is connected with a monitoring background signal alarm module and a telecontrol dispatching main station monitoring module. The grounding state of the neutral point N600 of the voltage transformer of the substation is monitored in real time through communication of the plurality of test units and the server, the grounding state of one point of the secondary neutral point N600 of the voltage transformer of the substation of the power grid in the jurisdiction area is comprehensively mastered, and related alarm information is timely triggered when the N600 is subjected to multipoint grounding, so that potential safety hazards are discovered, the safe and stable operation of the power grid is guaranteed, the working efficiency is improved, and the grounding monitoring system has a better application prospect.

Description

Distributed voltage transformer secondary circuit N600 grounding current detection system
Technical Field
The invention belongs to the technical field of current detection, and particularly relates to a secondary circuit N600 grounding current detection system of a distributed voltage transformer.
Background
According to the key points of measures for relay protection and anti-accident of safety automatic devices in power systems, a plurality of groups of voltage transformer (PT) secondary circuits which are communicated through a zero-phase small bus (N600) of a control room are regulated, only one point of N600 is grounded in the control room, the secondary neutral point of each voltage transformer is disconnected at a grounding point of a switch field to ensure reliable grounding, and the neutral line of each voltage transformer is not connected with a breaker or a contactor which can be disconnected.
In actual operation, due to design, construction, secondary equipment aging and insulation breakdown, a secondary neutral point N600(PTN600) of a voltage transformer can be grounded at two points, a switch field is grounded, a control room is grounded at the same time, when a system fails, a transformer substation grounding grid flows large fault current, potential difference occurs at two ends of the N600, voltage phase deviation of the neutral point is caused, amplitude and phase of phase voltage and zero sequence voltage are further influenced, and distance protection and zero sequence direction protection can be rejected or misoperation can be caused.
Disclosure of Invention
The invention aims to provide a distributed system for detecting the grounding current of a secondary circuit N600 of a voltage transformer, which can comprehensively control the grounding condition of one point of a secondary neutral point N600 of a voltage transformer of a power grid transformer substation in a jurisdiction area by monitoring the grounding condition of the neutral point N600 of the voltage transformer of the substation in real time, trigger related alarm information in time when the N600 is grounded at multiple points, find potential safety hazards and solve the problems of misoperation of the conventional outside-area fault protection device and failure of the conventional inside-area fault protection device.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a distributed voltage transformer secondary circuit N600 grounding current detection system, which comprises a current transformer, a power supply processing module, a microcomputer processing module and a common measurement and control device, wherein the current transformer sequentially passes through an acquisition module, an amplification module, a data conversion module and the microcomputer processing module; the current transformer adopts open TC pliers and is used for collecting current of a secondary neutral point N600 grounding wire of a transformer substation voltage transformer; the power supply processing module, the acquisition module, the amplification module, the data conversion module and the microcomputer processing module; the output end of the microcomputer processing module is connected with the public measurement and control device through the alarm output unit module; the microcomputer processing module is used for receiving the data volume converted from the current analog volume data of the neutral line N600 by the data conversion module and judging the position of the fault of the neutral line N600; the output end of the public measurement and control device is connected with a monitoring background signal alarm module and a telecontrol dispatching main station monitoring module.
As a preferred technical scheme, the power supply processing module outputs direct current 24V as a working power supply for the acquisition module, the amplification module and the data conversion module; the power supply module outputs direct current 48V as a working power supply of the microcomputer processing module; and the power supply processing module is used for providing a working power supply for the transformer substation PT secondary neutral line N600 grounding on-line monitoring device and ensuring the stable operation of the working state of the device by adopting a transformer substation direct-current power supply.
As a preferred technical scheme, the acquisition module performs signal processing on an input analog current value, removes an interference amount, and inputs the processed analog current value to the amplification module; the amplifying module adopts a two-stage amplifying circuit; the two-stage amplifying circuit comprises a first operational amplifier and a second operational amplifier; the first operational amplifier and the second operational amplifier both adopt LM332 operational amplifier chips, and a data conversion module is input at the output end of the two-stage operational amplifier circuit; the data conversion module is an A/D data conversion module; the A/D data conversion module converts the acquisition module and the amplified secondary neutral wire N600 grounding wire current of the voltage transformer into digital signals and inputs the digital signals into the microcomputer processor.
As a preferred technical scheme, the input end of the microcomputer processing module is also connected with a time synchronization module, a fixed value setting module and an automatic reset module; the automatic reset module comprises a reset relay, an alarm reset unit, a power supply and a protective resistor; when the automatic reset module is closed, the alarm indicator lamp of the action relay is turned off, and the normally open contact of the alarm signal is restored to the open state from the action closed state; the constant value setting module is applied to a settable relay and used for presetting an action alarm current threshold, and when the current of the PT secondary neutral line N600 is larger than the action alarm threshold, the relay acts.
As a preferred technical scheme, the output end of the microcomputer processing module is also connected with a storage unit module, an alarm indicator light and a display module; the storage unit module is used for storing action events of the relay; the display module is used for displaying the current and the multipoint grounding information of the multipoint grounding of the current transformer substation PT secondary neutral line N600.
As a preferred technical scheme, the alarm output unit module is used for triggering a relay according to the action of the relay, triggering alarm output when a normally open node of the relay is closed, and outputting the alarm output to a public measurement and control device, and comprises a monitoring background signal alarm module and a telecontrol dispatching master station monitoring module; when the current collected by the online monitoring device exceeds the alarm setting current fixed value, the microcomputer processing module triggers the relay coil to act and the normally open node of the relay is closed when the multipoint grounding is judged.
As a preferable technical scheme, the neutral line N600 grounding online monitoring device comprises a voltage source
Figure BDA0003394546520000031
Voltage source
Figure BDA0003394546520000032
Voltage source
Figure BDA0003394546520000033
A resistance Z and a resistance R; the voltage source
Figure BDA0003394546520000034
And a voltage source
Figure BDA0003394546520000035
After being connected in series with a voltage source
Figure BDA0003394546520000036
Are connected in parallel; the resistor Z and the voltage source
Figure BDA0003394546520000037
Are connected in parallel with each other; the resistor Z is grounded through a resistor R; the other end of the resistor Z is directly grounded;
when R is 0, then
Figure BDA0003394546520000038
In the formula (I), the compound is shown in the specification,
Figure BDA0003394546520000039
represented as the voltage transformer secondary load zero sequence current flowing through the ground branch,
Figure BDA00033945465200000310
shown as the secondary loop N600 ground current that needs to be detected.
As a preferred technical scheme, the microcomputer processing module compares and analyzes the current of the PT secondary neutral line N600, and when the current exceeds the set relay action current of 50mA, the relay action gives an alarm, a monitoring background alarm light word board in a station is lightened, an alarm window pops up related alarm information, and the occurrence of neutral point N600 multipoint grounding is displayed; meanwhile, the automatic reset module resets the action of the coil of the relay K1, so that the device in the alarm state is restored to the on-line monitoring working state; the arrangement of the monitoring background signal alarm module and the telecontrol dispatching master station monitoring module is favorable for uploading the collected and identified monitoring states to a dispatching master station server through a telecontrol device in the station, so that the grounding condition of the PT secondary neutral line N600 of the transformer substation is monitored in real time, and operation and maintenance personnel are informed to handle the monitoring states in time.
As a preferable technical solution, in the process of monitoring the grounding point current of the PT secondary neutral line N600 secondary neutral point N600, when the current exceeds the relay coil action value 50mA, an alarm indicator lamp and an alarm signal are triggered, and event and accident data recording is performed in the storage unit module.
The invention has the following beneficial effects:
the grounding condition of the neutral point N600 of the voltage transformer of the transformer substation of the substation voltage transformer is monitored in real time, the condition that one point of the secondary neutral point N600 of the voltage transformer of the transformer substation of the power grid in the jurisdiction area is grounded is comprehensively mastered, relevant alarm information is timely triggered when multiple points of the N600 are grounded, potential safety hazards are found, misoperation of an external fault protection device and misoperation of an internal fault protection device are avoided, safe and stable operation of the power grid is guaranteed, working efficiency is improved, and the method has a good application prospect.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a system for detecting the grounding current of a secondary loop N600 of a distributed voltage transformer according to the present invention;
fig. 2 is a two-point grounding equivalent circuit diagram of the secondary circuit N600.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a system for detecting the grounding current of a secondary loop N600 of a distributed voltage transformer, which comprises a current transformer, a power processing module, a microcomputer processing module and a common measurement and control device,
the current transformer sequentially passes through the acquisition module, the amplification module, the data conversion module and the microcomputer processing module; the current transformer adopts open TC pincers and is used for collecting the current of a secondary neutral point N600 grounding wire of the voltage transformer of the transformer substation;
the power supply processing module, the acquisition module, the amplification module, the data conversion module and the microcomputer processing module;
the output end of the microcomputer processing module is connected with the public measurement and control device through the alarm output unit module; the microcomputer processing module is used for receiving the data volume converted from the current analog volume data of the neutral line N600 by the data conversion module and judging the position of the fault of the neutral line N600;
the output end of the public measurement and control device is connected with a monitoring background signal alarm module and a telecontrol dispatching main station monitoring module.
The power supply processing module outputs direct current 24V as a working power supply of the acquisition module, the amplification module and the data conversion module; the power supply module outputs direct current 48V as a working power supply of the microcomputer processing module; and the power supply processing module is used for providing a working power supply for the transformer substation PT secondary neutral line N600 grounding on-line monitoring device and ensuring the stable operation of the working state of the device by adopting a transformer substation direct-current power supply.
The acquisition module carries out signal processing on the input analog quantity current value, removes the interference quantity and inputs the processed analog quantity current value into the amplification module; the amplification module adopts a two-stage amplification circuit; the two-stage amplifying circuit comprises a first operational amplifier and a second operational amplifier; the first operational amplifier and the second operational amplifier both adopt LM332 operational amplifier chips, and a data conversion module is input at the output end of the two-stage operational amplifier circuit; the data conversion module is an A/D data conversion module; the A/D data conversion module converts the acquisition module and the amplified ground wire current of the secondary neutral wire N600 of the voltage transformer into digital signals and inputs the digital signals into the microcomputer processor.
The input end of the microcomputer processing module is also connected with a time synchronization module, a fixed value setting module and an automatic reset module; the automatic reset module comprises a reset relay, an alarm reset unit, a power supply and a protective resistor; when the automatic reset module is closed, the alarm indicator lamp of the action relay is turned off, and the normally open contact of the alarm signal is restored to the open state from the action closed state; the time synchronization module is a GPS clock positioned in the transformer substation and is used for the power station PT secondary neutral line N600 grounding online monitoring device; and the fixed value setting module is applied to a settable relay and is used for presetting an action alarm current threshold, and when the current of the PT secondary neutral line N600 is greater than the action alarm threshold, the relay acts.
The output end of the microcomputer processing module is also connected with a storage unit module, an alarm indicator lamp and a display module; the storage unit module is used for storing action events of the relay; and the display module is used for displaying the current and the multipoint grounding information of the multipoint grounding of the current transformer substation PT secondary neutral line N600.
The alarm output unit module is used for triggering the relay according to the action of the relay, triggering alarm output when a normally open node of the relay is closed, and outputting the alarm output to the public measurement and control device and comprises a monitoring background signal alarm module and a telecontrol dispatching master station monitoring module; when the current collected by the on-line monitoring device exceeds the alarm setting current fixed value, the microcomputer processing module triggers the relay coil to act and the normally open node of the relay is closed when the multipoint grounding is judged.
The neutral line N600 grounding on-line monitoring device comprises a voltage source
Figure BDA0003394546520000071
Voltage source
Figure BDA0003394546520000072
Voltage source
Figure BDA0003394546520000073
A resistance Z and a resistance R; voltage source
Figure BDA0003394546520000074
And a voltage source
Figure BDA0003394546520000075
After being connected in series with a voltage source
Figure BDA0003394546520000076
Are connected in parallel; resistance Z and voltage source
Figure BDA0003394546520000077
Are connected in parallel with each other; the resistor Z is grounded through the resistor R; the other end of the resistor Z is directly grounded;
when R is 0, then
Figure BDA0003394546520000078
In the formula (I), the compound is shown in the specification,
Figure BDA0003394546520000079
represented as the voltage transformer secondary load zero sequence current flowing through the ground branch,
Figure BDA00033945465200000710
the ground current of the secondary circuit N600 which needs to be detected is shown, because the resistance value of the resistor Z is very small, the resistor R slightly changes,
Figure BDA00033945465200000711
the change of (a) is obvious and easy to monitor.
The microcomputer processing module is used for carrying out comparative analysis on the current of the PT secondary neutral line N600, and exceeding the set relay action current by 50mA, the relay action gives an alarm, a monitoring background alarm optical word board in the station is lightened, an alarm window pops up related alarm information, and the occurrence of neutral point N600 multipoint grounding is displayed; meanwhile, the automatic reset module resets the action of the coil of the relay K1, so that the device in the alarm state is restored to the on-line monitoring working state; the arrangement of the monitoring background signal alarm module and the telecontrol dispatching master station monitoring module is favorable for uploading the collected and identified monitoring states to a dispatching master station server through a telecontrol device in the station, so that the grounding condition of the PT secondary neutral line N600 of the transformer substation is monitored in real time, and operation and maintenance personnel are informed to handle the monitoring states in time.
In the process of monitoring the grounding point current of the PT secondary neutral line N600 secondary neutral point N600, when the current exceeds the action value of the relay coil by 50mA, an alarm indicator lamp and an alarm signal are triggered, and event and accident data recording is carried out in a storage unit module.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, it is understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing associated hardware, and the corresponding program may be stored in a computer-readable storage medium.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (9)

1. The utility model provides a distributing type voltage transformer secondary circuit N600 ground current detecting system, includes current transformer, power processing module, microcomputer processing module and public measurement and control device, its characterized in that:
the current transformer sequentially passes through the acquisition module, the amplification module, the data conversion module and the microcomputer processing module; the current transformer adopts open TC pliers and is used for collecting current of a secondary neutral point N600 grounding wire of a transformer substation voltage transformer;
the power supply processing module, the acquisition module, the amplification module, the data conversion module and the microcomputer processing module;
the output end of the microcomputer processing module is connected with the public measurement and control device through the alarm output unit module; the microcomputer processing module is used for receiving the data volume converted from the current analog volume data of the neutral line N600 by the data conversion module and judging the position of the fault of the neutral line N600;
the output end of the public measurement and control device is connected with a monitoring background signal alarm module and a telecontrol scheduling main station monitoring module;
the current transformers are in communication connection with each other; and the current transformers are in communication connection with the background server through the announcement measurement and control device.
2. The system for detecting the grounding current of the secondary circuit N600 of the distributed voltage transformer according to claim 1, wherein the power supply processing module outputs direct current 24V as a working power supply of the acquisition module, the amplification module and the data conversion module; the power supply module outputs direct current 48V as a working power supply of the microcomputer processing module; and the power supply processing module is used for providing a working power supply for the transformer substation PT secondary neutral line N600 grounding on-line monitoring device and ensuring the stable operation of the working state of the device by adopting a transformer substation direct-current power supply.
3. The system for detecting the grounding current of the secondary circuit N600 of the distributed voltage transformer according to claim 1, wherein the acquisition module processes an input analog current value, removes an interference amount, and inputs the processed analog current value into the amplification module; the amplifying module adopts a two-stage amplifying circuit; the two-stage amplifying circuit comprises a first operational amplifier and a second operational amplifier; the first operational amplifier and the second operational amplifier both adopt LM332 operational amplifier chips, and a data conversion module is input at the output end of the two-stage operational amplifier circuit; the data conversion module is an A/D data conversion module; the A/D data conversion module converts the acquisition module and the amplified secondary neutral wire N600 grounding wire current of the voltage transformer into digital signals and inputs the digital signals into the microcomputer processor.
4. The system for detecting the grounding current of the secondary circuit N600 of the distributed voltage transformer according to claim 1, wherein the input end of the microcomputer processing module is further connected with a time setting module, a constant value setting module and an automatic resetting module; the automatic reset module comprises a reset relay, an alarm reset unit, a power supply and a protective resistor; when the automatic reset module is closed, the alarm indicator lamp of the action relay is turned off, and the normally open contact of the alarm signal is restored to the open state from the action closed state; the constant value setting module is applied to a settable relay and used for presetting an action alarm current threshold, and when the current of the PT secondary neutral line N600 is larger than the action alarm threshold, the relay acts.
5. The system for detecting the grounding current of the secondary circuit N600 of the distributed voltage transformer according to claim 1, wherein the output end of the microcomputer processing module is further connected with a storage unit module, an alarm indicator lamp and a display module; the storage unit module is used for storing action events of the relay; the display module is used for displaying the current and the multipoint grounding information of the multipoint grounding of the current transformer substation PT secondary neutral line N600.
6. The system for detecting the grounding current of the secondary circuit N600 of the distributed voltage transformer according to any one of claims 1 or 5, wherein the alarm output unit module is used for triggering the relay according to the action of the relay, triggering an alarm output when a normally open node of the relay is closed, and outputting the alarm output to a common measurement and control device, and comprises a monitoring background signal alarm module and a telecontrol dispatching main station monitoring module; when the current collected by the online monitoring device exceeds the alarm setting current fixed value, the microcomputer processing module triggers the relay coil to act and the normally open node of the relay is closed when the multipoint grounding is judged.
7. The system according to claim 2, wherein said neutral line N600 grounding on-line monitoring device comprises a voltage source
Figure FDA0003394546510000031
Voltage source
Figure FDA0003394546510000032
Voltage source
Figure FDA0003394546510000033
A resistance Z and a resistance R; the voltage source
Figure FDA0003394546510000034
And a voltage source
Figure FDA0003394546510000035
After being connected in series with a voltage source
Figure FDA0003394546510000036
Are connected in parallel; the resistor Z and the voltage source
Figure FDA0003394546510000037
Are connected in parallel with each other; the resistor Z is grounded through a resistor R; the other end of the resistor Z is directly grounded;
when R is 0, then
Figure FDA0003394546510000038
In the formula (I), the compound is shown in the specification,
Figure FDA0003394546510000039
represented as the voltage transformer secondary load zero sequence current flowing through the ground branch,
Figure FDA00033945465100000310
shown as the secondary loop N600 ground current that needs to be detected.
8. The system for detecting the grounding current of the secondary loop N600 of the distributed voltage transformer as claimed in claim 1, wherein the microcomputer processing module is used for carrying out comparative analysis on the current of the PT secondary neutral line N600, and when the current exceeds the set relay action current of 50mA, the relay action gives an alarm, a monitoring background alarm light word board in a station is lightened, an alarm window pops up related alarm information, and the occurrence of multi-point grounding of the neutral point N600 is displayed; meanwhile, the automatic reset module resets the action of the coil of the relay K1, so that the device in the alarm state is restored to the on-line monitoring working state; the arrangement of the monitoring background signal alarm module and the telecontrol dispatching master station monitoring module is favorable for uploading the collected and identified monitoring states to a dispatching master station server through a telecontrol device in the station, so that the grounding condition of the PT secondary neutral line N600 of the transformer substation is monitored in real time, and operation and maintenance personnel are informed to handle the monitoring states in time.
9. The system according to claim 8, wherein during the monitoring of the grounding point current of the secondary neutral point N600 of the PT secondary neutral line N600, when the current exceeds the relay coil action value of 50mA, an alarm indicator light and an alarm signal are triggered, and event and accident data recording is performed in the storage unit module.
CN202111479926.XA 2021-12-06 2021-12-06 Distributed voltage transformer secondary circuit N600 grounding current detection system Pending CN114217167A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115407241A (en) * 2022-10-31 2022-11-29 国网辽宁省电力有限公司 Secondary circuit grounding current monitoring system, method and computer readable storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115407241A (en) * 2022-10-31 2022-11-29 国网辽宁省电力有限公司 Secondary circuit grounding current monitoring system, method and computer readable storage medium

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