CN116338377A - Method and system for acquiring data on line in real time and realizing ground network fault monitoring - Google Patents
Method and system for acquiring data on line in real time and realizing ground network fault monitoring Download PDFInfo
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Abstract
The invention discloses a method and a system for acquiring data on line in real time and realizing ground network fault monitoring, and belongs to the technical field of ground network fault monitoring. The invention injects exciting current, and measures the grounding resistance and the accessible node voltage of the grounding network based on the multichannel self-adaptive variable frequency measurement technology in real time; establishing an annual data set of the grounding resistance based on the grounding resistance monitoring data obtained by annual real-time monitoring, analyzing the resistance change of each branch node of the grounding network by utilizing the theorem related to the electric network theory based on the accessible node voltage obtained in real time, the established grounding network model and the fault equation, and obtaining the non-accessible node voltage and the resistance for judging the operation state of the branch; and judging the fault of the grounding network based on the non-accessible node voltage and the resistor of the branch running state so as to determine fault point position information, wherein the fault point position information comprises fault positioning and fault types. The method is used for monitoring the faults of the grounding network.
Description
Technical Field
A method and a system for acquiring data on line in real time and realizing ground network fault monitoring are used for ground network fault monitoring, and belong to the technical field of ground network fault monitoring.
Background
The grounding grid is an important component of an electronic and electric system, and good grounding is an important guarantee for safety of people and equipment. However, the real state of the device is difficult to be known in time after long-time operation, and once lightning stroke or system failure occurs, high fault voltage can be generated, so that normal operation of electric and electronic information equipment is influenced, and the social influence caused by the operation is difficult to be resolved in a short time. The working of the electronic information equipment is highly dependent on the stability of power supply and signal transmission, if the grounding grid has the problems of poor connection, corrosion and the like, the performance of the equipment is reduced and even damaged once lightning and operation overvoltage occur due to the reduction of the current dispersion performance. Therefore, the method realizes the timely discovery and investigation of the faults of the grounding grid, and the intelligent detection and fault diagnosis technology of the grounding grid has important engineering significance for industries such as electric power, inflammable and explosive, electronic information and the like.
The research on the technology of monitoring and fault diagnosis of the grounding grid has been carried out in the eighties of the last century. Foreign studies are less because copper is mostly used as a grounding material. In China, steel is mostly used as a grounding grid, and the corrosion rate of the steel in the same soil is about 7 times that of copper. However, foreign scholars make a major contribution in the theoretical research of grounding grid analysis, and F.Dawalibi1984 et al propose to analyze grounding grid grounding performance by adopting a moment method and develop CDEGS grounding system analysis software.
According to different principles, domestic scholars realize the ground network fault diagnosis method in three aspects.
Electromagnetic analysis: and diagnosing faults by utilizing the measured distribution of the electric field or the magnetic field of the earth surface of the earth screen and combining with the numerical simulation of the earth screen. Jiang Mingliang provides a method for detecting the grounding grid conductor and grid structure of a transformer substation under the condition of no-grid drawing, and the detection of the grounding grid state is realized by utilizing the distribution characteristic and rule of the measured ground surface magnetic induction intensity.
Electrical network analysis: and establishing a fault diagnosis equation based on an electric network theory so as to solve and obtain the corrosion condition of the branch conductor. Liu Jianzai the voltage information of the accessible node is fully utilized, and the undercertainty of the fault equation set is reduced by adopting a method of rotating the excitation position of the current source in the accessible node and measuring the voltage of the node at a plurality of positions during each excitation. Cheng Gongli uses a tabu search algorithm based on the theory of the electric network to realize the partition positioning of the ground network faults.
Electrochemical analysis: according to the principle that a conductor generates direct current when chemically reacting in soil, the corrosion electrochemical detection technology is applied to realize breakpoint detection. Han Lei a field portable rapid corrosion detection system is developed, corrosion conditions are measured in a constant current step mode, and the corrosion state of a grounding grid is judged by obtaining the polarization resistance value of an electrode according to a charging curve.
The above research brings good effect for fault diagnosis of the grounding grid, but has the following technical problems:
1. the electromagnetic analysis method, the electric network analysis method and the electrochemical analysis method still need to shut down the power failure to diagnose the fault of the grounding network, and the cost is high;
2. by adopting an electromagnetic analysis method, an electric network analysis method and an electrochemical analysis method, large-area excavation is still required for fault diagnosis, and the problems of poor fault diagnosis accuracy, high cost and the like are caused due to a certain blindness;
3. the data are required to be acquired on the basis of an electromagnetic analysis method, an electrical network analysis method or an electrochemical analysis method, and complex calculation analysis is performed in a laboratory, so that automatic acquisition and intelligent processing of required parameters cannot be realized.
Disclosure of Invention
Aiming at the problems of the researches, the invention aims to provide a method and a system for acquiring data on line in real time and realizing the fault monitoring of a grounding grid, and solves the problems that the prior art still needs to shut down and stop the power to carry out fault diagnosis on the grounding grid and has high cost.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for acquiring data on line in real time and realizing ground network fault monitoring comprises the following steps:
step 1: injecting exciting current, and measuring the grounding resistance and the accessible node voltage of a grounding grid in real time by frequency conversion based on a multichannel self-adaptive frequency conversion measurement technology; the measurement range of the grounding resistance is 0-1000 ohms, and the measurement accuracy is within 3% +/-2 d. Step 2: establishing an annual data set of the grounding resistance based on the grounding resistance monitoring data obtained by annual real-time monitoring, carrying out change characteristic analysis of monitoring data, obtaining a result of whether the grounding performance of the grounding network is reduced or not based on the change characteristic, if so, turning to step 3, judging whether the grounding performance of the grounding network reaches an early warning value or not, if so, carrying out state early warning, otherwise, carrying out aging prompt;
step 3: based on the available node voltage obtained in real time, an established grounding network model and a fault equation, analyzing the resistance change of each branch node of the grounding network by utilizing the Taylor theorem and the kirchhoff law to obtain non-available node voltage and resistance for judging the operation state of the branch;
step 4: and judging the fault of the grounding network based on the non-accessible node voltage and the resistor of the branch running state so as to determine fault point position information, wherein the fault point position information comprises fault positioning and fault types.
Further, the multichannel adaptive variable frequency measurement technology in the step 1 refers to changing the measurement frequency acquisition amplitude of the grounding grid in the grounding resistance measurement working mode and the node voltage measurement working mode, wherein the frequency range is 40HZ-60HZ.
Further, step 2 is to manually analyze the change characteristics and the trend according to the annual data set of the grounding resistance so as to obtain the change characteristics of the corrosion degree of the grounding network, and the change characteristics are used for judging the specific fault position of the subsequent grounding network.
Further, the grounding network model in the step 3 is obtained by establishing an equivalent circuit model with the grounding network according to the Taylor theorem and the network theory based on the real structure of the grounding network;
the number of the fault equations is the same as that of the ports of the grounding grid, and a mathematical model is established according to the relationship between the Taylor root theorem and the port resistance change and the branch resistance change of the grounding grid.
Further, the step 3 is to assume that the grounding resistance of each section of grounding network is bad, and calculate the distribution and resistance of the non-accessible node voltages in the network according to the step length by using the terylen theorem and kirchhoff law and using different resistance values based on the accessible node voltages acquired in real time, the established grounding network model and the corresponding fault equations.
Further, the specific steps of the step 4 are as follows:
comparing the non-accessible node resistance with the nominal value of the grounding grid resistance, and determining the corrosion degree of the grounding grid by comparing the resistance change multiples, namely comparing the branch resistance obtained by calculation and analysis with the nominal value according to the Taylor theorem, and judging the corrosion degree, namely judging the fault type;
and (3) performing corresponding voltage-to-voltage comparison between the calculated non-reachable node voltage distribution and the measured reachable node voltage distribution to obtain a corresponding square error, and taking the minimum square error value as fault location, wherein the nominal value of the grounding resistor refers to the resistance value of each section of conductor of the grounding grid under the condition of no corrosion.
Further, the method also comprises the step 5: the terminal software platform based on the Internet and the GIS performs visual display on the fault judgment result and the annual data set, and the software platform can control the working state of the intelligent grounding grid detector in real time and control the remote acquisition of data.
A system for acquiring data on-line in real time and implementing ground network fault monitoring, comprising:
and (4) importing a data module: injecting exciting current, and measuring the grounding resistance and the accessible node voltage of a grounding grid in real time by frequency conversion based on a multichannel self-adaptive frequency conversion measurement technology;
and (3) establishing a model module: when the grounding performance of the grounding network is reduced, based on the available node voltage obtained in real time, an established grounding network model and a fault equation, analyzing the resistance change of each branch node of the grounding network by utilizing the Taylor theorem and kirchhoff law to obtain the non-available node voltage and resistance for judging the running state of the branch;
corrosion prediction module: and judging the fault of the grounding network based on the running state of each node and the analyzed change characteristics so as to determine the position information of the fault point and the fault type.
Further, the terminal software platform of the Internet+GIS also comprises a remote control module, a database, a visual alarm and data display module, a data analysis and diagnosis module, a user management module, a report generation module and a data statistics and query module.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes the multichannel variable frequency measurement technology to realize the automatic acquisition of the equation parameters of the electric network, the intelligent analysis of the aging state, the intellectualization and the automation of the fault diagnosis of the grounding grid, obtains the resistance value of the grounding grid in real time through the online diagnosis, can intelligently judge the state and the characteristics of the grounding grid in real time, avoids the randomness and the discontinuity of manual detection, also avoids the problem that the faults generated during the manual detection interval cannot be found in time, simultaneously provides the real-time running state information, utilizes the intelligent diagnosis technology of the grounding grid fault, combines the measurement parameter set (the voltage value of the accessible node, the resistance value of the grounding grid, the calculated voltage value of other nodes and the resistance value of each section of conductor) and the fault discrimination method, realizes the aging warning and the intelligent fault diagnosis method of the grounding grid state under the condition of no human intervention, and can form an area monitoring network through the arrangement of a plurality of measurement sites, and lays a foundation for the large data mining and application; particularly, the real-time monitoring and the acquisition of parameters required by the fault diagnosis of the grounding grid can be realized, the position of the fault point of the grounding grid is intelligently judged by a fault diagnosis method, various and multiple measuring devices are not required to be manually measured under the condition of shutdown and power failure, and long-time analysis and calculation in a laboratory are not required;
2. the invention uses the real-time monitoring data of the long time sequence as the ground network aging criterion, namely, the change curve of the measured value of the ground resistance of the long time sequence is used to realize that the change trend of the resistance value of the ground network is well predicted, thereby realizing the judgment of the aging state of the ground network;
3. according to the invention, the on-line monitoring data is utilized to realize the solving of the ground network fault equation and the discrimination of fault types (corrosion, fracture and the like) in real time, so that the problem of long-time analysis after the data is manually acquired at present is solved;
real-time monitoring and alarming of the state of the grounding grid are realized by utilizing the grounding parameter values (the whole resistance value of the grounding grid) in a long time sequence;
4. the invention can overcome the interference of power frequency current through frequency conversion measurement, acquire the whole grounding resistance value of the grounding grid and judge whether the performance of the grounding system is reduced or not;
5. according to the invention, through the research of the ground network fault diagnosis model, the resistance voltage value of the ground network is detected on line, so that the fault state and the positioning of the ground network are judged through data analysis, and the condition of large-area excavation is avoided.
Drawings
FIG. 1 is a schematic diagram of a technical route of the present invention;
FIG. 2 is a schematic diagram of the overall structure and functional block of the present invention;
FIG. 3 is a schematic diagram of modeling and solving a grounding network in the present invention, wherein the grounding network has accessible node numbers "i, j" and the network model has branch voltage values "branch b+1, b+2, node p, node q, node m, node n";
FIG. 4 is a schematic diagram of a multi-channel measurement according to the present invention;
fig. 5 is a flowchart for diagnosing faults of the ground network according to the present invention, in which the fault type specifically refers to the aging degree of the ground network and the corrosion degree of the ground network, and the ground resistance is increased or broken.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
In connection with the current state of research, further developments will be needed in the following areas: firstly, a grounding grid fault diagnosis model is researched, and through reasonable model establishment, the comprehensive diagnosis of the corrosion condition of the grounding grid under the condition of no need of excavation is realized; secondly, the multidimensional research of the grounding network is combined with comprehensive consideration of ground potential rise, potential difference in the network, contact potential difference and the like; thirdly, a real-time online monitoring and fault diagnosis technology is adopted to timely discover and analyze the faults of the grounding network.
A method for acquiring data on line in real time and realizing ground network fault monitoring comprises the following steps:
step 1: injecting exciting current, and measuring the grounding resistance and the accessible node voltage of a grounding grid in real time by frequency conversion based on a multichannel self-adaptive frequency conversion measurement technology; the multichannel self-adaptive variable frequency measurement technology refers to changing the measurement frequency of a grounding network to obtain amplitude values in a grounding resistance measurement working mode and a node voltage measurement working mode, wherein the frequency range is 40-60 HZ.
And (3) system control: the system adopts an ARM controller of STM32f103 series as a core to coordinate the work among all modules. To avoid the influence of severe environments on the line monitoring circuit, physical isolation is required between the channels during standby. The relay is attracted during sampling test, so that the test wire is connected into the measurement system.
Frequency adjustment: the SPWM waveform is used for controlling the on-off of a switching device in the inverter circuit, so that the area of the output pulse voltage is equal to the area of the output sine wave in a corresponding section, and the frequency and the amplitude of the output voltage of the inverter circuit are regulated by changing the frequency and the amplitude of the modulating wave.
And (3) current control: the constant current source module adopts a software self-feedback regulation mode, and incremental control of digital PID is used for regulating current to be gradually constant. And the current is increased, so that the testing precision of the system is improved.
Signal acquisition and processing: using 2 pieces of CS5460A power IC, one piece measures an alternating current value in a current path, and the other piece measures a voltage between the ground electrodes P and ES. The CS5460A power IC is a highly integrated delta sigma analog-to-digital converter comprising two delta sigma ADCs, high speed power calculation functions and a serial interface, with which the controller ARM communicates easily. The high-speed digital low-pass filter has the functions of high-speed digital low-pass filter, digital compensation filter and digital high-pass filter, and clutter can be well eliminated.
Measurement and communication circuitry: the relay is used as an electronic switch to realize two-channel switching, one is current channel switching, and the variable-frequency constant-current source is used for injecting currents of different measuring channels, so that C-E (1-5) forms a current loop; and secondly, switching between P and PV is realized, and when the node voltage is measured, the switching from P to PV is completed.
The communication module is based on a 4G/5G wireless communication technology, sends measurement data to the GPRS module through an RS232 serial interface, and realizes seamless connection with the Internet at a computer terminal.
The design principle of the switching circuit is as follows:
the sinusoidal wave signal is injected into a grounding system by utilizing the SPWM technology, and the current and voltage signals are sampled at the same time.
The system has two working modes, namely a ground resistance measuring mode, wherein an intermediate accessible node E4 or E3 of the ground network is selected as a test electrode at the moment, and forms a ground resistance measuring circuit together with C-P. And secondly, a node voltage measurement mode is formed by using the PV-E (1-5), after one measurement is completed, a measurement channel is switched, and the last measurement is repeated. And finally, obtaining the grounding resistance of the grounding network and the voltage value of the node.
Switching circuit design description:
the switching circuit testing part is provided with four poles, namely a testing pole E, a testing pole Es-OUT, a voltage pole P and a current pole C.
The test electrode E (the electrode is used in the measurement of a tripolar method and is in short circuit with the Es-OUT electrode) is divided into six channels of E1, E2, E3, E4, E5 and E6;
the test electrode Es-OUT (the electrode is used in three-pole four-wire measurement) is divided into Es-OUT1, es-OUT2,
Six channels of Es-0UT3, es-0UT4, es-0UT5 and Es-0UT 6;
the voltage pole P is divided into six channels P1, P2, P3, P4, P5 and P6;
the current pole C is divided into six channels of C1, C2, C3, C4, C5 and C6.
The four poles can be combined at will, and the time-sharing multiplexing is realized, so that the testing scheme required by the design is compatible, and the flexibility in actual testing is enhanced.
Step 2: establishing an annual data set of the grounding resistance based on the grounding resistance monitoring data obtained by annual real-time monitoring, carrying out change characteristic analysis of monitoring data, obtaining a result of whether the grounding performance of the grounding network is reduced or not based on the change characteristic, if so, turning to step 3, judging whether the grounding performance of the grounding network reaches an early warning value or not, if so, carrying out state early warning, otherwise, carrying out aging prompt; and according to the annual data set of the grounding resistance, the change characteristics and the trend are manually analyzed to obtain the change characteristics of the corrosion degree of the grounding network, and the change characteristics are used for judging the concrete fault position of the subsequent grounding network.
Step 3: based on the available node voltage obtained in real time, an established grounding network model and a fault equation, analyzing the resistance change of each branch node of the grounding network by utilizing the Taylor theorem and the kirchhoff law to obtain non-available node voltage and resistance for judging the operation state of the branch; the grounding network model is obtained by establishing an equivalent circuit model of the grounding network according to the Taylor theorem and the electric network theory based on the real structure of the grounding network;
the failure equation is as follows:
wherein p is the port group to be tested, ΔR K Is the resistance change quantity of the kth branch, delta R jj Is the variation of the resistance of the I and j ports of the accessible node, I k Is the current matrix of the kth branch, I 0 Is the excitation current, I K ' represents the current matrix of the kth branch after a fault;
the number of the fault equations is the same as that of the ports of the grounding grid, and a mathematical model is established according to the relationship between the Taylor root theorem and the port resistance change and the branch resistance change of the grounding grid.
The method comprises the following steps: and 3, assuming that the grounding resistance of each section of grounding network is bad, and calculating the distribution and resistance of the non-accessible node voltages in the network according to the step length by using the Taylor theorem and kirchhoff law and using different resistance values based on the accessible node voltages acquired in real time, the established grounding network model and the corresponding fault equation.
Step 4: and judging the fault of the grounding network based on the non-accessible node voltage and the resistor of the branch running state so as to determine fault point position information, wherein the fault point position information comprises fault positioning and fault types.
The method comprises the following specific steps:
comparing the non-accessible node resistance with the nominal value of the grounding grid resistance, and determining the corrosion degree of the grounding grid by comparing the resistance change multiples, namely comparing the branch resistance obtained by calculation and analysis with the nominal value according to the Taylor theorem, and judging the corrosion degree, namely judging the fault type;
and (3) performing corresponding voltage-to-voltage comparison between the calculated non-reachable node voltage distribution and the measured reachable node voltage distribution to obtain a corresponding square error, and taking the minimum square error value as fault location, wherein the nominal value of the grounding resistor refers to the resistance value of each section of conductor of the grounding grid under the condition of no corrosion.
Further comprising the step 5: the terminal software platform based on the Internet and the GIS performs visual display on the fault judgment result and the annual data set, and the software platform can control the working state of the intelligent grounding grid detector in real time and control the remote acquisition of data.
A system for acquiring data on-line in real time and implementing ground network fault monitoring, comprising:
and (4) importing a data module: injecting exciting current, and measuring the grounding resistance and the accessible node voltage of a grounding grid in real time by frequency conversion based on a multichannel self-adaptive frequency conversion measurement technology;
and (3) establishing a model module: when the grounding performance of the grounding network is reduced, based on the available node voltage obtained in real time, an established grounding network model and a fault equation, analyzing the resistance change of each branch node of the grounding network by utilizing the theorem related to the electric network theory to obtain the non-available node voltage and resistance for judging the branch running state;
corrosion prediction module: and judging the fault of the grounding network based on the running state of each node and the analyzed change characteristics so as to determine the position information of the fault point and the fault type.
The terminal software platform of the Internet+GIS further comprises a remote control module, a database, a visual alarm and data display module, a data analysis and diagnosis module, a user management module, a report generation module and a data statistics and query module.
The above is merely representative examples of numerous specific applications of the present invention and should not be construed as limiting the scope of the invention in any way. All technical schemes formed by adopting transformation or equivalent substitution fall within the protection scope of the invention.
Claims (9)
1. The method for acquiring data on line in real time and realizing the fault monitoring of the grounding grid is characterized by comprising the following steps:
step 1: injecting exciting current, and measuring the grounding resistance and the accessible node voltage of a grounding grid in real time by frequency conversion based on a multichannel self-adaptive frequency conversion measurement technology; the measurement range of the grounding resistance is 0-1000 ohms, and the measurement accuracy is within 3% +/-2 d.
Step 2: establishing an annual data set of the grounding resistance based on the grounding resistance monitoring data obtained by annual real-time monitoring, carrying out change characteristic analysis of monitoring data, obtaining a result of whether the grounding performance of the grounding network is reduced or not based on the change characteristic, if so, turning to step 3, judging whether the grounding performance of the grounding network reaches an early warning value or not, if so, carrying out state early warning, otherwise, carrying out aging prompt;
step 3: based on the available node voltage obtained in real time, an established grounding network model and a fault equation, analyzing the resistance change of each branch node of the grounding network by utilizing the Taylor theorem and the kirchhoff law to obtain non-available node voltage and resistance for judging the operation state of the branch;
step 4: and judging the fault of the grounding network based on the non-accessible node voltage and the resistor of the branch running state so as to determine fault point position information, wherein the fault point position information comprises fault positioning and fault types.
2. The method for acquiring data on line and monitoring faults of a ground network in real time according to claim 1, wherein the multichannel adaptive variable frequency measurement technology in the step 1 refers to changing the measurement frequency acquisition amplitude of the ground network in a ground resistance measurement working mode and a node voltage measurement working mode, and the frequency range is 40HZ-60HZ.
3. The method for acquiring data on line and realizing fault monitoring of the grounding network according to claim 2, wherein the step 2 is characterized in that the change characteristic and trend are manually analyzed according to the annual data set of the grounding resistance so as to obtain the change characteristic of the corrosion degree of the grounding network for judging the specific fault position of the subsequent grounding network.
4. The method for acquiring data and realizing ground network fault monitoring on line in real time according to claim 3, wherein the ground network model in step 3 is obtained by establishing an equivalent circuit model of the ground network according to the terylen theorem and the electric network theory based on the ground network real structure;
the number of the fault equations is the same as that of the ports of the grounding grid, and a mathematical model is established according to the relationship between the Taylor root theorem and the port resistance change and the branch resistance change of the grounding grid.
5. The method according to claim 4, wherein the step 3 is to assume that the resistance of each section of the grounding network is bad, and calculate the distribution and resistance of the non-accessible node voltages in the network with different resistance values according to step sizes by using the terylen theorem and kirchhoff law based on the accessible node voltages acquired in real time, the established grounding network model and the corresponding fault equations.
6. The method for acquiring data and implementing ground network fault monitoring on-line in real time according to claim 5, wherein the specific steps of step 4 are as follows:
comparing the non-accessible node resistance with the nominal value of the grounding grid resistance, and determining the corrosion degree of the grounding grid by comparing the resistance change multiples, namely comparing the branch resistance obtained by calculation and analysis with the nominal value according to the Taylor theorem, and judging the corrosion degree, namely judging the fault type;
and (3) performing corresponding voltage-to-voltage comparison between the calculated non-reachable node voltage distribution and the measured reachable node voltage distribution to obtain a corresponding square error, and taking the minimum square error value as fault location, wherein the nominal value of the grounding resistor refers to the resistance value of each section of conductor of the grounding grid under the condition of no corrosion.
7. The method for online real-time data acquisition and ground network fault monitoring according to claim 4, further comprising step 5: the terminal software platform based on the Internet + GlS carries out visual display on the fault judgment result and the annual data set, and the software platform can control the working state of the intelligent grounding grid detector in real time and control the remote acquisition of data.
8. A system for acquiring data on-line in real time and implementing ground network fault monitoring, comprising:
and (4) importing a data module: injecting exciting current, and measuring the grounding resistance and the accessible node voltage of a grounding grid in real time by frequency conversion based on a multichannel self-adaptive frequency conversion measurement technology;
and (3) establishing a model module: when the grounding performance of the grounding network is reduced, based on the available node voltage acquired in real time, an established grounding network model and a fault equation, and by utilizing the Taylor theorem and kirchhoff law, the resistance change of each branch node of the grounding network is analyzed, so as to obtain the non-available node voltage and resistance for judging the branch running state:
corrosion prediction module: and judging the fault of the grounding network based on the running state of each node and the analyzed change characteristics so as to determine the position information of the fault point and the fault type.
9. The system for acquiring data on line and monitoring faults of a ground network in real time according to claim 8, wherein the terminal software platform of the internet+gis further comprises a remote control module, a database, a visual alarm and data display module, a data analysis and diagnosis module, a user management module, a report generation module and a data statistics and query module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117725388A (en) * | 2024-02-07 | 2024-03-19 | 国网山东省电力公司枣庄供电公司 | Adjusting system and method aiming at ground fault information |
| CN118091321A (en) * | 2024-03-07 | 2024-05-28 | 河南诺玖电气设备有限公司 | Method and device for detecting corrosion of grounding grid of power transmission line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117725388A (en) * | 2024-02-07 | 2024-03-19 | 国网山东省电力公司枣庄供电公司 | Adjusting system and method aiming at ground fault information |
| CN117725388B (en) * | 2024-02-07 | 2024-05-03 | 国网山东省电力公司枣庄供电公司 | Adjusting system and method aiming at ground fault information |
| CN118091321A (en) * | 2024-03-07 | 2024-05-28 | 河南诺玖电气设备有限公司 | Method and device for detecting corrosion of grounding grid of power transmission line |
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