A partial discharge on-line monitoring system and method for gas insulated switchgear

Abstract

The application provides a partial discharge on-line monitoring system and method for a gas insulated switch, and belongs to the technical field of electrical monitoring. The system comprises a collection system, an analysis system and a server. The collection system comprises a collection probe and a data collection module. The output end of the collection probe is electrically connected with the input end of the data collection module. The analysis system comprises a fault analysis module, a fault positioning module, a fault early warning module and a communication module. The fault early warning module is electrically connected with the fault analysis module and the fault positioning module. The fault early warning module is electrically connected with the communication module. The communication module is used for sending a warning report to the server. The server comprises an upper computer and a fault database. The method collects the working state of the sensor through multiple forms, thereby eliminating monitoring interference, accurately judging the partial discharge fault, accurately positioning the fault position, establishing a fault database and continuously optimizing the judgment of the monitoring system.

Description

Technical Field

[0001] This invention belongs to the field of electrical monitoring technology, and more specifically, relates to an online monitoring system and method for partial discharge of gas-insulated switches. Background Technology

[0002] With continuous economic development and the expansion of power grids, the number of gas-insulated switchgear (GIS) is also increasing. GIS is a type of high-voltage power distribution equipment, offering advantages such as reliability, safety, and long maintenance cycles, ensuring the reliable operation of power grid distribution systems. However, various defects can occur due to installation and operation, such as metal protrusions and surface contamination. During operation, GIS can experience partial discharge, which causes energy loss and accelerates the aging of insulation materials, eventually leading to insulation failure. Furthermore, GIS generally has a complex structure and high cost. Insulation defects in GIS can seriously threaten the safe operation of the equipment, easily causing power outages. Outage repair procedures are complex, time-consuming, and costly. Therefore, early monitoring of partial discharge is crucial for the inspection and maintenance of GIS equipment.

[0003] Currently, most existing monitoring systems use a single method of ultra-high frequency detection, which is easily affected by interference from surrounding communication equipment or other electromagnetic waves. They cannot effectively and accurately identify partial discharges generated inside GIS and still rely on manual on-site inspections. Since partial discharges are mostly intermittent, the inspection efficiency and effectiveness are not ideal, and it is time-consuming and labor-intensive. In addition, traditional monitoring systems cannot determine the specific location of partial discharges, which limits the analysis and statistics of fault causes and results in a low level of intelligence. Summary of the Invention

[0004] This invention provides an online partial discharge monitoring system and method for gas-insulated switches. By collecting the working status of the GIS through multiple types of sensors, monitoring interference is eliminated, partial discharge faults are accurately identified, fault locations are precisely located, a fault database is established, and the judgment of the monitoring system is continuously optimized.

[0005] In view of the above problems, the technical solution proposed by the present invention is as follows:

[0006] This invention provides an online partial discharge monitoring system for gas-insulated switches, comprising a data acquisition system, an analysis system, and a server.

[0007] The acquisition system comprises an acquisition probe and a data acquisition module, the acquisition probe is used for monitoring signals generated by partial discharge in real time, and the data acquisition module is used for collecting the monitored signals and performing signal processing and conversion, and an output end of the acquisition probe is electrically connected with an input end of the data acquisition module.

[0008] The analysis system comprises a fault analysis module, a fault positioning module, a fault early warning module and a communication module, the fault analysis module and the fault positioning module both receive signals from the data acquisition module, the fault analysis module calculates signal data to determine fault conditions corresponding to the monitoring data, the fault positioning module compares models of signal data to obtain position information of the partial discharge signals, the fault early warning module is electrically connected with the fault analysis module and the fault positioning module, the fault early warning module is used for generating a partial discharge early warning report according to the monitoring and analysis results, and the fault early warning module is electrically connected with the communication module, and the communication module is used for sending the early warning report to the server.

[0009] The server comprises a host computer and a fault database, the host computer is used for displaying monitoring information in real time and generating charts, background management personnel enter fault elimination report contents through the host computer, and the fault database is used for storing operation logs of the monitoring system.

[0010] As a preferred technical scheme of the present application, the acquisition probe comprises a very high frequency sensor, an ultrasonic sensor, an infrared sensor, a gas sensor and a vibration sensor, which are respectively used for collecting very high frequency signals, ultrasonic signals, temperature change signals, gas decomposition product concentrations and mechanical vibration signals during partial discharge of the gas insulated switch, and the acquisition probe is fixedly installed at an insulating basin of the gas insulated switch.

[0011] As a preferred technical scheme of the present application, the data acquisition module is fixedly installed on a support of the gas insulated switch, the data acquisition module comprises a signal amplification unit, a signal detection unit and a signal conversion unit which are electrically connected in sequence, the signal amplification unit is used for transmitting the signals monitored by the acquisition probe to the signal detection unit after amplification processing, the signal detection unit filters and shapes the amplified signals, and the signal conversion unit is used for performing analog-digital conversion on the shaped signals to obtain digital signals corresponding to the signals and generate monitoring data.

[0012] As a preferred technical scheme of the present application, the fault analysis module comprises a statistical unit and a judgment unit, the statistical unit multiplies the maximum amplitude in the monitoring data of each sensor with a historical defect weight to obtain a fault degree value, and the judgment unit comprehensively judges the fault degree values of the sensors to judge the authenticity of the partial discharge fault.

[0013] As a preferred technical solution of the present application, the fault positioning module comprises a modeling unit and a positioning unit, the modeling unit establishes a virtual model according to the amplitude variation of the monitoring data and the position of the collection probe, and the positioning unit determines the discharge position according to the data corresponding to the sensors at different positions at the same time node in the virtual model in combination with the structure of the gas insulated switch.

[0014] As a preferred technical solution of the present application, the upper computer is electrically connected with the fault database, and the upper computer comprises a fault evaluation module, which is used for inputting a fault evaluation report by the management personnel after the partial discharge fault maintenance is removed, recording the fault type, the troubleshooting reason and the maintenance measure, updating the historical defect weight, and uploading to the fault database for storage.

[0015] As a preferred technical solution of the present application, the fault database is electrically connected with the fault analysis module, and the fault analysis module calls the historical defect weight value in the fault database during calculation.

[0016] On the other hand, a partial discharge online monitoring method for a gas insulated switch comprises the following steps:

[0017] S1, signal collection, real-time synchronous acquisition of ultrahigh frequency signals, ultrasonic signals, temperature variation signals, gas decomposition product concentrations and mechanical vibration signals by a collection probe installed on the gas insulated switch, transmission to a data collection module for signal amplification, filtering and shaping, and analog-digital conversion to obtain corresponding monitoring data and transmission to an analysis system;

[0018] S2, fault analysis, multiplication calculation of the historical defect weight in the fault database and the maximum amplitude in the monitoring data of each sensor by a statistical unit to obtain a fault degree value, and judgment of the authenticity of the partial discharge fault by a judgment unit, when the fault exists, jumping to step S3, and when the fault does not exist, jumping to step S1;

[0019] S3, fault positioning, establishment of a virtual model by a modeling unit according to the amplitude variation of the monitoring data and the position of the collection probe, determination of the discharge position by a positioning unit in the virtual model in combination with the structure of the gas insulated switch according to the data corresponding to the sensors at different positions at the same time node, generation of a warning report by a fault warning module according to the fault degree and position information, and uploading of the warning report to a server through a communication module;

[0020] S4, fault troubleshooting, arrangement of personnel by a background management personnel through an upper computer immediately after receiving the fault report to perform troubleshooting work, inputting of a fault evaluation report by a fault evaluation module after the fault is eliminated, updating of the historical defect weight, and storage of the historical defect weight in the fault database.

[0021] The beneficial effects of the present application relative to the prior art are:

[0022] (1) By setting multiple forms of sensors, the failure signals of partial discharge of gas insulated switches are monitored in real time, effectively preventing the problems of data interference and low precision caused by single sensor monitoring, improving the reliability and effectiveness of the online monitoring system, and the system has high intelligence, reducing labor costs;

[0023] (2) The key points prone to failure are more carefully monitored by the calculation method of monitoring data combined with historical weights, and the accuracy of failure analysis and judgment of the monitoring system is higher by resisting the interference of monitoring data through judgment logic, and after judging that a failure has occurred, the failure position is quickly located through modeling comparison, providing a basis for repair work, speeding up the troubleshooting speed and repair progress, and improving the repair efficiency;

[0024] (3) The background management personnel enter the failure evaluation report through the upper computer, accumulate experience for failure repair, and store data through the database, facilitating data retrieval and review.

[0025] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a partial discharge online monitoring system for a gas insulated switch disclosed by the present application;

[0027] Figure 2 is a flowchart of a partial discharge online monitoring method for a gas insulated switch disclosed by the present application;

[0028] Mark 100, acquisition system; 101, acquisition probe; 1011, ultrahigh frequency sensor; 1012, ultrasonic sensor; 1013, infrared sensor; 1014, gas sensor; 1015, vibration sensor; 102, data acquisition module; 200, analysis system; 201, failure analysis module; 2011, statistical unit; 2012, judgment unit; 202, failure positioning module; 2021, modeling unit; 2022, positioning unit; 203, failure warning module; 204, communication module; 300, server; 301, upper computer; 3011, failure evaluation module; 302, failure database. DETAILED DESCRIPTION

[0029] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0032] Embodiment one

[0033] Referring to the drawings shown in the accompanying drawings, Figure 1 The present application provides a technical solution: a partial discharge on-line monitoring system for a gas insulated switch, comprising an acquisition system 100, an analysis system 200 and a server 300.

[0034] The acquisition system 100 comprises an acquisition probe 101 and a data acquisition module 102. The acquisition probe 101 is used for monitoring signals generated by partial discharge in real time. The acquisition probe 101 comprises a UHF sensor 1011, an ultrasonic sensor 1012, an infrared sensor 1013, a gas sensor 1014 and a vibration sensor 1015, which are respectively used for acquiring UHF signals, ultrasonic signals, temperature change signals, gas decomposition product concentration and mechanical vibration signals when partial discharge occurs in a gas insulated switch. The acquisition probe 101 is fixedly installed at an insulating basin of the gas insulated switch. The acquisition probe 101 acquires signals when partial discharge occurs in the GIS through various forms of sensors, reduces the problem that the traditional single UHF sensor 1011 is prone to interference, and provides a basis for fault analysis and judgment. The data acquisition module 102 is used for collecting monitored signals and performing signal processing and conversion. The output end of the acquisition probe 101 is electrically connected to the input end of the data acquisition module 102. The data acquisition module 102 is fixedly installed on a support of the gas insulated switch. The data acquisition module 102 comprises a signal amplification unit, a signal detection unit and a signal conversion unit which are electrically connected in sequence. The signal amplification unit is used for transmitting signals monitored by the acquisition probe 101 to the signal detection unit after amplification processing. The signal detection unit filters and shapes the amplified signals. The signal conversion unit is used for performing analog-to-digital conversion on the shaped signals to obtain digital signals corresponding to the signals, generating monitoring data, and uniformly processing pulse electrical signals of the sensors into digital signals to obtain values matched with the size of the electrical signals.

[0035] The analysis system 200 comprises a fault analysis module 201, a fault positioning module 202, a fault warning module 203 and a communication module 204. The fault analysis module 201 and the fault positioning module 202 both receive signals from the data acquisition module 102. The fault analysis module 201 calculates signal data to determine fault conditions corresponding to the monitoring data. The fault positioning module 202 models and compares signal data to obtain position information of the partial discharge signals. The fault warning module 203 is electrically connected to the fault analysis module 201 and the fault positioning module 202. The fault warning module 203 is used for generating a partial discharge warning report according to monitoring and analysis results. The fault warning module 203 is electrically connected to the communication module 204. The communication module 204 is used for sending the warning report to the server 300. The warning report records fault information, prompting background management personnel to arrange personnel to check and repair in time.

[0036] The fault analysis module 201 includes a statistical unit 2011 and a judgment unit 2012, the statistical unit 2011 extracts the maximum amplitude in each sensor monitoring data and multiplies the historical defect weight to obtain a fault degree value, the judgment unit 2012 comprehensively judges the fault degree value of each sensor to judge the authenticity of the partial discharge fault, the fault warning threshold is pre-stored in the judgment unit 2012, when the calculated fault degree value of each sensor exceeds the threshold, it is judged that the type corresponding to the sensor has a fault, since the partial discharge forms detected by the ultrahigh frequency sensor 1011 and the ultrasonic sensor 1012 are different, and the fault condition of some discharge forms or small discharge amplitude does not produce heating and vibration, but will definitely cause the gas chamber gas in the GIS to decompose to produce HF and SO2, so the judgment logic of the judgment unit 2012 is that as long as the gas concentration detected by the gas sensor 1014 exceeds the threshold, it is judged that the fault occurs, and among the other four types of sensors, if the monitoring data of two types of sensors exceed the threshold, it is judged that the fault occurs, through this logic, external interference can be excluded, and the accuracy of fault analysis can be improved. After judging that the fault occurs, the fault positioning module 202 starts to calculate and position the fault position, reduces the operation pressure of the system, and ensures the stable operation of the monitoring system.

[0037] The fault positioning module 202 includes a modeling unit 2021 and a positioning unit 2022, the modeling unit 2021 establishes a virtual model according to the amplitude change of the monitoring data and the position of the acquisition probe 101, the positioning unit 2022 determines the discharge position in the virtual model according to the data corresponding to the sensors at different positions at the same time node in combination with the structure of the gas insulated switch, since the rate of signal propagation is different, the signal size received by the sensors at different positions is different, the greater the signal amplitude, the closer to the position of the discharge source, so the accurate position of the discharge source is calculated in combination with the installation position of the sensor and the monitored equipment, the management personnel can obtain the reason of the partial discharge fault by comparing the composition of the monitored equipment, saves the time and speed of on-site troubleshooting, and improves the maintenance efficiency.

[0038] The server 300 comprises a host computer 301 and a fault database 302, the host computer 301 is used for displaying monitoring information in real time and generating a chart, and a background management personnel enters a fault elimination report content through the host computer 301, the host computer 301 can be a computer, a mobile phone or a tablet, and the host computer 301 is convenient for the operation of the background management personnel, and the fault database 302 is used for storing a running log of a monitoring system, the host computer 301 and the fault database 302 are electrically connected, and the host computer 301 comprises a fault evaluation module 3011, the fault evaluation module 3011 is used for entering a fault evaluation report by a management personnel after a partial discharge fault is repaired, recording a fault type, an investigation reason and a repair measure, updating a historical defect weight, and uploading to the fault database 302 for storage, when the management personnel enters the evaluation report, a severity level of a current fault is selected according to an accident influence caused by the fault, and the severity level is saved to the fault database 302, then the fault database 302 automatically increases a corresponding amount of historical defect weight according to the level, and the content stored in the fault database 302 can be retrieved and consulted by the host computer 301 after obtaining permission, so that fault statistics and viewing are facilitated.

[0039] In the embodiment of the application, the fault database 302 is electrically connected with the fault analysis module 201, the fault analysis module 201 retrieves the historical defect weight value in the fault database 302 during calculation, and the historical weight value is updated after each fault occurs, so that monitoring and analysis of the next fault are more accurate.

[0040] Embodiment two

[0041] Referring to FIG. 1, Figure 2 The embodiment of the application further provides a partial discharge online monitoring method for a gas insulated switch, which comprises the following steps:

[0042] S1, signal acquisition, through a collection probe 101 installed on the gas insulated switch, real-time synchronous acquisition of ultrahigh frequency signals, ultrasonic wave signals, temperature change signals, gas decomposition product concentrations and mechanical vibration signals is performed, and the signals are transmitted to a data acquisition module 102 for signal amplification, filtering and shaping and analog-digital conversion, so that corresponding monitoring data are obtained and transmitted to an analysis system 200;

[0043] S2, fault analysis, a statistical unit 2011 multiplies the historical defect weight in the fault database 302 with the maximum amplitude in each sensor monitoring data to obtain a fault degree value, and a judgment unit 2012 judges the authenticity of the partial discharge fault according to the fault degree value, when the fault exists, the process jumps to step S3, and when the fault does not exist, the process jumps to step S1;

[0044] S3, fault positioning, the modeling unit 2021 establishes a virtual model of the amplitude change of the monitoring data and the position of the acquisition probe 101, the positioning unit 2022 determines the discharge position in the virtual model according to the data corresponding to the sensors at different positions at the same time node in combination with the structure of the gas insulated switch, the fault warning module 203 generates a warning report according to the fault degree and position information, and uploads the warning report to the server 300 through the communication module 204;

[0045] S4, fault troubleshooting, after the background management personnel receive the fault report through the host computer 301, personnel are arranged to perform troubleshooting work immediately, after the fault is eliminated, the fault evaluation module 3011 is used to input the fault evaluation report, update the historical defect weight, and store it in the fault database 302.

[0046] In the detailed description above, various features are grouped together in single embodiments for the purpose of streamlining the disclosure. This disclosed approach is not to be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected by the attached claims, the present invention is directed to each individual feature alone as well as the sum and the possible combinations of a majority of such features. The following claims are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment.

[0047] Those skilled in the art will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

[0048] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In the alternative, the processor and the storage medium can reside as discrete components in a user terminal.

[0049] For a software implementation, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes can be stored in memory units and executed by processors. The memory unit can be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.

[0050] The foregoing description includes example embodiments of the application. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art will recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be interpreted as "comprising" rather than "consisting of." Also, the use of the term "about" in describing the application is intended to be interpreted in a conventional sense, as "approximately," "substantially," or "essentially." Additionally, the use of any of the terms "including," "includes," "including," "has," "have," "have," "containing," "contains," "containing" or any other variation thereof are intended to be broad and encompass the terms "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising," "comprises," "comprising,"

Claims

1. A partial discharge on-line monitoring system for a gas insulated switch, characterized in that, The system comprises a collection system, an analysis system and a server, The collection system comprises a collection probe and a data collection module, the collection probe comprises a UHF sensor, an ultrasonic sensor, an infrared sensor, a gas sensor and a vibration sensor, which are respectively used to collect UHF signals, ultrasonic signals, temperature change signals, gas decomposition product concentrations and mechanical vibration signals generated by partial discharge of a gas insulated switch, the collection probe is fixedly installed at an insulating pot of the gas insulated switch, and the collection probe is used to monitor signals generated by partial discharge in real time; The data collection module is used to collect the monitored signals and perform signal processing and conversion, an output end of the collection probe is electrically connected to an input end of the data collection module, the data collection module comprises a signal amplification unit, a signal detection unit and a signal conversion unit which are electrically connected in sequence, the signal amplification unit is used to transmit the signals monitored by the collection probe to the signal detection unit after amplification processing, the signal detection unit filters and shapes the amplified signals, and the signal conversion unit is used to perform analog-to-digital conversion on the shaped signals to obtain digital signals corresponding to the signals, generate monitoring data, and uniformly process pulse electrical signals of the sensors into digital signals to obtain values matching the sizes of the electrical signals; The analysis system comprises a fault analysis module, a fault positioning module, a fault warning module and a communication module, the fault analysis module and the fault positioning module both receive signals from the data collection module, the fault analysis module calculates the signal data to determine fault conditions corresponding to the monitoring data, the fault analysis module comprises a statistical unit and a judgment unit, the statistical unit multiplies the maximum amplitude in the monitoring data of each sensor with a historical defect weight to obtain a fault degree value, and the judgment unit comprehensively judges the fault degree values of the sensors to judge the authenticity of the partial discharge fault, the judgment logic of the judgment unit is that, as long as the gas concentration detected by the gas sensor exceeds a threshold value, the fault is determined to occur, and if the monitoring data of two of the other four types of sensors exceed the threshold value, the fault is determined to occur; The fault positioning module compares the signal data to obtain position information of the partial discharge signals, the fault positioning module comprises a modeling unit and a positioning unit, the modeling unit establishes a virtual model according to the amplitude variation of the monitoring data and the position of the collection probe, and the positioning unit determines the discharge position in the virtual model in combination with the structure of the gas insulated switch according to the data corresponding to the sensors at different positions at the same time node; The fault warning module is electrically connected to the fault analysis module and the fault positioning module, the fault warning module is used to generate a partial discharge warning report according to the monitoring analysis result, the fault warning module is electrically connected to the communication module, and the communication module is used to send the warning report to the server. The server comprises a host computer and a fault database, the host computer is used for displaying monitoring information in real time and generating charts, and a background manager enters fault elimination report content through the host computer, and the fault database is used for storing operation logs of the monitoring system.

2. A partial discharge on-line monitoring system for a gas insulated switch according to claim 1, characterized in that, The data acquisition module is fixedly installed on a support of the gas insulated switch.

3. The partial discharge on-line monitoring system for gas insulated switchgear according to claim 1, wherein, The host computer is electrically connected with the fault database, and the host computer comprises a fault evaluation module, the fault evaluation module is used for entering a fault evaluation report by a manager after the partial discharge fault is repaired, recording fault types, troubleshooting reasons and repair measures, updating historical defect weights, and uploading to the fault database for storage.

4. The partial discharge on-line monitoring system for a gas insulated switch according to claim 1, wherein The fault database is electrically connected with the fault analysis module, and the fault analysis module calls historical defect weight values in the fault database during calculation.

5. A partial discharge on-line monitoring method for gas insulated switchgear, applied to the partial discharge on-line monitoring system for gas insulated switchgear in any one of claims 1-4, characterized in that, The method comprises the following steps: S1, signal acquisition, through the acquisition probe installed on the gas insulated switch, real-time synchronous acquisition of ultrahigh frequency signals, ultrasonic signals, temperature change signals, gas decomposition product concentrations and mechanical vibration signals is realized, and the signals are transmitted to the data acquisition module for signal amplification, filtering and shaping and analog-digital conversion, then corresponding monitoring data is obtained and transmitted to the analysis system; S2, fault analysis, the statistical unit multiplies the historical defect weight in the fault database and the maximum amplitude in the sensor monitoring data to obtain a fault degree value, and the judging unit judges the authenticity of the partial discharge fault according to the fault degree value, when the fault exists, jumping to step S3, when the fault does not exist, jumping to step S1; S3, fault positioning, the modeling unit establishes a virtual model according to the amplitude change of the monitoring data and the position of the acquisition probe, the positioning unit determines the discharge position in the virtual model according to the data corresponding to the sensors at different positions at the same time node in combination with the structure of the gas insulated switch, and the fault warning module generates a warning report according to the fault degree and position information, and uploads the warning report to the server through the communication module; S4, fault troubleshooting, after receiving the fault report through the host computer, the background manager immediately arranges personnel to carry out troubleshooting work, after the fault is eliminated, the fault evaluation module is used to enter a fault evaluation report, update the historical defect weight, and store in the fault database.

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