CN117420393A - Method, system, equipment and storage medium for identifying partial discharge defect of switch cabinet - Google Patents
Method, system, equipment and storage medium for identifying partial discharge defect of switch cabinet Download PDFInfo
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- CN117420393A CN117420393A CN202311142475.XA CN202311142475A CN117420393A CN 117420393 A CN117420393 A CN 117420393A CN 202311142475 A CN202311142475 A CN 202311142475A CN 117420393 A CN117420393 A CN 117420393A
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- 230000007547 defect Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003860 storage Methods 0.000 title claims abstract description 13
- 239000012212 insulator Substances 0.000 claims description 19
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 5
- 238000013528 artificial neural network Methods 0.000 claims description 3
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- 238000007621 cluster analysis Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 15
- 238000003745 diagnosis Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
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- 238000004891 communication Methods 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
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- 230000003287 optical effect Effects 0.000 description 3
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- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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Abstract
The invention relates to a method, a system, equipment and a storage medium for identifying partial discharge defects of a switch cabinet, wherein the method comprises the following steps: step S1, connecting a partial discharge measuring device in parallel to a nuclear phase hole of a charge indicator in a high-voltage switch cabinet, constructing a partial discharge measuring circuit, and collecting a partial discharge pulse current signal of the switch cabinet; and S2, performing defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters. Compared with the prior art, the method for identifying the partial discharge defect of the switch cabinet based on the phase hole detection pulse current of the charge indicator can greatly improve the diagnosis efficiency of the operation state of the switch cabinet, does not need to use an expensive sensor, and greatly saves the cost of the device by only acquiring the signal from the phase hole of the charge indicator configured by the switch cabinet.
Description
Technical Field
The invention relates to the field of detection of discharge defects of switch cabinets, in particular to a method, a system, equipment and a storage medium for identifying partial discharge defects of a switch cabinet.
Background
The high-voltage switch cabinet is important distribution network equipment facing to user power supply, insulation degradation can necessarily exist in an internal insulation part of the switch cabinet in long-term operation, so that the electrical insulation strength is reduced, even faults occur, and the safety of personnel and equipment is threatened. Partial discharge is a main cause of insulation degradation, is also an important sign and expression form of insulation degradation, is closely related to degradation of an insulating material and breakdown process of an insulator, and can practically reflect latent defects and faults of insulation inside equipment. The partial discharge live detection and identification technology can well diagnose the running state and the insulation level of the switch cabinet, effectively improves the running reliability of the switch cabinet, and has important significance for maintaining the safe and stable running of people's production and life and a power grid.
Partial discharge detection technology based on Ultra High Frequency (UHF), ultrasonic (AE) and Transient Earth Voltage (TEV) has been developed for a certain application in the field of partial discharge on-line monitoring, but the detection accuracy and sensitivity in actual operation are doubtful because the frequency band of the partial discharge of a switch cabinet cannot be covered, and the problems of complex installation, high cost, large interference of environmental noise and the like exist.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for identifying the partial discharge defects of a switch cabinet.
The aim of the invention can be achieved by the following technical scheme:
according to a first aspect of the present invention, there is provided a method for identifying partial discharge defects of a switchgear, the method comprising the steps of:
step S1, connecting a partial discharge measuring device in parallel to a nuclear phase hole of a charge indicator in a high-voltage switch cabinet, constructing a partial discharge measuring circuit, and collecting a partial discharge pulse current signal of the switch cabinet;
and S2, performing defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters.
Preferably, the partial discharge measurement circuit in step S1 specifically includes:
each high-voltage switch cabinet is internally provided with a charge indicator, the charge indicator comprises an LED indicator lamp and a nuclear phase hole, a supporting insulator with a voltage dividing capacitor function is arranged below the switch cabinet to supply power, and the charge condition and the nuclear phase service condition of the switch are displayed in real time;
one end of the supporting insulator is connected with high voltage, and the other end of the supporting insulator is connected with a charge indicator, and the supporting insulator is regarded as an insulator coupling capacitor with set capacitance and is used for coupling partial discharge pulse signals in the switch cabinet in real time;
and connecting the partial discharge measuring device in parallel to a nuclear phase hole of a charge indicator in the high-voltage switch cabinet, and collecting a partial discharge pulse current signal of the switch cabinet.
Preferably, the nuclear phase holes of the charge indicator are each connected to an insulator coupling capacitor to provide information on waveforms inside the switchgear.
Preferably, when the nuclear phase Kong Mouyi of the charge indicator is subjected to partial discharge, the generated discharge pulse is coupled to the partial discharge measuring device through the insulator capacitance sensor, and the current signal of the partial discharge pulse of the switch cabinet is detected.
Preferably, the set defect type characteristic statistical parameter in the step S2 includes a maximum intensity value a of each group of partial discharge signals max Average intensity value A ave Sum of discharge amplitudes A total Total number of discharges N, ratio r of number of discharges in positive half cycle to number of discharges in negative half cycle N Ratio r of sum of positive half-cycle discharge signal intensity amplitudes to sum of negative half-cycle discharge signal intensity amplitudes A Average std of standard deviation of discharge amplitude per cycle ave 。
Preferably, each set of partial discharge signals is specifically: and taking the pulse current waveforms of K power frequency periods acquired based on the charge indicator nuclear phase hole as a group of partial discharge signals.
Preferably, the defect identifying method in step S2 includes a mapping method based on radar map, a cluster analysis method, and a neural network algorithm.
According to a second aspect of the present invention, there is provided a system based on the method for identifying partial discharge defects of a switchgear, the system comprising:
the switch cabinet partial discharge pulse current signal acquisition module is used for connecting a partial discharge measuring instrument in parallel to a nuclear phase hole of a charge indicator in the high-voltage switch cabinet, constructing a partial discharge measuring circuit and acquiring a switch cabinet partial discharge pulse current signal;
and the defect identification module is used for carrying out defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters.
According to a third aspect of the present invention there is provided an electronic device comprising a memory and a processor, the memory having stored thereon a computer program, the processor implementing the method of any one of the above when executing the program.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the method of any one of the above.
Compared with the prior art, the invention has the following beneficial effects:
1) According to the invention, the method for identifying the partial discharge defect of the switch cabinet based on the pulse current detection of the charge indicator nuclear phase hole is adopted, the charge indicator configured by the high-voltage switch cabinet is utilized to acquire the pulse current partial discharge information from the charge indicator nuclear phase hole and carry out subsequent defect identification according to the pulse current partial discharge information, so that the diagnosis efficiency of the operation state of the switch cabinet can be greatly improved, the fault rate of the device can be reduced, the reliability of the equipment can be improved, and the safety of personnel and the normal and stable operation of the equipment can be ensured.
2) The charge indicator configured by the high-voltage switch cabinet is utilized to acquire pulse current partial discharge information from the charge indicator nuclear phase hole and perform subsequent defect identification according to the pulse current partial discharge information, a monitoring sensor is not required to be additionally arranged, and the on-line monitoring of the partial discharge of the high-voltage switch can be finally realized.
3) The invention provides 7 set defect type characteristic statistical parameters which have corresponding signal physical characteristics and can reflect the integral characteristic of the periodic discharge, improves the accuracy and efficiency of the diagnosis of the high-voltage switch cabinet by the maintainer, and can save a great amount of manpower and material resources.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a detection loop of the pulse current method;
fig. 3 is a schematic diagram of a detection principle of a partial discharge pulse current of a switch cabinet based on a charge indicator nuclear phase hole;
fig. 4 is a schematic diagram of a parallel circuit of the partial discharge detection device and the phase hole of the charge indicator in the high-voltage switch cabinet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
As shown in fig. 1, the embodiment provides a method for identifying a partial discharge defect of a switch cabinet, which includes the following steps:
step S1, detecting the partial discharge pulse current of a switch cabinet based on a phase hole of a charged indicator: the partial discharge measuring device is connected in parallel to a nuclear phase hole of a charge indicator in the high-voltage switch cabinet, a partial discharge measuring circuit is built, and a partial discharge pulse current signal of the switch cabinet is acquired;
when partial discharge occurs in the high-voltage insulation system, a certain amount of charges pass through the dielectric, and the discharge time is short, which is characterized byThe pulse current is steeper, the pulse current forms a pulse voltage on the detection impedance and can be measured by an instrument, and the basic detection loop of the pulse current method is shown in fig. 2. When sample C x When a partial discharge is generated, the pulse current passes through the coupling capacitor C k At the detection impedance Z d The two ends generate an instantaneous voltage change, namely pulse voltage delta U, which is processed by a partial discharge measuring instrument M to obtain the basic characteristic parameters and the map of partial discharge.
Because of the structure of the switch cabinets, each switch cabinet is provided with an electrified display device. The main structure of the charge indicator comprises an LED indicator lamp and a nuclear phase hole, and is powered by a supporting insulator with a voltage dividing capacitance function, which is arranged below the switch, so that the charge condition and the nuclear phase use of the switch are displayed in real time. The supporting insulator has one end connected to high voltage and one end connected to charge indicator, and may be used as coupling capacitor with certain capacitance. The insulator capacitive coupling sensor is used for coupling partial discharge pulse signals in the switch cabinet in real time, and the partial discharge pulse signals are primarily processed by the pulse acquisition module and then transmitted to the centralized monitoring host through the coaxial cable. The schematic diagram is shown in fig. 3.
The partial pressure display principle of the switch cabinet charged indicator has extremely high similarity with the traditional laboratory partial discharge measurement principle, and the switch cabinet charged display loop can be utilized to couple the primary loop partial discharge pulse signals through the insulator capacitive coupling sensor. The partial discharge detection device is connected in parallel with the phase hole of the charge indicator in the high-voltage switch cabinet, as shown in fig. 4.
Since the nuclear phase holes of the charge indicator are each connected with a capacitance sensor, the capacitance sensor can be used as a coupling capacitor to provide waveform information inside the switch cabinet. As long as partial discharge occurs in a certain phase, the generated discharge pulse is coupled to the partial discharge detection device through the capacitive sensor, so that the current partial discharge information is detected, and the detection of the partial discharge pulse current in the switch cabinet is realized.
And S2, performing defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters.
The present embodiment defines and proposes 7 defect type characteristic statistical parameters having corresponding signal physical characteristics and capable of reflecting the integral characteristic of the periodic discharge.
Firstly, taking pulse current waveforms of 100 power frequency periods acquired based on a charge indicator nuclear phase hole as a group of partial discharge signals, wherein the calculation method of each characteristic is as follows:
A max : the maximum intensity value of each group of partial discharge signals reflects the maximum discharge intensity of the defect and corresponds to the peak value in the discharge map;
A ave : the average intensity value of each group of partial discharge signals reflects the overall discharge intensity;
A total : the sum of the discharge amplitudes of each group of partial discharge signals represents the discharge accumulation intensity of the defect in a period of time, and the information features such as discharge repetition rate and the like are included;
n: the total discharge times of each group of partial discharge signals can reflect the repetition rate of discharge in a certain time;
r N : the ratio of the number of positive half-cycle discharges to the number of negative half-cycle discharges for each set of partial discharge signals;
r A : the ratio of the sum of the discharge signal intensity amplitudes of the positive half cycles and the sum of the discharge signal intensity amplitudes of the negative half cycles of each group of partial discharge signals reflects the shape characteristics of the defects, and the shape characteristics of the positive half cycles and the negative half cycles in the discharge spectrum can be represented because the discharge intensity of the positive half cycles and the negative half cycles of the defects with different shapes are different in one cycle;
std ave : the average value of the standard deviation of the discharge amplitude in each period in each group of partial discharge signals reflects the fluctuation of the discharge amplitude and can reflect the shape characteristics of the amplitude change in the discharge spectrum.
Thus, for example, for 20000 partial discharge signals of a certain defect type, the partial discharge signals may be divided into 200 groups, and 7×200=1400 feature quantities in total are obtained as parameters for defect type identification. The statistical characteristic quantity can better describe the discharge signal statistical characteristic of the defect, has certain physical significance and is related to the actual discharge process and mechanism, and can be used for carrying out subsequent defect type identification, such as drawing parameters of radar map, input parameters of cluster analysis, input quantity of artificial neural network algorithm and the like.
Example 2
The embodiment provides a system based on the method for identifying the partial discharge defect of the switch cabinet, and the system comprises:
the switch cabinet partial discharge pulse current signal acquisition module is used for connecting a partial discharge measuring instrument in parallel to a nuclear phase hole of a charge indicator in the high-voltage switch cabinet, constructing a partial discharge measuring circuit and acquiring a switch cabinet partial discharge pulse current signal;
and the defect identification module is used for carrying out defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters.
The invention provides a method for identifying the partial discharge defects of a switch cabinet based on the pulse current detected by a charge indicator nuclear phase hole, which can acquire the partial discharge pulse current signals of the defects of the switch cabinet and identify the type of the subsequent discharge defects, greatly improve the diagnosis efficiency of the operation state of the switch cabinet, help to reduce the failure rate of a device, further improve the reliability of equipment, and help to ensure the safety of personnel and the normal and stable operation of the equipment.
The invention does not need to use an expensive sensor, but greatly saves the cost of the device by acquiring the signal from the phase hole of the charge indicator configured by the switch cabinet. In addition, the invention also provides a method for extracting and calculating the partial discharge characteristic quantity, which improves the accuracy and efficiency of the diagnosis of the high-voltage switch cabinet by the maintainer and can save a great amount of manpower and material resources.
The electronic device of the present invention includes a Central Processing Unit (CPU) that can perform various appropriate actions and processes according to computer program instructions stored in a Read Only Memory (ROM) or computer program instructions loaded from a storage unit into a Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the device can also be stored. The CPU, ROM and RAM are connected to each other by a bus. An input/output (I/O) interface is also connected to the bus.
A plurality of components in a device are connected to an I/O interface, comprising: an input unit such as a keyboard, a mouse, etc.; an output unit such as various types of displays, speakers, and the like; a storage unit such as a magnetic disk, an optical disk, or the like; and communication units such as network cards, modems, wireless communication transceivers, and the like. The communication unit allows the device to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processing unit performs the respective methods and processes described above, for example, the methods S1 to S2. For example, in some embodiments, methods S1-S2 may be implemented as a computer software program tangibly embodied on a machine-readable medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device via the ROM and/or the communication unit. When the computer program is loaded into RAM and executed by the CPU, one or more steps of the methods S1-S2 described above may be performed. Alternatively, in other embodiments, the CPU may be configured to perform methods S1-S2 by any other suitable means (e.g., by means of firmware).
The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a load programmable logic device (CPLD), etc.
Program code for carrying out methods of the present invention may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The method for identifying the partial discharge defect of the switch cabinet is characterized by comprising the following steps of:
step S1, connecting a partial discharge measuring device in parallel to a nuclear phase hole of a charge indicator in a high-voltage switch cabinet, constructing a partial discharge measuring circuit, and collecting a partial discharge pulse current signal of the switch cabinet;
and S2, performing defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters.
2. The method for identifying partial discharge defects of a switchgear according to claim 1, wherein the partial discharge measurement circuit in step S1 specifically comprises:
each high-voltage switch cabinet is internally provided with a charge indicator, the charge indicator comprises an LED indicator lamp and a nuclear phase hole, a supporting insulator with a voltage dividing capacitor function is arranged below the switch cabinet to supply power, and the charge condition and the nuclear phase service condition of the switch are displayed in real time;
one end of the supporting insulator is connected with high voltage, and the other end of the supporting insulator is connected with a charge indicator, and the supporting insulator is regarded as an insulator coupling capacitor with set capacitance and is used for coupling partial discharge pulse signals in the switch cabinet in real time;
and connecting the partial discharge measuring device in parallel to a nuclear phase hole of a charge indicator in the high-voltage switch cabinet, and collecting a partial discharge pulse current signal of the switch cabinet.
3. A method of identifying a partial discharge defect in a switchgear as claimed in claim 2, wherein the nuclear phase holes of the charge indicator are each connected to an insulator coupling capacitor to provide waveform information within the switchgear.
4. A method for identifying a partial discharge defect of a switchgear according to claim 3, wherein when a partial discharge phenomenon occurs in a nuclear phase Kong Mouyi phase of the charge indicator, a generated discharge pulse is coupled to a partial discharge measuring device through an insulator capacitance sensor, and a current switchgear partial discharge pulse current signal is detected.
5. The method as set forth in claim 1, wherein the set defect type characteristic statistical parameters in the step S2 include a maximum intensity value a of each group of partial discharge signals max Average intensity value A ave Sum of discharge amplitudes A total Total number of discharges N, ratio r of number of discharges in positive half cycle to number of discharges in negative half cycle N Ratio r of sum of positive half-cycle discharge signal intensity amplitudes to sum of negative half-cycle discharge signal intensity amplitudes A And each cycle of discharge amplitudeAverage std of standard deviation of values ave 。
6. The method for identifying partial discharge defects of a switchgear according to claim 5, wherein each group of partial discharge signals comprises: and taking the pulse current waveforms of K power frequency periods acquired based on the charge indicator nuclear phase hole as a group of partial discharge signals.
7. The method for identifying partial discharge defects of a switchgear according to claim 5, wherein the defect identification method in step S2 comprises a drawing method based on radar map, a cluster analysis method, and a neural network algorithm.
8. A system based on the method for identifying partial discharge defects of a switchgear cabinet according to claim 1, characterized in that it comprises:
the switch cabinet partial discharge pulse current signal acquisition module is used for connecting a partial discharge measuring instrument in parallel to a nuclear phase hole of a charge indicator in the high-voltage switch cabinet, constructing a partial discharge measuring circuit and acquiring a switch cabinet partial discharge pulse current signal;
and the defect identification module is used for carrying out defect identification on the partial discharge pulse current signal of the switch cabinet based on the set defect type characteristic statistical parameters.
9. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the processor, when executing the program, implements the method according to any of claims 1-7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1-7.
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| CN202311142475.XA CN117420393A (en) | 2023-09-05 | 2023-09-05 | Method, system, equipment and storage medium for identifying partial discharge defect of switch cabinet |
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| CN202311142475.XA CN117420393A (en) | 2023-09-05 | 2023-09-05 | Method, system, equipment and storage medium for identifying partial discharge defect of switch cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117872068A (en) * | 2024-03-11 | 2024-04-12 | 国电南瑞科技股份有限公司 | Method and system for identifying serious discharge defects in oil immersed equipment |
| CN117872068B (en) * | 2024-03-11 | 2024-05-31 | 国电南瑞科技股份有限公司 | Method and system for identifying serious discharge defects in oil immersed equipment |
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2023
- 2023-09-05 CN CN202311142475.XA patent/CN117420393A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117872068A (en) * | 2024-03-11 | 2024-04-12 | 国电南瑞科技股份有限公司 | Method and system for identifying serious discharge defects in oil immersed equipment |
| CN117872068B (en) * | 2024-03-11 | 2024-05-31 | 国电南瑞科技股份有限公司 | Method and system for identifying serious discharge defects in oil immersed equipment |
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