CN202903922U - Corrosion fault point diagnosis system for substation grounding grids - Google Patents

Corrosion fault point diagnosis system for substation grounding grids Download PDF

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Publication number
CN202903922U
CN202903922U CN2012205561831U CN201220556183U CN202903922U CN 202903922 U CN202903922 U CN 202903922U CN 2012205561831 U CN2012205561831 U CN 2012205561831U CN 201220556183 U CN201220556183 U CN 201220556183U CN 202903922 U CN202903922 U CN 202903922U
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signal
substation
fault point
diagnosis system
grounding
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朱雪松
邬欣
杨莉萍
陈美荣
吴国强
王炜
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Huzhou Power Supply Bureau
State Grid Corp of China SGCC
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Huzhou Power Supply Bureau
State Grid Corp of China SGCC
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    • 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

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Abstract

The utility model provides a corrosion fault point diagnosis system for substation grounding grids. The system comprises an alternating-current signal collection sensor used for acquiring a node current and a voltage signal of the substation grounding grid, an alternating-current/direct-current signal collector used for receiving the node current and the voltage signal and carrying out data processing and display, a data processing terminal used for receiving data and carrying out fault point analysis and processing, and a communication terminal used for sending the processed data to external information management equipment. With the system, it can be known to what extent every conductor of the grounding grid is corroded and whether every conductor of the grounding grid is broken or not without cutting power or excavating the grounding grid so that safe and reliable operation of a power system can be ensured. The corrosion fault point diagnosis system for substation grounding grids has the advantages of being simple, accurate and unrestrained by field operation conditions.

Description

A kind of grounding net of transformer substation corrodes the fault point diagnosing system
Technical field
The utility model relates generally to a kind of grounding net of transformer substation and corrodes the fault point diagnosing system.
Background technology
Along with large electrical network of modern times to UHV (ultra-high voltage), large capacity and remote future development, more and more higher for power system security, requirement stable and economical operation, in order to ensure the safe and stable operation of electrical network, improve power supply reliability, a good substation grounding device must be arranged.
Trace it to its cause, grounded screen is that electric system is buried at underground hidden facility, and the on-the-spot technical problem underlying that exposes is bad connection between the less than normal and grounding body in ground net corrosion, down conductor cross section, and these problems have buried hidden danger all for the fault of electric power.Ground net corrosion is the process of a gradual change, erodes to a certain degree namely to enter malfunction, and reliability reduces even performance failure, can not satisfy the requirement of safe operation of power system.China is owing to resource, economic dispatch reason, the used material of grounded screen is mainly plain carbon steel, ground net corrosion presents the local corrosion form usually, behind the corrosion grounded screen carbon steel material become fragile, aliquation, loose, attenuate, even fracture, so the electric power grounding grid seriously corroded is the most distinct issues of present China electric power grounding grid, and developed country mainly is as grounded screen with copper material abroad, its ground connection Performance Ratio iron and steel will be got well, and it is slow that extent of corrosion is wanted.
Many important electrical equipments have been concentrated in generating plant, the transformer station, such as transformer, generator, isolating switch, grounding switch, mutual inductor (voltage transformer (VT) summation current transformer), lightning arrester etc., the A of these equipment, B, C three-phase generally all are to link to each other with band steel, link to each other with grounded screen by down conductor again.Transformer station, generating plant also add concentrated grounding body except laying grounded screen under lightning rod and lightning arrester.Along with the rising of generating plant, transformer substation voltage grade, also more and more higher to the requirement of laying the used band steel of grounded screen.
Grounded screen places underground, and the grounding body cross section reduces in case grounded screen owing to other reasons such as corrosion cause fault, will cause, thermal stability inadequate, stake resistance increases.Although when carrying out ground grid design, adopt various safeguard procedures to reduce the extent of corrosion of grounded screen as far as possible, even but best design and safeguard procedures can not be predicted all situations that may occur in the service life, still various grounded screen faults can occur in actual use, jeopardize safe operation of power system.In case the grounded screen seriously corroded is defective to the stake resistance that makes grounded screen, even during local fracture, it is quite hard and difficult that overhauling of grounded screen transformed, and expense also is huge.Therefore must be frequently or termly the situation of grounded screen is detected, with the variation tendency of analysis grounding net, and the situation of grounded screen assessed, pinpointed the problems early to take corresponding safeguard procedures, prevent trouble before it happens, the maintenance of earthing device is seemed very urgent and important.
The state-detection of grounded screen is a very important course of work always, also be a very hard work simultaneously, existing method is after finding the accident that ground network ground resistance is defective or the generation earth mat causes, the method of searching grounded screen conductor breakpoint and corrosion section by dig on a wide area is very big with blindness, workload, when carrying out actual detection very large change need to be arranged to the environment of electric substation, uncertainly can accurately detect quality, affect the safe operation of electric system.Therefore the utility model of grounding net of transformer substation Research on Intelligent Diagnosis system, be the power system security economical production in the urgent need to problem.
The utility model content
The utility model is intended to solve the defective that prior art exists, and designs a kind of transformer station grounding network corrosion trouble spot intelligent diagnostics, detects data in order to gather ground net corrosion, fast, accurately and easily the ground net corrosion situation is detected.
In order to realize above-mentioned purpose of design, the technical solution of the utility model 1 designs a kind of transformer station grounding network corrosion trouble spot intelligent diagnostics, by gathering grounded screen node voltage and current value grounded screen fault is detected.
In order to realize above-mentioned purpose of design, the technical solution of the utility model 2, the ground net corrosion trouble spot intelligent diagnosing method that matches with signal source, sensor by signal acquiring system.Both can avoid the problem that only can not accurately locate by Potential Distributing, and can avoid again grounded screen excessive and cause PC to calculate, or the inaccurate problem of result of calculation.
The technical solution of the utility model 1: a kind of grounding net of transformer substation corrodes the fault point diagnosing system, comprising:
The ac signal acquisition sensor is for the node current and the voltage signal that obtain transformer station grounding network;
The alternating current-direct current signal picker is used for receiving described node current and voltage signal and carries out data processing and demonstration;
Data processing terminal is used for receive data and carries out trouble spot analysis and processing; And
Communication ends, the data after being used for processing send to the external information management equipment.
Further, in preferred embodiment of the present utility model, described alternating current-direct current signal picker comprises data acquisition module, usb communication module, microcontroller, liquid crystal display and power supply, wherein said data acquisition module input end connects the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller; Described usb communication module, power supply and liquid crystal display are connected to microcontroller; Be connected by the usb communication module between described alternating current-direct current signal picker and the data processing terminal.
Further, in preferred embodiment of the present utility model, described ac signal acquisition sensor comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal picker.
Further, in preferred embodiment of the present utility model, described data acquisition module comprises analog to digital converter and the high precision reference potential device that is attached thereto, and the preposition anti-jamming circuit that is coupled in described analog to digital converter.
Further, in preferred embodiment of the present utility model, described preposition anti-jamming circuit is to be arranged between detecting coil and the analog to digital converter, is used for the on-the-spot electromagnetic interference (EMI) of filtering grounded screen.
The technical solution of the utility model 2: a kind of grounding net of transformer substation corrodes the fault point diagnosing system, comprising: signal excitation system and signal detection system, wherein
Described signal excitation system comprises:
Grounding net of transformer substation;
The substation grounding subnet;
The sinusoidal ac signal generator is used for connecting between the lower guide body of described grounding net of transformer substation to inject the AC sine electric signal;
Direct-flow signal generator is used for connecting between the lower guide body of described substation grounding subnet to inject dc signal;
Described signal detection system comprises:
The ac signal acquisition sensor is for the node current and the voltage signal that obtain transformer station grounding network;
The alternating current-direct current signal picker is used for receiving described node current and voltage signal and carries out data processing and demonstration;
Data processing terminal is used for receive data and carries out trouble spot analysis and processing; And
Communication ends, the data after being used for processing send to the external information management equipment.
Further, in preferred embodiment of the present utility model, described alternating current-direct current signal picker comprises data acquisition module, usb communication module, microcontroller, liquid crystal display and power supply, wherein said data acquisition module input end connects the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller; Described usb communication module, power supply and liquid crystal display are connected to microcontroller; Be connected by the usb communication module between described alternating current-direct current signal picker and the data processing terminal.
Further, in preferred embodiment of the present utility model, described ac signal acquisition sensor comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal picker.
Further, in preferred embodiment of the present utility model, described data acquisition module comprises analog to digital converter and the high precision reference potential device that is attached thereto, and the preposition anti-jamming circuit that is coupled in described analog to digital converter.
Further, in preferred embodiment of the present utility model, described preposition anti-jamming circuit is to be arranged between detecting coil and the analog to digital converter, is used for the on-the-spot electromagnetic interference (EMI) of filtering grounded screen.
Whether the beneficial effects of the utility model are apparent, and the utility model can be in the situation that do not have a power failure and to earth mat excavation, can understand the extent of corrosion of each section of earth mat conductor and rupture, and ensure safety, the reliability service of electric system.And have the advantages such as restriction that simply, accurately, are not subjected to on-the-spot service condition.
Description of drawings
Preferred implementation of the present utility model will be following by embodying with reference to the mode of accompanying drawing in detail, and the identical function components/modules among the figure is with same-sign mark in addition, wherein
Fig. 1 is that structure of the present utility model forms schematic diagram.
Embodiment
With reference to Fig. 1, the first preferred embodiment of the utility model grounding net of transformer substation corrosion fault point diagnosing system comprises:
Ac signal acquisition sensor 1 is for the node current and the voltage signal that obtain transformer station grounding network;
Alternating current-direct current signal picker 2 is used for receiving described node current and voltage signal and carries out data processing and demonstration;
Data processing terminal 3 is used for receive data and carries out trouble spot analysis and processing; And
Communication ends 4, the data after being used for processing send to the external information management equipment, and for example electric system terminal management system or supervisory system can derive electric power and detect data or printing reports.
Further, in preferred embodiment of the present utility model, described alternating current-direct current signal picker 2 comprises data acquisition module 21, usb communication module 22, microcontroller 23, liquid crystal display 24 and power supply 25, wherein said data acquisition module 21 input ends connect the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller 23; Described usb communication module 22, power supply 25 and liquid crystal display 24 are connected to microcontroller 23; Be connected by usb communication module 22 between described alternating current-direct current signal picker 2 and the data processing terminal 3.
Further, in preferred embodiment of the present utility model, described ac signal acquisition sensor 1 comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal picker 2.
Further, in preferred embodiment of the present utility model, described data acquisition module 21 comprises analog to digital converter 211 and the high precision reference potential device 212 that is attached thereto, and the preposition anti-jamming circuit that is coupled in described analog to digital converter 211.
Further, in preferred embodiment of the present utility model, described preposition anti-jamming circuit is to be arranged between detecting coil and the analog to digital converter 211, is used for the on-the-spot electromagnetic interference (EMI) of filtering grounded screen.
The first preferred embodiment of the utility model grounding net of transformer substation corrosion fault point diagnosing system comprises: signal excitation system and signal detection system, and signal excitation system wherein comprises:
Grounding net of transformer substation;
The substation grounding subnet;
The sinusoidal ac signal generator is used for connecting between the lower guide body of described grounding net of transformer substation to inject the AC sine electric signal;
Direct-flow signal generator is used for connecting between the lower guide body of described substation grounding subnet to inject dc signal;
Signal detection system comprises:
Ac signal acquisition sensor 1 is for the node current and the voltage signal that obtain transformer station grounding network;
Alternating current-direct current signal picker 2 is used for receiving described node current and voltage signal and carries out data processing and demonstration;
Data processing terminal 3 is used for receive data and carries out trouble spot analysis and processing; And
Communication ends 4, the data after being used for processing send to the external information management equipment.
Further, in preferred embodiment of the present utility model, described alternating current-direct current signal picker 2 comprises data acquisition module 21, usb communication module 22, microcontroller 23, liquid crystal display 24 and power supply 25, wherein said data acquisition module 21 input ends connect the output terminal of detecting coil to receive signal, and output terminal is connected to microcontroller 23; Described usb communication module 22, power supply 25 and liquid crystal display 24 are connected to microcontroller 23; Be connected by usb communication module 22 between described alternating current-direct current signal picker 2 and the data processing terminal 3.
Further, in preferred embodiment of the present utility model, described ac signal acquisition sensor 1 comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal picker 2.
Further, in preferred embodiment of the present utility model, described data acquisition module 21 comprises analog to digital converter 211 and the high precision reference potential device 212 that is attached thereto, and the preposition anti-jamming circuit that is coupled in described analog to digital converter 211.
Further, in preferred embodiment of the present utility model, described preposition anti-jamming circuit is to be arranged between detecting coil and the analog to digital converter 211, is used for the on-the-spot electromagnetic interference (EMI) of filtering grounded screen.
In preferred embodiment of the present utility model, at first be under the prerequisite of analyzing the substation grounding web frame, the applied topology decomposition method is decomposed grounding net of transformer substation and is chosen optimum point; Between reaching the standard grade in drawing of optimum point with sinusoidal ac signal input grounding net; The ac signal acquisition sensor 1 that utilization presets will change induced voltage signal into because of the magnetic induction density signal that Injection Current excites on the earth's surface, and the distribution that can measure the magnetic induction density on earth's surface this moment is used for calculating after a while; Obtain data and send data processing terminal 3(to by the alternating current-direct current signal acquiring system and be preferably PC or PDA equipment) after, calculating grounding net of transformer substation earth's surface magnetic induction density under normal circumstances distributes, then measurement result and simulation result are compared, according to both difference, the Position Approximate of diagnosing out the ground net corrosion trouble spot to occur; Behind the Position Approximate of selecting the appearance of ground net corrosion trouble spot, PC 3 generates a small-sized grounded screen regional model automatically near this position, being external in drawing of choosing at random in this small-sized grounded screen zone with the D.C. high-current source reaches the standard grade, voltage between the measurement ground lead and the electric current in loop obtain the input pickup resistance between two ground leads; Measurement result is inputted the resistance value that PC 3 obtains each section conductor; Resistance value during with this resistance value and normal condition compares, and can obtain just that grounded screen band iron corrosion attenuates or particular location and the degree of the defective that ruptures.
Further, in preferred embodiment of the present utility model, add anti-jamming circuit at the collection signal end, effectively suppress on-the-spot electromagnetic interference (EMI), to the signal of measuring gained after notch filter, filtering, phase sensitive detection are processed, with power frequency and other interference rejection.
Being preferred implementation of the present utility model only below, being intended to embody outstanding technique effect of the present utility model and advantage, is not to be restriction to the technical solution of the utility model.Those skilled in the art will appreciate that all modifications of having done based on the utility model technology contents, variation or substitute technology feature, all should be covered by in the technology category of the utility model claims opinion.

Claims (10)

1.一种变电站接地网腐蚀故障点诊断系统，其特征在于包括：  1. A substation grounding grid corrosion fault point diagnosis system, characterized in that it comprises: 交流信号采集传感器，用于获取发变电站接地网的节点电流和电压信号；  The AC signal acquisition sensor is used to acquire the node current and voltage signals of the grounding network of the power substation; 交直流信号采集器，用于接收所述节点电流和电压信号并进行数据处理和显示；  AC and DC signal collectors, used to receive the node current and voltage signals and perform data processing and display; 数据处理终端，用于接收数据并进行故障点分析和处理；以及  Data processing terminal for receiving data and performing analysis and processing of fault points; and 通信端，用于将处理后的数据发送给外部信息管理设备。  The communication terminal is used to send the processed data to an external information management device. the 2.根据权利要求1所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述交直流信号采集器包括数据采集模块、USB通信模块、微控制器、液晶显示器和电源，其中所述数据采集模块输入端连接探测线圈的输出端以接收信号，输出端连接至微控制器；所述USB通信模块、电源以及液晶显示器连接至微控制器；所述交直流信号采集器与数据处理终端之间是通过USB通信模块加以连接。  2. substation ground grid corrosion fault point diagnosis system according to claim 1, is characterized in that: described AC/DC signal collector comprises data acquisition module, USB communication module, microcontroller, liquid crystal display and power supply, wherein said The input end of the data acquisition module is connected to the output end of the detection coil to receive the signal, and the output end is connected to the microcontroller; the USB communication module, power supply and liquid crystal display are connected to the microcontroller; the AC/DC signal collector and the data processing terminal They are connected through a USB communication module. the 3.根据权利要求1所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述交流信号采集传感器包括探测线圈，所述探测线圈的信号输出端接交直流信号采集器的输入端。  3. The substation grounding grid corrosion fault diagnosis system according to claim 1, wherein the AC signal acquisition sensor includes a detection coil, and the signal output terminal of the detection coil is connected to the input terminal of the AC and DC signal collector. the 4.根据权利要求2所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述数据采集模块包括模数转换器和与之连接的高精度参考电位器，以及耦合于所述模数转换器的前置抗干扰电路。  4. the substation ground grid corrosion fault point diagnostic system according to claim 2, is characterized in that: the data acquisition module includes an analog-to-digital converter and a high-precision reference potentiometer connected thereto, and is coupled to the modulus The front anti-interference circuit of the converter. the 5.根据权利要求4所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述前置抗干扰电路是接设于探测线圈与模数转换器之间，用于滤除接地网现场电磁干扰。  5. The substation ground grid corrosion fault point diagnosis system according to claim 4, characterized in that: the pre-interference anti-interference circuit is connected between the detection coil and the analog-to-digital converter, and is used to filter out ground grid site electromagnetic interference. the 6.一种变电站接地网腐蚀故障点诊断系统，其特征在于包括：信号激励系统以及信号检测系统，其中  6. A substation grounding grid corrosion fault point diagnosis system, characterized in that it includes: a signal excitation system and a signal detection system, wherein 所述信号激励系统包括：  The signal excitation system includes: 变电站接地网；  Substation grounding grid; 变电站接地子网；  substation grounding subnet; 正弦交流信号发生器，用于连接所述变电站接地网的下引导体间以注入交流正弦电信号；  A sinusoidal AC signal generator, used to connect the lower conductors of the substation grounding grid to inject AC sinusoidal electrical signals; 直流信号发生器，用于连接所述变电站接地子网的下引导体间以注入直流电信号；  A DC signal generator, used to connect the lower conductors of the substation grounding subnet to inject DC signals; 所述信号检测系统包括：  The signal detection system includes: 交流信号采集传感器，用于获取发变电站接地网的节点电流和电压信号；  The AC signal acquisition sensor is used to acquire the node current and voltage signals of the grounding network of the power substation; 交直流信号采集器，用于接收所述节点电流和电压信号并进行数据处理和显示；  AC and DC signal collectors, used to receive the node current and voltage signals and perform data processing and display; 数据处理终端，用于接收数据并进行故障点分析和处理；以及  Data processing terminal for receiving data and performing analysis and processing of fault points; and 通信端，用于将处理后的数据发送给外部信息管理设备。  The communication terminal is used to send the processed data to an external information management device. the 7.根据权利要求6所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述交直流信号采集器包括数据采集模块、USB通信模块、微控制器、液晶显示器和电源，其中所述数据采集模块输入端连接探测线圈的输出端以接收信号，输出端连接至微控制器；所述USB通信模块、电源以及液晶显示器连接至微控制器；所述交直流信号采集器与数据处理终端之间是通过USB通信模块加以连接。  7. substation grounding network corrosion fault point diagnosis system according to claim 6, is characterized in that: described AC/DC signal collector comprises data acquisition module, USB communication module, microcontroller, liquid crystal display and power supply, wherein said The input end of the data acquisition module is connected to the output end of the detection coil to receive the signal, and the output end is connected to the microcontroller; the USB communication module, power supply and liquid crystal display are connected to the microcontroller; the AC/DC signal collector and the data processing terminal They are connected through a USB communication module. the 8.根据权利要求6所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述交流信号采集传感器包括探测线圈，所述探测线圈的信号输出端接交直流信号采集器的输入端。  8. The substation grounding grid corrosion fault point diagnosis system according to claim 6, wherein the AC signal acquisition sensor includes a detection coil, and the signal output terminal of the detection coil is connected to the input terminal of the AC and DC signal collector. the 9.根据权利要求7所述的变电站接地网腐蚀故障点诊断系统，其特征在于： 所述数据采集模块包括模数转换器和与之连接的高精度参考电位器，以及耦合于所述模数转换器的前置抗干扰电路。  9. substation ground grid corrosion fault point diagnosis system according to claim 7, is characterized in that: described data acquisition module comprises analog-to-digital converter and the high-precision reference potentiometer that is connected with it, and is coupled to described modulus The front anti-interference circuit of the converter. the 10.根据权利要求9所述的变电站接地网腐蚀故障点诊断系统，其特征在于：所述前置抗干扰电路是接设于探测线圈与模数转换器之间，用于滤除接地网现场电磁干扰。  10. The substation grounding grid corrosion fault point diagnosis system according to claim 9, characterized in that: the pre-interference anti-interference circuit is connected between the detection coil and the analog-to-digital converter, and is used to filter out grounding grid site electromagnetic interference. the
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CN103323694A (en) * 2013-05-16 2013-09-25 云南电力试验研究院（集团）有限公司电力研究院 Method for detecting shortage of grounding grid conductor of transformer substation
CN103837775A (en) * 2014-03-17 2014-06-04 国家电网公司 Grounding grid corrosion diagnostic method and device
WO2015074473A1 (en) * 2013-11-21 2015-05-28 国网重庆市电力公司电力科学研究院 Grounding grid breakpoint diagnostic method for transient electromagnetic method
CN104678261A (en) * 2015-03-26 2015-06-03 重庆大学 Device and method for detecting corrosion state of grounding grid
CN104777400A (en) * 2015-03-03 2015-07-15 国网河南省电力公司电力科学研究院 Three-dimensional digitalized monitoring device for substation grounding grid and evaluation method
CN104965153A (en) * 2015-06-10 2015-10-07 国网上海市电力公司 High frequency electromagnetic pulse-based transformer station grounding grid corrosion detection system and method
CN105652155A (en) * 2016-03-03 2016-06-08 国网山东省电力公司章丘市供电公司 Transformer substation grounding grid fault corrosion monitoring method and system
CN106646142A (en) * 2017-03-06 2017-05-10 云南电网有限责任公司电力科学研究院 Grounding grid broken point diagnosis method and transient electromagnetic detection device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323694A (en) * 2013-05-16 2013-09-25 云南电力试验研究院（集团）有限公司电力研究院 Method for detecting shortage of grounding grid conductor of transformer substation
CN103323694B (en) * 2013-05-16 2016-01-06 云南电力试验研究院（集团）有限公司电力研究院 A kind of grounding net of transformer substation conductor disappearance detection method
WO2015074473A1 (en) * 2013-11-21 2015-05-28 国网重庆市电力公司电力科学研究院 Grounding grid breakpoint diagnostic method for transient electromagnetic method
CN103837775A (en) * 2014-03-17 2014-06-04 国家电网公司 Grounding grid corrosion diagnostic method and device
CN104777400A (en) * 2015-03-03 2015-07-15 国网河南省电力公司电力科学研究院 Three-dimensional digitalized monitoring device for substation grounding grid and evaluation method
CN104678261A (en) * 2015-03-26 2015-06-03 重庆大学 Device and method for detecting corrosion state of grounding grid
CN104965153A (en) * 2015-06-10 2015-10-07 国网上海市电力公司 High frequency electromagnetic pulse-based transformer station grounding grid corrosion detection system and method
CN104965153B (en) * 2015-06-10 2017-12-15 国网上海市电力公司 Grounding net of transformer substation corrosion detection system and method based on high-frequency electromagnetic pulse
CN105652155A (en) * 2016-03-03 2016-06-08 国网山东省电力公司章丘市供电公司 Transformer substation grounding grid fault corrosion monitoring method and system
CN106646142A (en) * 2017-03-06 2017-05-10 云南电网有限责任公司电力科学研究院 Grounding grid broken point diagnosis method and transient electromagnetic detection device
CN106646142B (en) * 2017-03-06 2023-06-09 云南电网有限责任公司电力科学研究院 Grounding grid breakpoint diagnosis method and transient electromagnetic detection device

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