CN218938409U - GIS equipment withstand voltage test breakdown fault positioning device based on transient magnetic field - Google Patents
GIS equipment withstand voltage test breakdown fault positioning device based on transient magnetic field Download PDFInfo
- Publication number
- CN218938409U CN218938409U CN202222866521.8U CN202222866521U CN218938409U CN 218938409 U CN218938409 U CN 218938409U CN 202222866521 U CN202222866521 U CN 202222866521U CN 218938409 U CN218938409 U CN 218938409U
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- transient
- breakdown fault
- transient magnetic
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Locating Faults (AREA)
Abstract
The utility model relates to a breakdown fault positioning device for a GIS (gas insulated switchgear) device withstand voltage test based on a transient magnetic field, which comprises a plurality of magnetic field sensing devices, a relay transmission device and a data processor, wherein the magnetic field sensing devices are dispersedly arranged on the surface of the GIS device, the relay transmission device is used for transmitting transient magnetic field signals with the magnetic field sensing devices in a wireless mode, and the data processor is connected with the relay transmission device through a network cable; the magnetic field sensing device is used for detecting transient magnetic field signals generated when breakdown faults occur and storing and transmitting the transient magnetic field signals exceeding a threshold value; the relay transmission device is used for receiving and collecting transient magnetic field signals transmitted by the magnetic field sensing device and outputting the transient magnetic field signals; the data processor is used for receiving the transient magnetic field signal and judging the breakdown fault position. Compared with the prior art, the utility model has the advantages of accurate positioning of breakdown fault position, low cost, strong anti-interference capability and the like.
Description
Technical Field
The utility model relates to the field of GIS equipment fault positioning, in particular to a breakdown fault positioning device for a GIS equipment withstand voltage test based on a transient magnetic field.
Background
The Gas-insulated metal-enclosed switchgear (GIS) has the characteristics of small occupied area, small interference from external environment, long maintenance period, small operation and maintenance workload and the like, and the loading amount of the GIS in a power system is continuously increased. However, the GIS equipment has many factors causing internal insulation defects in the processes of transportation, installation and the like, and the alternating current withstand voltage test is a necessary test item for checking whether the insulation performance of the GIS equipment is good or not before handover and operation and verifying whether various fault hidden dangers exist or not according to GIS equipment handover and operation specified in GB 50150-2016 Electrical equipment handover test Standard for Electrical installation engineering.
In field practice, when the GIS equipment has internal defects and discharge breakdown occurs in an alternating current withstand voltage test, the breakdown is completed instantaneously, and because the breakdown energy is smaller, fewer decomposers are generated in the equipment, and the existing decomposer detection instrument cannot detect abnormal decomposers. If the breakdown fault positioning device is not adopted, the method of repeatedly changing the connection mode of the GIS equipment and repeatedly performing the withstand voltage test is often adopted for searching the fault air chamber. Although the method can find out the fault air chamber under a certain condition, the breaker and the isolating switch are repeatedly operated for many times when the wiring mode of GIS equipment is changed, which is time-consuming and labor-consuming, and the insulation performance of other fault-free air chambers is extremely unfavorable and even can cause damage by many times of withstand voltage tests; meanwhile, the method is influenced by GIS equipment structural design, installation arrangement and fault parts, and is difficult to work sometimes.
At present, a breakdown fault positioning device in a GIS equipment alternating current withstand voltage test mainly adopts an ultrasonic positioning principle. The existing GIS equipment ultrasonic breakdown positioning system adopts a wired or wireless transmission mode, and signals acquired by an ultrasonic sensor are accessed to an oscilloscope for display or corresponding central processing equipment for processing analysis through a signal processing module.
However, since the ultrasonic breakdown locating device is susceptible to external sound and vibration interference and has a large difference in characteristics of the ultrasonic sensor, the ultrasonic breakdown locating device has a problem of low reliability found in actual use of the on-site ac withstand voltage test.
Therefore, how to accurately position the fault discharge air chamber when the breakdown fault of the GIS AC withstand voltage test is realized, and the fault discharge air chamber is not interfered by the outside is a technical problem to be solved.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a breakdown fault positioning device for a GIS equipment voltage withstand test based on a transient magnetic field.
The aim of the utility model can be achieved by the following technical scheme:
the fault positioning device comprises a plurality of magnetic field sensing devices which are dispersedly arranged on the surface of GIS equipment, a relay transmission device which transmits transient magnetic field signals in a wireless mode with the magnetic field sensing devices, and a data processor which is connected with the relay transmission device through optical fibers; the magnetic field sensing device is used for detecting transient magnetic field signals generated when breakdown faults occur and storing and transmitting the transient magnetic field signals exceeding a threshold value; the relay transmission device is used for receiving and collecting transient magnetic field signals transmitted by the magnetic field sensing device and outputting the transient magnetic field signals; the data processor is used for receiving the transient magnetic field signal and judging the breakdown fault position.
Further, the magnetic field sensing device comprises a magnetic field sensor, a signal processing module, a data acquisition device, a control chip, a data storage module, a driving power supply and a wireless communication module which are integrally designed; the magnetic field sensor, the signal processing module, the data acquisition device and the control chip are connected in sequence; the control chip is respectively connected with the data storage module, the driving power supply and the wireless communication module.
Further, the magnetic field sensor is a three-dimensional omnidirectional sensor for measuring the magnetic field intensity on a three-dimensional coordinate in a set magnetic field frequency range in real time; the signal processing module is used for amplifying signals and filtering interference signals.
Further, the frequency measurement range of the magnetic field sensor covers 100kHz-100MHz.
Further, the data collector is used for realizing digital sampling of the magnetic field intensity analog signals; the control chip is used for controlling the whole data acquisition process and data storage and carrying out data transmission according to the instruction of the data processor; the data storage module is used for storing data in cooperation with the control chip.
Further, the highest sampling frequency of the digital sampling of the data collector is 100MHz.
Further, the control chip is a high-performance embedded control chip.
Further, the control chip comprises an embedded program; the embedded program comprises a data acquisition program, a control instruction program and a data storage program.
Further, the driving power supply is a battery module for supplying power to the magnetic field sensing device; the wireless communication module is used for communicating with the magnetic field sensing device, the relay transmission device and the data processor and transmitting signals.
Further, the wireless communication module is used for synchronizing the magnetic field sensing devices through wireless signals, so that the magnetic field sensing devices can trigger the sampling process at the same time.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model can effectively acquire the transient magnetic field signal generated when the GIS equipment AC withstand voltage test breaks down, and can accurately position the fault discharge air chamber. And because the value of the transient current usually reaches thousands of times of the normal test current when breakdown fails, and the peak current reaches at least thousands of amperes, the threshold value of the utility model can be set to 100-1000 times of the intensity of the environmental magnetic field, and the anti-interference capability is very strong.
2. The utility model adopts a magnetic field sensor to detect the magnetic field change method generated by fault current, a plurality of magnetic field sensing devices are directly and dispersedly arranged on or near the surface of GIS equipment, a coupling agent is not required to be smeared and a coupling agent is not required to be installed, the magnetic field sensing devices are integrated with the magnetic field sensor, the signal processing module, the data acquisition device, the control chip, the data storage module, the driving power supply and the wireless communication module, and the modules are integrally designed and integrally assembled, thereby being convenient for transportation, storage and use.
3. The magnetic field sensing device is powered by the built-in driving power supply, so that the trouble of wiring of a field power line can be avoided, and interference signals caused by a power supply or a grounding system are reduced.
4. The data acquisition device automatically triggers the acquisition strategy of data storage only after the amplitude of the magnetic field signal exceeds the threshold value, thereby reducing the capacity and the wireless transmission data volume required by the system data storage module and reducing the system cost.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic diagram of a magnetic field sensing device according to the present utility model;
FIG. 3 is a schematic diagram of the working principle of the present utility model;
fig. 4 is a schematic diagram of transient current at the time of breakdown failure according to the present utility model.
The reference numerals in the figures are:
1. the device comprises a magnetic field sensing device 2, a relay transmission device 3, a data processor 4, GIS equipment 5, a magnetic field sensor 6, a signal processing module 7, a data acquisition device 8, a control chip 9, a data storage module 10, a driving power supply 11 and a wireless communication module.
Detailed Description
The utility model will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present utility model, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present utility model is not limited to the following examples.
Examples
When the GIS equipment alternating current withstand voltage test is normally developed, the test current in the conductor of the GIS equipment 4 is generally about 1-10A, when breakdown fault occurs in the withstand voltage process, the high voltage part of the system discharges to the ground, the transient current generally reaches several kiloamperes to several tens of thousands amperes, the frequency of the transient current is generally in the megahertz level, and the duration time is microsecond to millisecond level. This transient current will generate a transient magnetic field, the strength of which is proportional to the current I and inversely proportional to the distance R, i.e. the larger the current the stronger the magnetic field; the closer to the current, the stronger the magnetic strength.
The utility model realizes the accurate positioning of the breakdown fault position by using the transient magnetic field generated by the transient current when the breakdown fault is detected.
As shown in fig. 1, a breakdown fault positioning device for a voltage withstand test of a GIS device based on a transient magnetic field is used for positioning a breakdown fault position in an ac voltage withstand test of a GIS device 4, and the fault positioning system includes:
the magnetic field sensing devices 1 are arranged on the surface of the GIS equipment 4 in a scattered manner and are used for detecting transient magnetic field signals generated when breakdown faults occur, storing signals exceeding a threshold value and transmitting data to the relay transmission device 2 in a wireless manner;
the relay transmission device 2 performs data transmission with all the magnetic field sensing devices 1 in a wireless mode, and receives and gathers signals uploaded by the magnetic field sensing devices 1; is connected with the data processor 3 by a network cable or an optical fiber mode and transmits signals;
the data processor 3 is used for analyzing the magnetic field intensity signals acquired by the system, judging the position of the breakdown fault, and displaying the detected data and the judging result through a man-machine interaction interface.
As shown in fig. 2, the magnetic field sensing device 1 includes a magnetic field sensor 5, a signal processing module 6, a data collector 7, a control chip 8, a data storage module 9, a driving power supply 10 and a wireless communication module 11, which are integrally assembled as a whole unit, so as to facilitate transportation, storage and field use.
The magnetic field sensor 5 is a three-dimensional omni-directional sensor, and can measure the magnetic field intensity on the X axis, the Y axis and the Z axis in real time, and the magnetic field frequency measuring range covers 100kHz-100MHz; the housing of the magnetic field sensor device 1 is marked with an X-axis positive direction, a Y-axis positive direction, and a Z-axis positive direction with reference to the three-dimensional coordinates of the magnetic field sensor 5.
The main function of the signal processing module 6 is signal amplification and filtering, and low-frequency and high-frequency interference signals outside the frequency range of 100KHz-100MHz are filtered.
The data collector 7 realizes the digital sampling of the magnetic field intensity analog signals, and the highest sampling frequency is 100MHz.
The control chip 8 is a high-performance embedded control chip arranged in the magnetic field sensing device 1, and the embedded program mainly comprises a data acquisition program, a control instruction program, a data storage program and the like; the control chip controls 8 the whole data acquisition process, stores the data result in the magnetic field sensing device 1 in real time, and transmits the data according to the instruction of the data processor 3.
The data storage module 9 is used for storing detection data in cooperation with the control chip 8.
The driving power supply 10 supplies power to the magnetic field sensing device 1, and the built-in rechargeable battery is used for supplying power to avoid trouble of on-site power line wiring, and meanwhile, the magnetic field sensing device 1 is kept isolated from a grounding loop and a power loop, so that the influence of coupling capacitance and inductance between the magnetic field sensing device 1 and the power loop on the working reliability of the device is avoided.
The wireless communication module 11 is used for communicating with the relay transmission device 2, uploading detection data to the data processor 3, and transmitting instructions of the data processor 3 to each magnetic field sensing device 1; the wireless communication module 11 also synchronizes the magnetic field sensing devices 1 through wireless signals, so that a plurality of magnetic field sensing devices 1 can trigger a sampling process simultaneously, the synchronism of a data acquisition channel is ensured, and the data can be conveniently compared and analyzed.
As shown in fig. 3 and 4, the present utility model operates by comprising the steps of:
1) Starting the magnetic field sensing device 1, the relay transmission device 2 and the data processor 3, completing clock synchronization, starting the test, and executing the step 2); at this time, the control chip 8 in the magnetic field sensing device 1 controls the relevant modules to continuously work;
2) The magnetic field sensor 5 detects magnetic field intensity signals in a space in real time, the signals are continuously and digitally collected by the data collector 7 after passing through the signal processing module 6, and the signals are temporarily stored in an internal memory of the control chip 8 in a data stream mode, and the step 3) is executed;
3) The control chip 8 judges the signal amplitude in real time, if the magnetic field signal amplitude does not exceed the threshold value, judging whether the withstand voltage experiment is finished, if not, executing the step 2), and if so, executing the step 5); if the amplitude of the magnetic field signal exceeds the threshold value, executing the step 4); because the value of the transient current generally reaches thousands of times of the normal test current and the peak current at least reaches thousands of amperes when the breakdown fault occurs, the threshold value is generally set to be 100-1000 times of the intensity of the environmental magnetic field, and the anti-interference capability is very strong;
4) The control chip 8 starts a data storage process, stores a data stream signal into the data storage module 9, and executes the step 5); the system adopts a collection strategy which is triggered and stored, the data collector 7 continuously performs data collection, but only when the signal amplitude is larger than a set threshold value, the data storage function is started, so that the system finally obtains an effective data result, and the system storage and data transmission pressure is reduced;
5) The data processor reads the data stored in each magnetic field sensing device through the relay transmission device;
6) After receiving the data, the data processor 3 calculates the magnetic field vector direction according to the detection values in the directions of the X axis, the Y axis and the Z axis, and then judges the breakdown fault position according to the set judgment logic.
The judging logic specifically comprises the following steps: when breakdown fault occurs, the directions of current flowing in conductors of the GIS equipment 4 at two ends of the breakdown fault position are basically opposite (the included angle of current vectors is larger than 90 °), so that the directions of magnetic field vectors in spaces at two ends of the breakdown fault position are basically opposite (the included angle of the magnetic field vectors is larger than 90 °); when the relative placement positions and directions of the magnetic field sensing devices 1 are consistent, the directions of magnetic field vectors detected by different magnetic field sensing devices 1 at two ends of the breakdown fault position are basically opposite (the included angle of the magnetic field vectors is larger than 90 °); therefore, the breakdown fault position is positioned between two adjacent magnetic field sensing devices 1 with the included angle of the magnetic field vectors being larger than 90 degrees, so that the accurate positioning of the breakdown fault position is realized. Because the capacitance and inductance values of the two-side GIS devices 4 are generally inconsistent with each other by taking the breakdown fault position as a reference, the transient current flowing to the breakdown fault points at the two ends of the GIS device are different, so that the absolute values of the magnetic field intensities detected by the adjacent magnetic field sensing devices 1 at the two ends of the breakdown fault position are generally obviously different, and the breakdown fault air chamber can be further judged through the assistance of the difference of the absolute values of the magnetic field intensities.
Before the breakdown fault position is located by the method, the positive direction of the GIS equipment 4 needs to be determined by taking the voltage applying side of the withstand voltage test equipment as a reference, namely, the direction of the test current flowing from the power supply side to the tail end of the sample is the positive direction of the GIS equipment 4. Then, the magnetic field sensing devices 1 are distributed and arranged on the GIS device 4, and are generally placed on the upper portion of the surface of the GIS device 4, and note that the placement directions of all the magnetic field sensing devices 1 need to be consistent, and the positive direction of the X axis of the magnetic field sensor 5 in the magnetic field sensing device 1 is generally consistent with the positive direction of the GIS device 4 based on the positive direction of the X axis marked on the device.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The breakdown fault positioning device for the GIS equipment voltage withstand test based on the transient magnetic field is used for positioning the breakdown fault position during the GIS equipment (4) alternating current voltage withstand test and is characterized by comprising a plurality of magnetic field sensing devices (1) which are dispersedly arranged on the surface of the GIS equipment (4), a relay transmission device (2) which is used for transmitting transient magnetic field signals in a wireless mode with the magnetic field sensing devices (1) and a data processor (3) which is connected with the relay transmission device (2) through optical fibers; the magnetic field sensing device (1) is used for detecting transient magnetic field signals generated when breakdown faults occur and storing and transmitting the transient magnetic field signals exceeding a threshold value; the relay transmission device (2) is used for receiving and collecting transient magnetic field signals transmitted by the magnetic field sensing device (1) and outputting the transient magnetic field signals; the data processor (3) is used for receiving the transient magnetic field signals and judging the breakdown fault positions.
2. The transient magnetic field-based GIS equipment withstand voltage test breakdown fault positioning device according to claim 1 is characterized in that the magnetic field sensing device (1) comprises a magnetic field sensor (5), a signal processing module (6), a data collector (7), a control chip (8), a data storage module (9), a driving power supply (10) and a wireless communication module (11) which are integrally designed; the magnetic field sensor (5), the signal processing module (6), the data acquisition device (7) and the control chip (8) are connected in sequence; the control chip (8) is respectively connected with the data storage module (9), the driving power supply (10) and the wireless communication module (11).
3. The transient magnetic field-based breakdown fault positioning device for the GIS equipment withstand voltage test according to claim 2, wherein the magnetic field sensor (5) is a three-dimensional omnidirectional sensor for measuring the magnetic field intensity on a three-dimensional coordinate within a set magnetic field frequency range in real time; the signal processing module (6) is used for amplifying signals and filtering interference signals.
4. A breakdown fault locating device for a transient magnetic field based voltage withstand test of a GIS device according to claim 3, wherein the frequency measuring range of the magnetic field sensor (5) covers 100kHz-100MHz.
5. A breakdown fault locating device for a transient magnetic field-based voltage withstand test of a GIS device according to claim 3, wherein the data collector (7) is a data collector for realizing digital sampling of a magnetic field strength analog signal; the control chip (8) is used for controlling the whole data acquisition process and data storage and carrying out data transmission according to the instruction of the data processor (3); the data storage module (9) is used for storing data in cooperation with the control chip (8).
6. The transient magnetic field-based breakdown fault positioning device for the GIS equipment voltage withstand test of claim 5, wherein the highest sampling frequency of digital sampling of the data collector (7) is 100MHz.
7. The transient magnetic field-based GIS equipment withstand voltage test breakdown fault positioning device according to claim 5, wherein the control chip (8) is a high-performance embedded control chip.
8. The device for positioning breakdown fault of GIS equipment voltage withstand test based on transient magnetic field according to claim 7, wherein the control chip (8) comprises an embedded program; the embedded program comprises a data acquisition program, a control instruction program and a data storage program.
9. The transient magnetic field-based GIS equipment withstand voltage test breakdown fault positioning device according to claim 5, wherein the driving power supply (10) is a battery module for supplying power to the magnetic field sensing device (1); the wireless communication module (11) is used for communicating with the magnetic field sensing device (1), the relay transmission device (2) and the data processor (3) and transmitting signals.
10. The device for positioning breakdown fault of GIS equipment voltage withstand test based on transient magnetic field according to claim 9, wherein the wireless communication module (11) is used for synchronizing the magnetic field sensing devices (1) through wireless signals, so that the plurality of magnetic field sensing devices (1) can trigger the sampling process at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222866521.8U CN218938409U (en) | 2022-10-30 | 2022-10-30 | GIS equipment withstand voltage test breakdown fault positioning device based on transient magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222866521.8U CN218938409U (en) | 2022-10-30 | 2022-10-30 | GIS equipment withstand voltage test breakdown fault positioning device based on transient magnetic field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218938409U true CN218938409U (en) | 2023-04-28 |
Family
ID=86083679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222866521.8U Active CN218938409U (en) | 2022-10-30 | 2022-10-30 | GIS equipment withstand voltage test breakdown fault positioning device based on transient magnetic field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218938409U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074888A (en) * | 2023-10-11 | 2023-11-17 | 国网天津市电力公司电力科学研究院 | Method, device and equipment for breakdown location detection of electrical equipment |
-
2022
- 2022-10-30 CN CN202222866521.8U patent/CN218938409U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074888A (en) * | 2023-10-11 | 2023-11-17 | 国网天津市电力公司电力科学研究院 | Method, device and equipment for breakdown location detection of electrical equipment |
| CN117074888B (en) * | 2023-10-11 | 2024-01-26 | 国网天津市电力公司电力科学研究院 | Method, device and equipment for breakdown location detection of electrical equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103197215B (en) | GIS AC voltage withstand test discharge fault positioning system and method | |
| CN106771933A (en) | Power cable shelf depreciation high frequency electric monitoring system based on wireless network | |
| CN103293443A (en) | Overhead wire grounding fault locating method for power distribution network | |
| CN111856224A (en) | Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet | |
| CN102749557A (en) | Partial discharging detecting device of switch cabinet | |
| CN218938409U (en) | GIS equipment withstand voltage test breakdown fault positioning device based on transient magnetic field | |
| CN102937675A (en) | Real-time data collecting and fault positioning system of power distribution network and working method thereof | |
| CN105467241A (en) | A distributed converter transformer direct current bias detection system and a detection method thereof | |
| CN106841810A (en) | Insulator detector | |
| CN115508679A (en) | GIS equipment breakdown fault positioning system and method based on transient magnetic field | |
| CN105759187A (en) | Combined electric apparatus partial discharge multi-information fusion diagnostic device | |
| CN107884737B (en) | Wireless high-precision synchronous on-site capacitive equipment on-line monitoring and checking system and method | |
| CN211452424U (en) | Electrified detecting system based on multiple wireless sensors | |
| CN112782540A (en) | High-voltage cable on-line monitoring and fault point positioning device | |
| CN201628754U (en) | Wideband partial discharge detection device for power equipment | |
| CN202770952U (en) | Partial discharge detection device of switch cabinet | |
| CN203658521U (en) | Mobile insulation supervision instrument of transformer station DC system | |
| CN112763873A (en) | Acoustic-electric combined transformer partial discharge identification and positioning device and method | |
| CN115508614B (en) | Airborne non-contact type high-voltage electricity testing method and system | |
| CN103675613B (en) | Transformer station DC system movable type insulation supervision instrument | |
| CN207007993U (en) | A kind of measuring device with electricity of partial discharge of transformer | |
| CN114910759A (en) | Miniaturized partial discharge inspection positioning method and device | |
| CN209606560U (en) | A kind of GIS ac voltage withstanding test breakdown positioning testing system | |
| CN219533311U (en) | Distribution network cable comprehensive monitoring and accurate positioning system based on ring main unit | |
| CN216209630U (en) | Pressure wave device for detecting partial discharge of cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |