GIS partial discharge detection method and system based on multi-sensor combination

Abstract

The invention provides a GIS partial discharge detection method and system based on multi-sensor combination, and the method comprises the steps: dividing a GIS chamber into an A-type chamber and a B-type chamber according to whether the interior of the chamber is provided with a circuit breaker and an isolation switch; a reasonable typical defect model is arranged to simulate various possible defects in the GIS equipment, wherein the defects comprise a metal tip defect, a metal suspension defect, a metal attachment defect and a basin-type insulator bubble defect; an ultrahigh-frequency sensor, an ultrasonic sensor and a fluorescent optical fiber sensor are used in a combined manner, and corresponding different configuration modes are adopted for different sensors based on the characteristics of various sensors according to the types of cavities A and B and possible defects, so that the partial discharge signals of the GIS equipment are acquired; a high-cooperation and high-quality GIS equipment partial discharge signal set is obtained, and a comprehensive data source is provided for subsequent defect type determination and defect position positioning.

Description

Technical Field

[0001] The present invention belongs to the technical field of high voltage and insulation, and in particular relates to a GIS partial discharge detection method and system based on multi-sensor combination. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the power industry's pursuit of energy conservation and environmental protection, efficient and reliable GIS equipment plays a vital role in the stability and security of the power grid. However, the complex internal structure of GIS makes it susceptible to environmental, temperature, and pressure factors during production and operation. This can lead to various defects, such as suspended metal particles, internal defects in pot insulators, and sealing issues. These issues not only disrupt normal equipment operation but can also cause serious safety incidents. Therefore, implementing real-time and effective monitoring of GIS equipment to promptly detect and address these defects is a key measure to ensure the safety and stability of the power grid.

[0004] Currently, most partial discharge (PD) detection technologies rely primarily on a single detection metric, which, to a certain extent, limits the comprehensiveness and accuracy of fault diagnosis. While these technologies perform well in specific applications, their comprehensive diagnostic capabilities for complex power system equipment, such as gas-insulated switchgear (GIS), need to be improved. In this context, multi-parameter joint detection and diagnosis technologies are particularly important, but the technology in this area is still immature and requires further development and improvement. Compared with methods that rely on a single detection metric, multi-parameter joint detection and diagnosis technologies can provide a more comprehensive and in-depth understanding of insulation defects in GIS equipment by integrating information collected by multiple sensors. This approach not only increases the detection dimensionality but also improves the sensitivity and accuracy of fault detection. By accurately analyzing and integrating the collected data, the type and specific location of defects within GIS equipment can be identified earlier and more accurately.

[0005] Multi-parameter joint diagnostic technology is crucial for preventing equipment failures, guiding equipment maintenance, and ensuring stable power grid operation. By performing comprehensive multi-parameter testing and diagnostics on GIS equipment, operations and maintenance teams can not only promptly detect and locate insulation defects but also assess their potential impact on equipment performance and grid security. This allows necessary repairs or replacements to be implemented before problems escalate, ensuring continuous and reliable power supply. Therefore, designing and developing a multi-sensor-based partial discharge detection technology not only has significant theoretical research value but also holds practical significance and broad application prospects for improving the reliability of GIS equipment and ensuring stable power system operation. Summary of the Invention

[0006] To address these issues, this paper proposes a multi-sensor GIS partial discharge detection technology. This technology specifically captures diverse partial discharge signals when partial discharge occurs within GIS equipment, effectively providing a rich data resource for analyzing and diagnosing the causes of partial discharge within the GIS. This not only lays a solid data foundation for routine equipment maintenance and timely repairs, but also further enhances the relevance and effectiveness of preventive measures and treatment strategies.

[0007] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0008] In a first aspect, a multi-sensor combined GIS partial discharge detection method is disclosed, comprising:

[0009] GIS chambers are divided into two categories: one is the chamber containing circuit breakers and disconnectors, called Class A chambers; the other is the chamber without circuit breakers and disconnectors, called Class B chambers;

[0010] Typical defect models are set up to simulate various types of defects that may occur inside GIS equipment, including metal tip defects, metal suspension defects, metal adhesion defects, and basin insulator bubble defects.

[0011] To simulate partial discharge in GIS equipment and detect the signals generated by partial discharge due to internal defects in GIS equipment, different sensor settings are used for Class A and Class B chambers to collect partial discharge signals of GIS equipment, providing a data source for subsequent determination of defect types and positioning of defects.

[0012] As a further technical solution, targeting the metal tip defect, a metal tip model is developed and fixed to the metal shell side or metal conductor side of the GIS equipment.

[0013] As a further technical solution, to address the metal suspension defects, "spherical" metal particles are formulated and suspended on the metal shell side, metal conductor side or basin insulator surface using insulating tape.

[0014] As a further technical solution, to address metal adhesion defects, "spherical" metal particles are formulated and directly adhered to the metal shell side, metal conductor side or pot insulator surface.

[0015] As a further technical solution, experiments were conducted using pot-type insulators with internal bubbles to address the bubble defects of pot-type insulators.

[0016] As a further technical solution, different methods are used to detect GIS partial discharge signals, including the use of ultra-high frequency detection. When partial discharge occurs in GIS equipment, a corresponding ultra-high frequency electromagnetic wave signal is generated;

[0017] During the signal acquisition process, a built-in ultra-high frequency sensor is used for signal acquisition; and an external ultra-high frequency sensor is used for signal acquisition.

[0018] As a further technical solution, when using the UHF method for detection, the sensor position is set as follows: for built-in UHF sensors, they are placed on the outer shell side of each chamber, and their specific position is determined according to the chamber type; for external UHF sensors, they are placed on the basin insulator of each chamber.

[0019] As a further technical solution, when using the UHF method for detection, when setting up the built-in UHF sensor, for Class A chambers, corresponding built-in sensors are set at the three equal points of the chamber, that is, at 1 / 3 and 2 / 3 of the chamber length, and the two are located at the same height in the vertical direction;

[0020] For Class B chambers, a corresponding built-in sensor is set at the bisection point of the chamber, i.e., half of the chamber length;

[0021] When setting up an external UHF sensor, place it on the flange of the pot-type insulator. More often, an external UHF sensor is set at the flange of each pot-type insulator in the GIS equipment. After the UHF sensor is installed, connect it to the oscilloscope and collect relevant signals after power is turned on.

[0022] As a further technical solution, the partial discharge signals of GIS equipment are collected when using ultrasonic inspection;

[0023] When partial discharge occurs in GIS equipment, corresponding ultrasonic signals are generated. During the signal acquisition process, external contact sensors can be used to collect signals on the outside of the shell, and internal fiber optic ultrasonic sensors can be used to collect signals inside the GIS. Both sensors need to be connected to the GIS equipment through a coupling agent.

[0024] As a further technical solution, when using ultrasonic detection, an external contact ultrasonic sensor is selected to collect the ultrasonic signal generated when partial discharge occurs in the equipment;

[0025] For Class A chambers, corresponding external contact ultrasonic sensors are installed at the two fifth-division points closest to the basin insulator and the bisection point of the chamber, that is, at 1 / 5, 1 / 2, and 4 / 5 of the chamber length, and the three are located at the same height in the direction of gravity;

[0026] For Class B chambers, corresponding external contact ultrasonic sensors are set at the three points that divide the chamber into three equal parts, that is, at 1 / 3 and 2 / 3 of the chamber length, and the two are located at the same height in the direction of gravity;

[0027] After the ultrasonic sensor is installed, it is connected to the GIS equipment through a coupling agent, and the signal is transmitted to the oscilloscope, and the relevant signal is collected after power is turned on.

[0028] As a further technical solution, when using optical detection, the partial discharge signal of the GIS equipment is collected;

[0029] When partial discharge occurs in GIS equipment, it generates a corresponding optical signal. During the signal acquisition process, a built-in fluorescent fiber optic sensor is used to collect the relevant signals. Regarding sensor placement, the fluorescent fiber optic sensor is coupled with a built-in ultra-high frequency sensor.

[0030] In a second aspect, a GIS partial discharge detection device based on multi-sensor combination is disclosed, comprising:

[0031] Partial discharge module, detection device and signal acquisition unit;

[0032] The partial discharge module is used to simulate partial discharge in GIS equipment. The simulated partial discharge defect types include: metal tip defect, metal suspension defect, metal adhesion defect and basin insulator bubble defect;

[0033] The signal acquisition unit is provided in the GIS chamber according to various sensors corresponding to the detection device;

[0034] The detection device collects the partial discharge signal of the GIS equipment under each defect type through the signal acquisition unit and determines the position.

[0035] As a further technical solution, GIS equipment is divided into different chambers based on the type of equipment in the chamber and the type of defects that may occur. The GIS chambers are divided into two categories: one is the chamber containing circuit breakers and disconnectors, called Class A chambers; the other is the chamber that does not contain circuit breakers and disconnectors, called Class B chambers.

[0036] One or more of the above technical solutions have the following beneficial effects:

[0037] The multi-sensor combined GIS partial discharge detection method disclosed in this embodiment can obtain multiple partial discharge signals in a more targeted manner when partial discharge occurs inside the GIS equipment, providing a data source for exploring the cause of partial discharge inside the GIS equipment and providing reliable data support for subsequent maintenance and repair of the equipment.

[0038] On the one hand, the technical solution disclosed in this embodiment takes into account the detection effects of various sensors on different defects when placing the sensors, and also takes into account the equipment conditions of different GIS chambers, thereby achieving coordination between the various sensors, improving the utilization rate of the corresponding sensor performance, and reducing unnecessary sensor usage; on the other hand, the collection process of the partial discharge signal of the GIS equipment can be operated under power throughout the entire process, without the need to adjust the relevant sensors. Under the premise of ensuring operational safety, the efficiency of signal collection is improved, and a relatively fast and accurate data source is provided for the subsequent fault location, identification and diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0040] Figure 1 Schematic diagram of placement of a UHF sensor in a Class A chamber of a GIS device in an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of placement of a UHF sensor in a Class B chamber of a GIS device in an embodiment of the present invention;

[0042] Figure 3 Schematic diagram of the placement of ultrasonic sensors in a Class A chamber of a GIS device according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the placement of ultrasonic sensors in a Class B chamber of a GIS device in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are for describing particular embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0046] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0047] Example 1

[0048] This embodiment discloses a GIS partial discharge detection method based on multi-sensor combination, including:

[0049] GIS chambers are divided into two categories: one is the chamber containing circuit breakers and disconnectors, called Class A chambers; the other is the chamber without circuit breakers and disconnectors, called Class B chambers;

[0050] By setting up reasonable typical defect models, various defects that may occur inside GIS equipment are simulated, including metal tip defects, metal suspension defects, metal adhesion defects, and basin insulator bubble defects;

[0051] When detecting signals generated by partial discharge due to internal defects in GIS equipment, ultra-high frequency sensors, ultrasonic sensors, and fluorescent fiber optic sensors are used in combination, with different sensor configurations adopted, to collect partial discharge signals from GIS equipment, providing a data source for subsequent determination of defect types and location of defects.

[0052] When using different methods to detect GIS partial discharge signals, including the use of ultra-high frequency detection, when partial discharge occurs in GIS equipment, a corresponding ultra-high frequency electromagnetic wave signal will be generated;

[0053] During the signal acquisition process, a built-in ultra-high frequency sensor is used for signal acquisition; and an external ultra-high frequency sensor is used for signal acquisition.

[0054] When using the UHF method for detection, the sensor position setting method is: for built-in UHF sensors, they are placed on the outer shell side of each chamber, and their specific position is determined according to the chamber type; for external UHF sensors, they are placed on the basin insulator of each chamber.

[0055] When using the UHF method for detection, when setting up the built-in UHF sensor, for Class A chambers, corresponding built-in sensors are set at the three equal points of the chamber, that is, at 1 / 3 and 2 / 3 of the chamber length, and the two are located at the same height in the vertical direction, such as Figure 1 shown.

[0056] For Class B chambers, a corresponding built-in sensor is set at the bisection point of the chamber, that is, at 1 / 2 of the chamber length, such as Figure 2 shown.

[0057] When setting up an external UHF sensor, place it on the flange of the pot-type insulator. More often, an external UHF sensor is set at the flange of each pot-type insulator in the GIS equipment. After the UHF sensor is installed, connect it to the oscilloscope and collect relevant signals after power is turned on.

[0058] When using ultrasonic testing, collect partial discharge signals of GIS equipment;

[0059] When partial discharge occurs in GIS equipment, corresponding ultrasonic signals are generated. During the signal acquisition process, external contact sensors can be used to collect signals on the outside of the shell, and internal fiber optic ultrasonic sensors can be used to collect signals inside the GIS. Both sensors need to be connected to the GIS equipment through a coupling agent.

[0060] When using the ultrasonic method for detection, an external contact ultrasonic sensor is used to collect the ultrasonic signal generated when partial discharge occurs in the equipment;

[0061] For Class A chambers, corresponding external contact ultrasonic sensors are set at the two fifth-division points closest to the basin insulator and the bisection point of the chamber, that is, at 1 / 5, 1 / 2, and 4 / 5 of the chamber length, and the three are located at the same height in the direction of gravity, such as Figure 3 shown.

[0062] For Class B chambers, corresponding external contact ultrasonic sensors are set at the three points of the chamber, that is, at 1 / 3 and 2 / 3 of the chamber length, and the two are at the same height in the direction of gravity, such as Figure 4 shown.

[0063] After the ultrasonic sensor is installed, it is connected to the GIS equipment through a coupling agent, and the signal is transmitted to the oscilloscope, and the relevant signal is collected after power is turned on.

[0064] When using optical detection, collect partial discharge signals of GIS equipment;

[0065] When partial discharge occurs in GIS equipment, it generates a corresponding optical signal. During the signal acquisition process, a built-in fluorescent fiber optic sensor is used to collect the relevant signals. Regarding sensor placement, the fluorescent fiber optic sensor is coupled with a built-in ultra-high frequency sensor.

[0066] Example 2

[0067] This embodiment provides a detailed description of the specific placement of sensors in chambers A and B.

[0068] This embodiment proposes a multi-sensor combined GIS partial discharge detection system, which includes different GIS chambers, partial discharge modules, ultra-high frequency detection devices, ultrasonic detection devices, optical detection devices, and placement methods of various sensors.

[0069] Different GIS chambers are categorized based on the type of equipment within them and the types of defects that may occur. This embodiment primarily divides GIS chambers into two types: Class A chambers containing circuit breakers and disconnectors; and Class B chambers without circuit breakers and disconnectors. The operation of circuit breakers and disconnectors during operation produces a series of byproducts, such as metal wire and metal debris. These byproducts may remain suspended in the sulfur hexafluoride gas near the surface of the equipment or adhere to the surface, causing internal defects in the GIS equipment. Larger byproducts or their accumulation to a certain extent can cause partial discharge (PD). Therefore, Class A chambers are more susceptible to PD due to these defects, necessitating the installation of a relatively large number of sensors to collect the relevant signals.

[0070] The GIS chambers are divided into two categories based on the different characteristics of the chambers, that is, the different types and probabilities of possible defects, and the appropriate sensor configuration is selected. This achieves coordination between the various sensors, improves the utilization rate of the corresponding sensor performance, and reduces unnecessary sensor use.

[0071] The partial discharge module is a module used to simulate partial discharge in GIS equipment. During the installation of GIS equipment, bolts, screws and other devices are required for fixing; during the operation of GIS equipment, circuit breakers and disconnectors will operate according to corresponding instructions; based on the above situation, metal debris will inevitably be generated, and then metal suspension defects, metal adhesion defects or metal tip defects will be formed inside the GIS equipment. During the casting process of the pot insulator, if the manufacturing process is not well controlled, bubbles may appear inside the pot insulator. Larger bubbles will be detected during factory inspection. Although smaller bubbles will pass the inspection, they will eventually cause partial discharge under long-term working conditions. Therefore, the defect types mainly considered in this embodiment are metal tip defects, metal suspension defects, metal adhesion defects and pot insulator bubble defects.

[0072] To address metal tip defects, a customized metal tip model is fixed to the metal casing or metal conductor side of the GIS equipment. The model has a "quasi-conical" shape, a height of 3mm, and a bottom radius of 1mm. The top part of the model is polished accordingly. When fixing it, it can be fixed to the surface of the internal material of the GIS equipment using insulating glue.

[0073] To address metal suspension defects, custom metal particles are suspended on the side of metal casings, metal conductors, or the surface of basin insulators using insulating tape. The particles are shaped like "spheres" with a radius of 1mm. In practice, the metal particles are placed on the insulating tape, isolating them from the equipment and achieving a suspension effect.

[0074] In this embodiment, the metal particles used for the metal suspension defects and the metal adhesion defects may be of the same type, but are placed in different ways.

[0075] To address metal adhesion defects, custom metal particles are directly adhered to the metal casing, metal conductor, or the surface of a pot insulator using insulating adhesive. These particles are shaped like "spheres" with a radius of 1 mm. To address bubble defects in pot insulators, experiments are conducted using pot insulators with internal bubbles, collecting various parameter signals when partial discharge occurs there. Each parameter signal corresponds to the type of sensor used. For example, ultra-high frequency signals require ultra-high frequency sensors and their associated equipment, while ultrasonic signals require ultrasonic sensors and their associated equipment.

[0076] During specific inspections, the corresponding defect type and location are first set inside the GIS. Then, UHF sensors, ultrasonic sensors, and optical sensors are set according to the type of chamber, and the equipment is packaged, inflated, and pressurized. Finally, when partial discharge occurs in the GIS equipment, the above sensors are used to collect the corresponding signals to obtain a high-quality and well-matched partial discharge signal data set.

[0077] In addition, based on the characteristics of the equipment inside chambers A and B, three types of sensor positions are set up to achieve all-round and multi-angle detection of partial discharge in the equipment, thereby providing a data source for subsequent determination of defect types and positioning of defect locations.

[0078] If a UHF detection device is used to collect partial discharge signals from GIS equipment, when partial discharge occurs in GIS equipment, a corresponding UHF electromagnetic wave signal will be generated. Both built-in UHF sensors and external UHF sensors can be used for signal collection. The survey found that the UHF detection method is very sensitive to partial discharge signals caused by various defects. When setting up a built-in UHF sensor, for Class A chambers, such as Figure 1 As shown in the figure, corresponding built-in sensors are set at the three points of the chamber (i.e., 1 / 3 and 2 / 3 of the chamber length), and the two are located at the same height in the vertical direction; for Class B chambers, as shown in the figure, Figure 2 As shown, a corresponding internal sensor is installed at the bisection point of the chamber (i.e., halfway along the chamber length). When installing an external UHF sensor, place it on the flange of the basin insulator. Typically, an external UHF sensor is installed at the flange of each basin insulator in the GIS. After the UHF sensor is installed, connect it to an oscilloscope and collect relevant signals after power is applied.

[0079] In the above-mentioned UHF detection method, the detection effects of various sensors on different defects are taken into consideration, the equipment conditions of different GIS chambers are taken into consideration, the coordination between various sensors is achieved, the utilization rate of the corresponding sensor performance is improved, and unnecessary sensor use is reduced.

[0080] Use ultrasonic detection equipment to collect local discharge signals of GIS equipment. When local discharge occurs in GIS equipment, corresponding ultrasonic signals will be generated. External contact sensors can be used to collect signals on the outside of the shell, and built-in fiber optic ultrasonic sensors can be used to collect signals inside the GIS. The survey found that the ultrasonic detection method is good in collecting and identifying tip defects and suspended discharge defects, but it is not sensitive enough to defects such as surface and air gap discharge of insulating parts. In addition, the detection range of ultrasonic sensors is small, and the effect is not good if the distance is too far. For the convenience of installation and collection, this embodiment uses external contact ultrasonic sensors to collect ultrasonic signals generated when local discharge occurs in the equipment. For Class A chambers, such as Figure 3 As shown in the figure, corresponding external contact ultrasonic sensors are set at the two fifth-division points closest to the pot insulator and the bisection point of the chamber, that is, at 1 / 5, 1 / 2, and 4 / 5 of the chamber length, and the three are located at the same height in the direction of gravity; for Class B chambers, as shown in the figure, Figure 4 As shown in the figure, corresponding external contact ultrasonic sensors are installed at two points dividing the chamber into three equal parts: one-third and two-thirds of the chamber length, with both located at the same height in the direction of gravity. After the ultrasonic sensors are installed, they are connected to the GIS equipment via a coupling agent, and the signal is transmitted to an oscilloscope. After power is applied, the relevant signal is collected.

[0081] When using the ultrasonic method for detection, the equipment conditions of different GIS chambers and the types and probabilities of possible defects are taken into consideration. On the one hand, such a setting reflects the type and probability of defects. The situation of Class A is more complicated than that of Class B, so more settings are required. On the other hand, such a setting can achieve coordination between multiple sensors and obtain higher quality signals, providing a high-quality data source for subsequent determination of defect types and positioning of defect locations.

[0082] Use optical detection device to collect partial discharge signals of GIS equipment. When partial discharge occurs in GIS equipment, it will generate corresponding optical signals, and the built-in fluorescent fiber optic sensor is used to collect relevant signals. In terms of sensor location setting, in order to achieve coupling between sensors and reduce the number of measurement points, this embodiment couples the fluorescent fiber optic sensor with the built-in UHF sensor and places it in the same place. Figure 1 and Figure 2The built-in ultra-high frequency sensor is located in the same position. After the fluorescent fiber optic sensor is installed, the signal is transmitted to the acquisition device via the signal transmission line, thereby obtaining the optical signal generated by the partial discharge of the equipment.

[0083] In the technical solution of this embodiment, multiple sensors are set up to collect all-round and multi-parameter signals generated by GIS equipment when local discharge occurs due to defects, providing a data source for subsequent defect type identification and location positioning.

[0084] The above embodiment devices and methods are associated with each other and are used to implement the specific method in embodiment 1. For the specific implementation method, please refer to the relevant description part of embodiment 1.

[0085] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A GIS partial discharge detection method based on multi-sensor combination, characterized by: include: Based on the types of equipment inside the chamber and the types of defects that may occur, GIS chambers are divided into two categories: chambers containing circuit breakers and disconnectors are classified as Class A chambers; chambers without circuit breakers and disconnectors are classified as Class B chambers; By setting up reasonable typical defect models, various defects that may occur inside GIS equipment are simulated, including metal tip defects, metal suspension defects, metal adhesion defects, and basin insulator bubble defects; By combining ultra-high frequency sensors, ultrasonic sensors, and fluorescent fiber optic sensors, and targeting chamber types A and B, and based on the characteristics of each sensor, different configurations are adopted for different sensors to collect partial discharge signals from GIS equipment. This allows for a highly coordinated, high-quality set of partial discharge signals from GIS equipment to be acquired, providing a data source for subsequent defect type determination and defect location positioning.

2. A GIS partial discharge detection method based on multi-sensor combination as claimed in claim 1, characterized in that: For metal tip defects, a metal tip model is developed and fixed to the metal shell side or metal conductor side of the GIS equipment; To address metal suspension defects, "spherical" metal particles are formulated and suspended on the metal casing, metal conductor, or basin insulator surface using insulating tape; To address metal adhesion defects, "spherical" metal particles are formulated and directly adhered to the metal shell side, metal conductor side or pot insulator surface; Aiming at the bubble defects of pot-type insulators, experiments were carried out using pot-type insulators with internal bubbles.

3. The GIS partial discharge detection method based on multi-sensor combination as claimed in claim 1 is characterized in that: When using the UHF method for detection, the sensor position setting method is: for built-in UHF sensors, they are placed on the outer shell side of each chamber, and their specific position is determined according to the chamber type; for external UHF sensors, they are placed on the basin insulator of each chamber.

4. A GIS partial discharge detection method based on multi-sensor combination as claimed in claim 3, characterized in that: When using the UHF method for detection, when setting up the built-in UHF sensor, for Class A chambers, corresponding built-in sensors are set at the three equal points of the chamber, that is, 1 / 3 and 2 / 3 of the chamber length, and the two are located at the same height in the vertical direction.

5. The GIS partial discharge detection method based on multi-sensor combination as claimed in claim 3 is characterized in that: For Class B chambers, a corresponding built-in sensor is set at the bisection point of the chamber, i.e., half of the chamber length; When setting up an external UHF sensor, place it on the flange of the pot-type insulator. More often, an external UHF sensor is set at the flange of each pot-type insulator in the GIS equipment. After the UHF sensor is installed, connect it to the oscilloscope and collect relevant signals after power is turned on.

6. The GIS partial discharge detection method based on multi-sensor combination as claimed in claim 1 is characterized in that: When using ultrasonic testing, collect partial discharge signals of GIS equipment; When partial discharge occurs in GIS equipment, corresponding ultrasonic signals are generated. During the signal acquisition process, external contact sensors can be used to collect signals on the outside of the shell, and internal fiber optic ultrasonic sensors can be used to collect signals inside the GIS. Both sensors need to be connected to the GIS equipment through a coupling agent.

7. The GIS partial discharge detection method based on multi-sensor combination as claimed in claim 6 is characterized in that: When using the ultrasonic method for detection, an external contact ultrasonic sensor is used to collect the ultrasonic signal generated when partial discharge occurs in the equipment; For Class A chambers, corresponding external contact ultrasonic sensors are installed at the two fifth-division points closest to the basin insulator and the second-division point of the chamber, that is, at 1 / 5, 1 / 2, and 4 / 5 of the chamber length, and the three are located at the same height in the direction of gravity.

8. The GIS partial discharge detection method based on multi-sensor combination as claimed in claim 6 is characterized in that: For Class B chambers, corresponding external contact ultrasonic sensors are set at the three equal points of the chamber, i.e., 1 / 3 and 2 / 3 of the chamber length, and the two are located at the same height in the direction of gravity; After the ultrasonic sensor is installed, it is connected to the GIS equipment through a coupling agent, and the signal is transmitted to the oscilloscope, and the relevant signal is collected after power is turned on.

9. The GIS partial discharge detection method based on multi-sensor combination as claimed in claim 1 is characterized in that: When using optical detection, collect partial discharge signals of GIS equipment; When partial discharge occurs in GIS equipment, a corresponding optical signal will be generated. During the signal acquisition process, a built-in fluorescent fiber optic sensor is used to collect relevant signals. In terms of sensor position setting, the fluorescent fiber optic sensor is coupled with the built-in ultra-high frequency sensor and placed.

10. A GIS partial discharge detection device based on multi-sensor combination, characterized by: include: Partial discharge module, detection device and signal acquisition unit; The partial discharge module is used to simulate partial discharge in GIS equipment. The simulated partial discharge defect types include: metal tip defect, metal suspension defect, metal adhesion defect and basin insulator bubble defect; The signal acquisition unit is provided in the GIS chamber according to various sensors corresponding to the detection device; The detection device collects the partial discharge signal of the GIS equipment under each defect type through the signal acquisition unit and determines the position.

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