CN110988627A - Ultraviolet on-line remote real-time monitoring device for abnormal discharge of power transmission and transformation equipment - Google Patents
Ultraviolet on-line remote real-time monitoring device for abnormal discharge of power transmission and transformation equipment Download PDFInfo
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- 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
- G01R31/1218—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 using optical methods; using charged particle, e.g. electron, beams or X-rays
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Abstract
The ultraviolet online remote real-time monitoring device for abnormal discharge of the power transmission and transformation equipment comprises an ultraviolet sensor, an AD circuit, an MCU unit and a wireless transmission module, wherein the ultraviolet sensor is connected to the AD circuit; moreover, the photovoltaic power supply is respectively connected to the ultraviolet sensor, the AD circuit, the wireless transmission module, the MCU unit and the photovoltaic power supply; the photoelectric current signal of the ultraviolet sensor is subjected to digital integral operation, detection data are subjected to integral sampling and AD conversion, and according to the sampling frequency and the sampling threshold value set by the MCU unit, the sampling data are transmitted to a background system through a wireless module and are sent to a background through various wireless transmission protocols for real-time detection; through the low-power consumption design of low integration, the early warning of trouble is realized to intelligence, to the long-range real-time supervision of electrical equipment abnormal discharge, the safe operation of guarantee on-line equipment. The automatic detection device has the advantages of high automation degree, high response speed and high detection efficiency, does not need manual field operation, and greatly reduces the operation cost of the power equipment.
Description
Technical Field
The invention belongs to a test device for IPC classification G01R31/00 electric performance or a detection device for electric faults, relates to the technical field of abnormal discharge detection of electric power equipment, and particularly relates to an ultraviolet online monitoring device for abnormal discharge of outdoor power transmission and transformation equipment.
Background
With the continuous growth of power transmission lines, the traditional manual line inspection mode is not more and more suitable for the requirements of power transmission line safety and power supply reliability. Under the action of long-term electric, thermal, mechanical and environmental factors, the electric transmission and transformation equipment can have the phenomena of reduced insulating property, structural defects, corona discharge, surface partial discharge and the like. The corona discharge detection is carried out on the electrical equipment, so that the potential degradation conditions can be mastered in time, accidents can be avoided, and the method has important significance for realizing intelligent fault diagnosis and state maintenance of the electrical equipment.
According to incomplete statistics, the electric energy consumed by the discharge of the transmission line in China per year reaches 20.5 hundred million kilowatt-hours. In addition, when the power transmission line discharges, the phenomena of light, sound, heat and the like which are mainly distributed in an ultraviolet band of 230 nm-405 nm are generated, strong pulse electromagnetic waves are also generated, and further, great interference is generated on radio and high-frequency communication.
At present, the patent literature discloses relevant detection techniques and devices:
chinese patent application 201510007194.2 relates to a scanning formula equipment of blind transformer substation all day arc discharge and pollution flashover discharge on-line monitoring device, its characterized in that includes image acquisition front end, image signal transmission link and supervisory control computer, the image acquisition front end includes ultraviolet imager and electronic cloud platform, and ultraviolet imager is 1 at least, and the bottom of ultraviolet imager is installed on electronic cloud platform, and ultraviolet imager, electronic cloud platform pass through the image signal transmission link and are connected with the supervisory control computer. The invention applies the ultraviolet imager method to the online monitoring of the transformer substation equipment, and realizes the all-weather automatic monitoring of the transformer substation equipment.
The chinese patent application 201410567056.5 provides a system and a method for measuring the discharge intensity of power transmission and transformation equipment, which includes: a discharge device for simulating discharge; a pulse voltage generator for outputting pulse voltages of different charge amounts to the discharge device and discharging the discharge device; the voltage generator is used for outputting different voltages to the discharge device and enabling the discharge device to discharge with different discharge intensities; the ultraviolet discharge detector is used for detecting and outputting the ultraviolet photon number of the discharge device under different discharge intensities and the ultraviolet photon number discharged by the power transmission and transformation equipment; the oscilloscope is used for acquiring and outputting a pulse voltage waveform acquired when the discharging device discharges and a discharging pulse voltage waveform acquired when the voltage output by the voltage generator enables the discharging device to discharge; the processor is used for judging the discharge intensity and the discharge amount of the power transmission and transformation equipment, can accurately and quantitatively determine the discharge amount and the discharge intensity of the power transmission and transformation equipment, provides objective judgment basis for technicians, and guides the technicians to accurately analyze the operation state of the power transmission and transformation equipment.
In summary, in the related art, there are three detection methods for abnormal discharge of power equipment, which generally produce light, sound and heat phenomena in the abnormal discharge: (1) ultraviolet imaging method. By using the array type ultraviolet light sensor device, the ultraviolet light generated by abnormal discharge can be imaged and analyzed. Although the discharge condition of the power equipment can be intuitively detected, the price of the ultraviolet imaging equipment is too high, and the ultraviolet imaging equipment is difficult to widely popularize and use in the power department. (2) And (4) ultrasonic detection. The annihilation process of the electric arc in the discharge process is accompanied by the generation of sound wave, and the fault location can be carried out by using ultrasonic waves, however, the method has certain defects: firstly, the sensitivity of sound wave detection is not good as light waves and electromagnetic waves, and secondly, the detection distance and the positioning range are limited because the ultrasonic waves are attenuated quickly when propagating in the air. (3) Infrared imaging method. The infrared imaging detection is widely applied, but the infrared imaging method can detect the partial discharge until the heating fault occurs. Obviously, the infrared detection method has a certain time lag for detecting the fault, which is not beneficial for the power department to find the abnormal discharge fault as early as possible and process the abnormal discharge fault as early as possible.
Disclosure of Invention
The invention aims to provide an ultraviolet online remote real-time monitoring device for abnormal discharge of power transmission and transformation equipment, which solves the technical problems of high cost and low sensitivity of the conventional abnormal discharge detection of outdoor power equipment, can work online all the year round, and accurately monitors the abnormal discharge condition of the power transmission and transformation equipment in an outdoor environment in real time.
The aim of the invention is achieved by the following technical measures: the method comprises the following steps: the device comprises an ultraviolet sensor, an AD circuit, a wireless transmission module, an MCU unit and a photovoltaic power supply; the ultraviolet sensor is connected to the AD circuit, the AD circuit is simultaneously connected to the MCU unit and the wireless transmission module, and the MCU unit is connected to the wireless transmission module; moreover, the photovoltaic power supply is respectively connected to the ultraviolet sensor, the AD circuit, the wireless transmission module, the MCU unit and the photovoltaic power supply; the photoelectric current signal of the ultraviolet sensor is subjected to digital integral operation, detection data are subjected to integral sampling and AD conversion, and according to the sampling frequency and the sampling threshold value set by the MCU unit, the sampling data are transmitted to a background system through a wireless module and are sent to a background through various wireless transmission protocols for real-time detection; the power equipment abnormal discharge ultraviolet signal detected by the ultraviolet sensor is sampled by the AD circuit and is sent to the background management system by the wireless transmission module, the wireless transmission module adopts the common LORA or 433M of the power system, is butted with the base station by a user-specified wireless interface protocol mode, and is finally transmitted to the wireless base station by the wireless transmission module through a wireless communication network.
Particularly, a solar blind type semiconductor single-tube ultraviolet detector adopted by the ultraviolet sensor performs fixed-point, directional and long-distance (2m-50m) real-time tracking detection on corona discharge of equipment in an ultraviolet band, the working wavelength is less than 280nm, the ultraviolet sensor works in a current analog quantity acquisition mode, and a section of frequency spectrum avoids the ultraviolet band of sunlight and is a solar blind area of the sunlight.
In particular, an analog quantity acquisition scheme is adopted for an ultraviolet detector of the ultraviolet sensor.
Particularly, the AD circuit comprises an AD conversion and signal processing circuit, and generates a digital signal according to a certain sampling frequency by performing digital integration operation on a photocurrent signal of the ultraviolet sensor; the AD circuit sampling frequency and threshold value are judged, and the AD circuit is selected through a large number of tests according to user specifications and relates to the effectiveness of sending background data; the data meeting the threshold value is transmitted to the background system through the wireless module; and the AD processing unit considers that the data sent by the sensor is interference or noise, discards the data and does not send the data to the wireless transmission module any more when the data is greater than or less than the threshold value.
Particularly, the wireless transmission module is configured with a plurality of low-power consumption transmission protocols including LORA, 433M, BLE, Nb _ IoT and Zigbee, so as to realize real-time online transmission of data; the wireless transmission module adopts a low-power consumption wireless module, transmits data to a wireless base station with a distance of not more than 500 meters, and uploads the data to a background system through a wireless private network; the working voltage of the wireless transmission module is 3V, the working current is 12mA, and the sleep mode current is 0.1 mA.
In particular, the MCU unit selects 1Hz/s as the sampling frequency.
Particularly, the MCU unit controls the working and sleeping time of all modules, and sets sleeping parameters according to the proportion of working 0.01S in a 1S period.
Particularly, the MCU power management system controls the power supply system to switch among photovoltaic power supply, lithium battery power supply and lithium battery charging working modes.
The invention has the advantages and effects that: through the design of low integration low-power consumption, to the long-range real-time supervision of power equipment abnormal discharge, the early fault of discovery equipment in time avoids the emergence of production accident, realizes the early warning to the trouble, accurate measurement and intelligent perception, and degree of automation is high, and the installation is maintained simply, convenient to use, and response speed is fast, and detection efficiency is high, need not artifical field operation, reduces power equipment's operation cost by a wide margin, has reduced intensity of labour moreover, and the combined cost greatly reduces.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention.
FIG. 2 is a view showing the construction of the installation of the apparatus of the present invention.
FIG. 3 is a graph of the spectral response interval of the UV detector of the present invention.
Fig. 4 is a connection relation diagram of the photovoltaic power module.
Detailed Description
The principle of the invention is that photocurrent signals of an ultraviolet sensor are subjected to digital integral operation, detection data are subjected to integral sampling and AD conversion, and the sampling data are transmitted to a background system through a wireless module according to sampling frequency and sampling threshold set by an MCU (microprogrammed control Unit) and are transmitted to a background through various wireless transmission protocols for real-time detection. Through big data analysis, early warning of faults is intelligently achieved, and safe operation of on-line equipment is guaranteed.
In the invention, the device for monitoring the abnormal discharge of the power transmission and transformation equipment on line by ultraviolet in outdoor environment mainly comprises the following components: the device comprises unit modules such as an ultraviolet sensor, an AD circuit, a wireless transmission module, an MCU unit and a photovoltaic power supply. As shown in fig. 1, the ultraviolet sensor is connected to an AD circuit, the AD circuit is connected to the MCU unit and the wireless transmission module at the same time, and the MCU unit is connected to the wireless transmission module; and the photovoltaic power supply is respectively connected to the ultraviolet sensor, the AD circuit, the wireless transmission module, the MCU unit and the photovoltaic power supply.
In the foregoing, the power equipment abnormal discharge ultraviolet signal detected by the ultraviolet sensor is sampled by the AD circuit and sent to the background management system by the wireless transmission module, the wireless transmission module adopts the common LORA or 433M of the power system, and is in butt joint with the base station by a user-specified wireless interface protocol mode, and finally, the wireless transmission module transmits the signal to the wireless base station through the wireless communication network.
The invention is further illustrated by the following figures and examples.
Example 1: as shown in fig. 2, the high-voltage cable is suspended and installed on the high-voltage tower through an insulator, and the angle steel is used as a support structure of the device and fixed on the high-voltage tower.
In the embodiment of the invention, the solar blind type semiconductor single-tube ultraviolet detector adopted by the ultraviolet sensor performs fixed-point, directional and long-distance (2-50 m) real-time tracking detection on corona discharge of equipment in an ultraviolet band, the working wavelength is less than 280nm, the ultraviolet solar blind detector has good ultraviolet solar blind characteristic, and meanwhile, the detector has the characteristics of large forbidden bandwidth, high electronic drift saturation speed, low dark current, high working temperature and the like, and is an ultraviolet detection device with excellent performance. The ultraviolet sensor works in a current analog quantity acquisition mode instead of simple electronic counting statistics, so that the generated data is beneficial to performing characteristic analysis on abnormal discharge and accurately judging the fault level. The spectral response interval of the detector of the ultraviolet sensor is shown in fig. 3. When the power transmission equipment discharges, ultraviolet light, that is, electromagnetic waves in an ultraviolet band are radiated, and the following is found by analyzing the spectrum of the ultraviolet light: one section of the frequency spectrum avoids the ultraviolet band of sunlight and is the solar blind area of the sunlight. Compared with an expensive array detector, the cost of the single-tube detector is greatly reduced.
In the embodiment of the invention, the wireless transmission module selects a low-power-consumption wireless module, the photovoltaic power supply module ensures energy supply of the device under the perennial outdoor environment, and the MCU is communicated with the background and intelligently controls all module circuits. The MCU unit is the brain of the whole device and intelligently manages and controls all the module circuits. The ultraviolet detector adopts an analog quantity acquisition scheme, and is more suitable for an AD circuit to perform sampling processing and data judgment compared with an electronic counting scheme.
In the embodiment of the invention, the AD circuit comprises an AD conversion and signal processing circuit, and generates a digital signal according to a certain sampling frequency by performing digital integration operation on a photocurrent signal of the ultraviolet sensor. The AD circuit sampling frequency and threshold value are judged and selected through a large number of tests according to user specifications, and the effectiveness of sending background data is related. A reasonable sampling frequency and a sampling threshold value are set through the MCU, and all data meeting the threshold value are transmitted to the background system through the wireless module; and the AD processing unit considers that the data sent by the sensor is interference or noise, discards the data and does not send the data to the wireless transmission module any more when the data is greater than or less than the threshold value.
In the embodiment of the invention, the wireless transmission module can flexibly configure various low-power consumption transmission protocols to realize real-time online transmission of data. In the power system, wireless transmission protocols such as LORA, 433M, BLE, Nb _ ioT, Zigbee are all applied. The two wireless modules, LORA and 433M, are more common in consideration of the security requirements of the power grid operation on wireless transmission. The general wireless transmission module transmits data to a wireless base station with a distance of not more than 500 meters, and uploads the data to a background system through a wireless private network.
In the embodiment of the invention, the MCU unit adopts a low-power consumption MCU chip which comprises an A/D conversion and signal processing circuit. The MCU unit is the brain of the whole device, and intelligent control over all the module units is achieved. The signal processing circuit carries out digital integration operation on photocurrent signals of the sensor, the MCU unit selects 1Hz/S as sampling frequency, and controls working and sleeping durations of all modules in order to reduce the power consumption of the whole device, and sleeping parameters are set according to the proportion of 0.01S of working in a 1S period.
In the embodiment of the invention, the wireless transmission module adopts a low-power consumption wireless module product, and the connection distance between the wireless transmission module and the wireless base station is generally not more than 500 meters. The power consumption of the wireless transmission module is relatively large compared with other modules. The working voltage is 3V, the working current is 12mA, the sleep mode current is 0.1mA, and the average working current is 0.11mA calculated according to the sampling period of 1S and the working time of 0.01S.
In the embodiment of the invention, a photovoltaic power supply guarantees energy supply in an outdoor environment, and a photovoltaic power supply module consists of a photovoltaic solar panel, a lithium battery and a power management system. The photovoltaic power module consists of a photovoltaic solar panel, a lithium battery and a power management system, and under the management control of the MCU, the energy supply of the whole ultraviolet monitoring device is ensured.
In the embodiment of the invention, the MCU power management system controls the power supply system to flexibly switch among different working modes such as photovoltaic power supply, lithium battery charging and the like, as shown in figure 4. Wherein, the specification capacity of photovoltaic solar panel and lithium cell will be rationally selected according to the power consumption and the continuous operating time of device. Under the management control of the MCU, the energy supply of the whole ultraviolet monitoring device is ensured. The specification and capacity of the photovoltaic solar panel and the lithium battery are reasonably selected according to the power consumption and the continuous working time of the device. The MCU power management system is composed of a low-power consumption MCU chip, is the brain of the whole device, and realizes intelligent control of all module units. On one hand, the MCU accurately controls the sampling frequency and the threshold value of the AD circuit through an internal clock; in addition, the MCU controls the working/sleeping time of all modules so as to ensure the lowest working power consumption of the whole device; the MCU is also responsible for communicating with a background system to realize remote control of the device. The MCU power management system adopts an Energy Harvesting (Energy Harvesting) power management chip.
In embodiments of the invention, it is not practical to directly power the device with only a solar cell, since the intensity of sunlight is always changing, which has a direct impact on the maximum available current. The method for solving the problem is simple, the lithium battery is used as an intermediate energy storage device, when the sunlight is sufficient, the battery is charged by solar energy and then supplies stable power to the load, and when the sunlight is insufficient, the battery directly supplies power to the load.
In the embodiment of the invention, the parameters of the photovoltaic power supply equipment are selected as follows:
1) the daily power consumption of the load. Assuming that the average power consumption of the entire device is 1mA (including sleep), the power consumption for 1 day is 3V × 0.001A × 24 hours — 0.072 Wh.
2) And selecting the storage battery. Assuming that a 3V lithium battery is used, the maximum depth of discharge is 60%, and considering that a fully charged battery can be continuously used for 30 days in rainy days without the sun, the required battery capacity is 0.072Wh × 30 ÷ 3V ÷ 60% ═ 1.2 Ah.
3) And calculating the power of the solar panel. The solar panel has output power consumption of 0.072Wh 30/3/6 h/70% -1.71W, considering the charging efficiency and the loss in the charging process, and the battery is charged for 3 days, and the usage amount of the equipment can be ensured for 30 days. 70% of which is the actual power used by the solar panel during charging. In addition, the sunshine duration is different in each region, and the correction can be properly carried out.
In the embodiment of the invention, the device adopts an integrated shell structure. The shell is made of waterproof, dustproof and explosion-proof engineering plastics or aluminum alloy materials, meets the protection grade IP65, and ensures the service life of more than 10 years. Except that solar cell panel is external, all unit modules such as ultraviolet sensor, AD signal processing, wireless transmission module and antenna, MCU unit and lithium cell and power management system set up in the device casing. The device has a simple and convenient structure, can flexibly select the installation position on the power transmission tower, and simultaneously can randomly adjust the direction of the sensor, thereby satisfying the real-time online monitoring of the abnormal discharge of the insulator of the power transmission tower.
In the embodiment of the invention, the device works online all year round, monitors the abnormal discharge condition of the power transmission and transformation equipment in the outdoor environment in real time, realizes early warning and ensures the safe and stable operation of the power equipment on the grid; in addition, the device is simple to install and maintain, manual field operation is not needed, and the comprehensive cost is greatly reduced. The working condition of the on-line operation power equipment can be sensed accurately and intelligently in real time, the problems of poor real-time performance, high cost and the like caused by manual detection are solved, and the construction requirement of the ubiquitous power internet of things is met.
In the embodiment of the invention, the method is obviously superior to the prior method: firstly, the cost is greatly reduced by adopting a low-cost single-tube solar-blind type semiconductor ultraviolet detector compared with an ultraviolet array imaging detector. Secondly, compared with the infrared imaging technology, the method can realize measurement in the early stage of abnormal discharge of the power transmission and transformation equipment, can find faults earlier, and strives for precious time for maintenance of the power department. And thirdly, online measurement and wireless transmission are carried out, and the requirement of remote real-time monitoring is met. And fourthly, the low-power consumption and integrated design is adopted, so that the installation and maintenance are convenient, and the environmental adaptability requirement of the outdoor operation throughout the year is ensured. According to the invention, through remote monitoring and accurate measurement of abnormal discharge of the power transmission line insulator, early warning of faults is realized, and the operation cost of power equipment is greatly reduced.
The embodiments described above are only a part of the embodiments of the present invention, and based on the embodiments of the present invention, any modification, equivalent replacement, improvement, etc. made by those skilled in the art without any creative effort, and all other embodiments obtained, belong to the protection scope of the present invention.
Claims (8)
1. The online remote real-time monitoring device of ultraviolet of power transmission and transformation equipment abnormal discharge which characterized in that includes: the device comprises an ultraviolet sensor, an AD circuit, a wireless transmission module, an MCU unit and a photovoltaic power supply; the ultraviolet sensor is connected to the AD circuit, the AD circuit is simultaneously connected to the MCU unit and the wireless transmission module, and the MCU unit is connected to the wireless transmission module; moreover, the photovoltaic power supply is respectively connected to the ultraviolet sensor, the AD circuit, the wireless transmission module, the MCU unit and the photovoltaic power supply; the photoelectric current signal of the ultraviolet sensor is subjected to digital integral operation, detection data are subjected to integral sampling and AD conversion, and according to the sampling frequency and the sampling threshold value set by the MCU unit, the sampling data are transmitted to a background system through a wireless module and are sent to a background through various wireless transmission protocols for real-time detection; the power equipment abnormal discharge ultraviolet signal detected by the ultraviolet sensor is sampled by the AD circuit and is sent to the background management system by the wireless transmission module, the wireless transmission module adopts the common LORA or 433M of the power system, is butted with the base station by a user-specified wireless interface protocol mode, and is finally transmitted to the wireless base station by the wireless transmission module through a wireless communication network.
2. The ultraviolet online remote real-time monitoring device for abnormal discharge of the power transmission and transformation equipment as claimed in claim 1, characterized in that a solar blind type semiconductor single tube ultraviolet detector is adopted by the ultraviolet sensor, corona discharge of the equipment is subjected to fixed point, orientation, long distance (2m-50m) and real-time tracking detection in an ultraviolet band, the operating wavelength is less than 280nm, the ultraviolet sensor operates in a current analog quantity acquisition mode, and a section of spectrum avoids an ultraviolet band of sunlight and is a solar blind area of the sunlight.
3. The device for ultraviolet online remote real-time monitoring of abnormal discharge of electric transmission and transformation equipment as claimed in claim 1, wherein the ultraviolet detector of the ultraviolet sensor adopts an analog quantity acquisition scheme.
4. The ultraviolet online remote real-time monitoring device for abnormal discharge of the electric transmission and transformation equipment as claimed in claim 1, wherein the AD circuit comprises an AD conversion and signal processing circuit, which generates a digital signal according to a certain sampling frequency by performing digital integration operation on a photocurrent signal of the ultraviolet sensor; the AD circuit sampling frequency and threshold value are judged, and the AD circuit is selected through a large number of tests according to user specifications and relates to the effectiveness of sending background data; all data meeting the threshold are transmitted to the background system through the wireless module; and the AD processing unit considers that the data sent by the sensor is interference or noise, discards the data and does not send the data to the wireless transmission module any more when the data is greater than or less than the threshold value.
5. The ultraviolet online remote real-time monitoring device for abnormal discharge of electric transmission and transformation equipment according to claim 1, wherein the wireless transmission module is configured with a plurality of low-power transmission protocols including LORA, 433M, BLE, Nb _ ioT and Zigbee to realize real-time online transmission of data; the wireless transmission module adopts a low-power consumption wireless module, transmits data to a wireless base station with a distance of not more than 500 meters, and uploads the data to a background system through a wireless private network; the working voltage of the wireless transmission module is 3V, the working current is 12mA, and the sleep mode current is 0.1 mA.
6. The ultraviolet online remote real-time monitoring device for abnormal discharge of electric transmission and transformation equipment as claimed in claim 1, wherein the MCU unit selects 1Hz/s as the sampling frequency.
7. The ultraviolet online remote real-time monitoring device for abnormal discharge of electric transmission and transformation equipment as claimed in claim 1, wherein the MCU controls the operation and sleep duration of all the modules, and sets the sleep parameters according to the ratio of 0.01S of operation in 1S period.
8. The ultraviolet online remote real-time monitoring device for abnormal discharge of electric transmission and transformation equipment as claimed in claim 1, wherein the MCU power management system controls the switching of the power supply system between photovoltaic power supply, lithium battery power supply, and lithium battery charging modes.
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| CN112462172A (en) * | 2020-11-11 | 2021-03-09 | 国网四川省电力公司电力科学研究院 | Electric energy quality event wave recording method adaptive to sampling rate |
| CN112462172B (en) * | 2020-11-11 | 2023-06-13 | 国网四川省电力公司电力科学研究院 | Power quality event wave recording method with self-adaptive sampling rate |
| CN115856556A (en) * | 2023-03-02 | 2023-03-28 | 深圳市帝稳电子有限公司 | Product detection method and system for power adapter production |
| CN116699335A (en) * | 2023-06-16 | 2023-09-05 | 广州友智电气技术有限公司 | Partial discharge monitoring method and system for high-voltage power equipment |
| CN116699335B (en) * | 2023-06-16 | 2024-03-08 | 广州友智电气技术有限公司 | Partial discharge monitoring method and system for high-voltage power equipment |
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Application publication date: 20200410 |