GIS partial discharge laboratory effective simulation and multi-source detection system and method

Abstract

The application discloses a GIS partial discharge laboratory effective simulation and multi-source detection system and method, which utilizes a pressurizing circuit module to increase a test voltage to an initial partial discharge voltage, and simultaneously outputs a pulse current signal and a power frequency cycle signal; collects a pulse current signal, a high-frequency electromagnetic wave signal, an ultrasonic wave signal and a light signal generated by GIS internal partial discharge, judges the occurrence of the GIS internal partial discharge, and obtains a partial discharge quantity and a discharge state of the partial discharge through a pulse current method; meanwhile, time and phase information of the partial discharge is obtained through the power frequency cycle signal; after completing the partial discharge experiment, composition and concentration of the decomposed gas are detected to obtain GIS internal insulation fault information. The application can realize effective simulation of partial discharge of a real GIS in a laboratory without damaging the GIS body.

Description

Technical Field

[0001] This invention relates to the field of insulation condition detection technology for power equipment, specifically to a true-type GIS discharge laboratory effective simulation and multi-source detection system and method for optical, electrical, acoustic, magnetic, and chemical sources. Background Technology

[0002] The construction of ultra-high voltage (UHV) power grids can resolve energy allocation conflicts, power source coordination conflicts, and land resource conflicts caused by power development, and alleviate energy and environmental pressures resulting from national economic development. Equipment is crucial for the smooth development of UHV power grids. Gas Insulated Switchgear (GIS) is an important distribution device in UHV power grids due to its small footprint and superior technical characteristics. However, insulation defects are still unavoidable during the manufacturing, installation, commissioning, and operation of GIS equipment. These defects include metal spikes on high-voltage conductors, metal protrusions on the inner surface of the casing, and particles adhering to the surface of insulators. These insulation defects may cause local electric field distortion within the GIS, thereby inducing discharge accidents.

[0003] Currently, commonly used methods for partial discharge detection in GIS include ultrasonic methods, ultra-high frequency methods, optical detection methods, and characteristic gas detection methods. Ultrasonic methods detect the ultrasonic signals radiated by partial discharge; ultra-high frequency methods detect the high-frequency electromagnetic signals radiated by partial discharge; optical detection methods detect the light signals generated by partial discharge; and characteristic gas detection methods detect trace amounts of characteristic gases produced by the decomposition of insulating gases such as SF6 due to partial discharge. Simultaneously, the intensity of the partial discharge, i.e., the discharge quantity pC, is calibrated using the pulse current method.

[0004] Studying the partial discharge characteristics of GIS using optical, electrical, acoustic, magnetic, and chemical detection methods in the laboratory is fundamental to effectively obtaining the internal discharge characteristics of GIS, especially if effective simulation of partial discharge experiments and multi-source detection of discharge characteristics can be carried out on full-scale GIS (GIS of the same size and structure as the field GIS). However, partial discharge itself is destructive; each experiment renders the same location within the full-scale GIS cavity unsuitable for repeated testing, reducing the area within the full-scale GIS suitable for partial discharge experiments and eventually rendering the entire full-scale GIS unsuitable for further partial discharge research. Furthermore, full-scale GIS is expensive; for example, a 220kV GIS costs over a million yuan, placing a heavy burden on most university laboratories. If partial discharge simulation studies could be repeatedly conducted on full-scale GIS without damaging it, the burden on university laboratories would be significantly reduced.

[0005] In addition, the true GIS is a fully enclosed metal structure, without the antenna sensor in the UHF method, the fiber optic sensor in the optical detection method, or the path for obtaining SF6 gas in the chemical detection method. This makes it impossible to conduct research on multi-source detection methods of light, electricity, sound, magnetism, and chemistry on the true GIS in the laboratory without damaging the structure of the true GIS or disrupting the uniform distribution of the electric field inside the GIS. Summary of the Invention

[0006] The purpose of this invention is to provide a system and method for effective simulation and multi-source detection of partial discharge in GIS in the laboratory. This invention can effectively simulate discharge defects in real GIS without damaging its structure, and effectively detect the optical, electrical, acoustic, magnetic and chemical decomposition components of the simulated discharge defects. It provides a new solution for the effective simulation of discharge defects in real GIS and the effective study of multi-source discharge characteristics in the laboratory.

[0007] To achieve this objective, the present invention provides an effective simulation and multi-source detection system for partial discharge in a GIS laboratory, comprising a pressurization circuit module, a detection impedance, an ultra-high frequency sensor, an ultrasonic sensor, a fluorescent fiber optic sensor, a test defect model, an oscilloscope, a gas sampling device, and a gas chromatograph. The pressurization circuit module supplies power to the test defect model within the GIS test chamber, raising the test voltage to the initial partial discharge voltage Ui. The detection impedance is used to calibrate the discharge quantity using the pulse current method, acquiring the pulse current signal generated by the partial discharge of the test defect model during the pressurization process. The pressurization circuit module also outputs the pulse current signal and a power frequency periodic signal to the oscilloscope. The ultra-high frequency sensor detects the high-frequency electromagnetic wave signal generated by the partial discharge of the test defect model, and outputs the high-frequency electromagnetic wave signal to the oscilloscope via a coaxial signal line. The ultrasonic sensor detects the ultrasonic signal generated by the partial discharge of the test defect model. An ultrasonic sensor outputs the ultrasonic signal to the oscilloscope via a coaxial signal line; a fluorescent fiber optic sensor is used to detect the optical signal generated by partial discharge in the test defect model, and the optical signal is also output to the oscilloscope via a coaxial signal line; the oscilloscope displays the pulse current signal, the high-frequency electromagnetic wave signal, the ultrasonic signal, and the optical signal to determine the occurrence of partial discharge inside the GIS, obtains the discharge amount of the partial discharge using the pulse current method, and determines the partial discharge state by the amplitude of the high-frequency electromagnetic wave signal, the ultrasonic signal, and the optical signal; simultaneously, the time and phase information of the partial discharge can be obtained from the power frequency periodic signal; a gas sampling device is used to collect the gas inside the GIS test chamber after the discharge test, and the gas sampling bag transmits the collected gas after the partial discharge test to the gas chromatograph, which detects and decomposes the composition and concentration of the gas to obtain information on insulation faults inside the GIS.

[0008] A method for effective laboratory simulation and multi-source detection of partial discharge in GIS includes the following steps:

[0009] Step 1: Calibrate the discharge quantity of the pulse current method using the detection impedance.

[0010] Step 2: Use the voltage boosting circuit module to raise the test voltage to the initial partial discharge voltage Ui, and simultaneously output a pulse current signal and a power frequency cycle signal to the oscilloscope;

[0011] Step 3: Use the detection impedance to acquire the pulse current signal generated by partial discharge inside the GIS. If there is a significant pulse current signal on the oscilloscope, the voltage-applying circuit module stops applying voltage; if there is no significant partial discharge signal on the oscilloscope, the voltage-applying circuit module continues to apply voltage until there is a significant pulse current signal on the oscilloscope.

[0012] Step 4: When a clear pulse current signal is present on the oscilloscope, connect the ultra-high frequency sensor to the oscilloscope. The ultra-high frequency sensor detects the high-frequency electromagnetic wave signal generated by the partial discharge of the test defect model and outputs the high-frequency electromagnetic wave signal to the oscilloscope. Connect the ultrasonic sensor to the oscilloscope. The ultrasonic sensor detects the ultrasonic wave signal generated by the partial discharge of the test defect model and outputs the ultrasonic wave signal to the oscilloscope. Connect the fluorescent fiber optic sensor to the oscilloscope via a coaxial signal line. The fluorescent fiber optic sensor detects the optical signal generated by the partial discharge of the test defect model and outputs the optical signal to the oscilloscope. The oscilloscope displays the pulse current signal, the high-frequency electromagnetic wave signal, the ultrasonic wave signal, and the optical signal to determine the occurrence of partial discharge inside the GIS. The discharge amount of the partial discharge is obtained by the pulse current method. The amplitude of the high-frequency electromagnetic wave signal, the ultrasonic wave signal, and the optical signal is used to determine the state of the partial discharge. At the same time, the time and phase information of the partial discharge can be obtained from the power frequency periodic signal.

[0013] Step 5: After the partial discharge test is completed, the gas sampling device collects the gas inside the GIS test chamber after the discharge test. The gas sampling bag transmits the collected gas after the partial discharge test to the gas chromatograph. The gas chromatograph detects the composition and concentration of the decomposed gas to obtain the internal insulation fault information of the GIS.

[0014] The beneficial effects of this invention are as follows: This invention utilizes an effective simulation and multi-source detection system and method for partial discharge in a GIS laboratory. Without damaging the actual GIS in the laboratory, it obtains the time and phase information of partial discharge through power frequency periodic signals. After the partial discharge test, it uses a gas chromatograph to obtain the composition and concentration information of the gas after SF6 decomposition. It obtains experimental data under different experimental parameters, and the obtained data can be used for subsequent analysis. This has guiding significance for GIS service life prediction, insulation system fault diagnosis, etc. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the method flow of the present invention;

[0017] Among them, 1-pressurization circuit module; 2-detection impedance; 3-laboratory model GIS equipment; 4-basin insulator; 5-smooth, edgeless metal guide rod; 6-high voltage electrode; 7-plexiglass flange; 8-ultra-high frequency sensor; 9-fluorescent fiber optic sensor; 10-gas sampling device; 11-ultrasonic sensor; 12-oscilloscope; 13-gas chromatograph; 14-test chamber; 15-metal particles; 16-ground electrode; 17-gas sampling device valve; 18-gas sampling device pressure gauge; 19-hose; 20-gas sampling bag; 21-test defect; 22-pulse current detection module. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] A GIS-based laboratory system for effective simulation and multi-source detection of partial discharge, such as Figure 1 As shown, it includes a pressurization circuit module 1, a detection impedance 2, an ultra-high frequency sensor 8, an ultrasonic sensor 11, a fluorescent fiber optic sensor 9, a test defect model 21, an oscilloscope 12, a gas sampling device 10, and a gas chromatograph 13.

[0020] The pressurization circuit module 1 is used to supply power to the test defect model 21 in the GIS test chamber 14 and raise the test voltage to the initial partial discharge voltage Ui.

[0021] The detection impedance 2 is used to calibrate the discharge quantity of the pulse current method, and the pulse current signal generated by the partial discharge of the test defect model 21 is collected during the test pressure process;

[0022] The pressurization circuit module 1 is also used to output the pulse current signal and the power frequency period signal to the oscilloscope 12;

[0023] The ultra-high frequency sensor 8 is used to detect the high-frequency electromagnetic wave signal generated by the partial discharge of the test defect model 21. The ultra-high frequency sensor 8 outputs the high-frequency electromagnetic wave signal to the oscilloscope 12 through a coaxial signal line.

[0024] The ultrasonic sensor 11 is used to detect the ultrasonic signal generated by the partial discharge of the test defect model 21, and the ultrasonic sensor 11 outputs the ultrasonic signal to the oscilloscope 12 through a coaxial signal line.

[0025] The fluorescent fiber optic sensor 9 is used to detect the optical signal generated by partial discharge of the experimental defect model 21. The fluorescent fiber optic sensor 9 outputs the optical signal to the oscilloscope 12 through a coaxial signal line.

[0026] The oscilloscope 12 is used to display the pulse current signal, the high-frequency electromagnetic wave signal, the ultrasonic signal, and the optical signal to determine the occurrence of partial discharge inside the GIS. The discharge amount of the partial discharge is obtained by the pulse current method, and the partial discharge state is determined by the amplitude of the high-frequency electromagnetic wave signal, the ultrasonic signal, and the optical signal. At the same time, the time and phase information of the partial discharge can be obtained by the power frequency periodic signal.

[0027] The gas sampling device 10 is used to collect the gas inside the GIS test chamber 14 after the discharge test. The gas sampling bag 20 transmits the collected gas after the partial discharge test to the gas chromatograph 13. The gas chromatograph 13 detects the composition and concentration of the decomposed gas to obtain the internal insulation fault information of the GIS.

[0028] The pulse current method, due to its high acquisition sensitivity, can be used as the primary method for determining the occurrence of partial discharge. It can also be used in conjunction with ultra-high frequency method, ultrasonic method and optical method to simultaneously determine the occurrence of partial discharge.

[0029] In the above technical solution, the specific method for obtaining the discharge quantity of partial discharge using the pulse current method is as follows: Before the test, the discharge quantity of the pulse current method is calibrated by the detection impedance 2, for example, 50pC corresponds to 20mV. During the test, the detection impedance 2 will detect the pulse current signal. According to the amplitude M of the pulse current signal on the oscilloscope, the corresponding discharge quantity P can be calculated: P / M=50 / 20. The discharge quantity is used as an indicator to evaluate the severity of partial discharge. The larger the discharge quantity, the more severe the partial discharge, and the risk of breakdown of the test defect.

[0030] In the above technical solution, the pressurizing circuit module 1 includes a coupling capacitor C1, a voltage divider capacitor C2, and a voltage divider capacitor C3. The coupling capacitor C1 and the sensing impedance 2 are used to output a pulse current signal, and the voltage divider capacitors C2 and C3 are used to output a power frequency periodic signal. The high-voltage terminal of the pressurizing circuit module 1 is connected to the high-voltage terminal of the GIS bushing. One end of the coupling capacitor C1 is connected to the high-voltage terminal of the GIS bushing, and the other end of the coupling capacitor C1 is connected to one end of the sensing impedance 2. The other end of the coupling capacitor C1 outputs a pulse current signal to the oscilloscope 12. The other end of the sensing impedance 2 is connected to one end of the voltage divider capacitor C3, and the other end of the voltage divider capacitor C3 is connected to one end of the voltage divider capacitor C2. The other end of the voltage divider capacitor C3 outputs a power frequency periodic signal to the oscilloscope 12, and the other end of the voltage divider capacitor C2 is connected to the high-voltage terminal of the GIS bushing.

[0031] In the above technical solution, the ultra-high frequency sensor 8 is placed in front of the plexiglass flange 7, the ultrasonic sensor 11 is attached to the top of the GIS housing, and the fluorescent fiber optic sensor 9 is placed on the outer surface of the plexiglass flange 7. At the same time, in order to prevent external interference light sources from affecting the test, the fluorescent fiber optic sensor 9 on the plexiglass flange is covered with an opaque cloth to prevent external light from interfering with it.

[0032] The plexiglass flange 7 is modified from a metal flange of the same proportion. Plexiglass has high toughness and good insulation performance, and can withstand the 0.4-0.6MPa SF6 required for the test. In addition, it can serve as an observation window during the test, so that the test personnel can observe the partial discharge inside the test chamber.

[0033] In the above technical solution, the test defect model 21 includes a metal guide rod 5, a high-voltage electrode 6, and a ground electrode 16, used to simulate test defects. One end of the metal guide rod 5 is connected to the high-voltage end of the basin insulator 4, and the other end of the metal guide rod 5 is connected to the high-voltage electrode 6. The ground electrode 16 is connected to the ground wire through a metal flange. The test defect model 21 includes a corona discharge test defect model, an air gap discharge test defect model, a suspended electrode discharge test defect model, a surface discharge test defect model, and a free metal particle discharge test defect model.

[0034] In the above technical solution, the test defect model 21 is placed in a real GIS test chamber, and the high voltage electrode of the test defect model 21 is connected to the high voltage end of the basin insulator 4 by the smooth, edgeless metal guide rod 5. This defect setting avoids damage to the basin insulator 4 during partial discharge testing.

[0035] In the above technical solution, the free metal particle discharge test defect model includes a metal guide rod 5, a high-voltage electrode 6, a ground electrode 16, and metal particles 15. To connect the defect to the high-voltage end, the metal guide rod 5 is bent at a right angle in the middle. One end of the metal guide rod 5 matches the high-voltage outlet of the basin insulator, and the other end of the metal guide rod 5 fixes the high-voltage electrode of the test defect. The test defect model 21 is placed in the full-size GIS test chamber 14. The high-voltage electrode of the test defect model 21 is connected to the high-voltage end of the basin insulator using the metal guide rod 5. The ground electrode of the test defect model 21 is connected to the ground wire via a copper wire through an acrylic flange.

[0036] In the above technical solution, the gas sampling device 10 transmits the gas to the gas sampling bag 20 through the hose 19. The gas sampling bag 20 then transmits the collected gas after the partial discharge test to the gas chromatograph 13. The gas sampling device 10 also includes a valve 17, which is used to slowly open the gas sampling device 10 so that the experimenter can observe the change in the pressure gauge. The gas sampling port of the laboratory-type GIS is matched with the sleeve interface of the SF6 recovery and filling device, which cannot collect SF6 gas in small volumes. The outlet of the modified gas sampling device 10 can be connected to the gas sampling bag 20 through a hose, and a valve is installed at the outlet of the gas sampling device. This valve can control the gas output rate to prevent the gas sampling bag 20 from bursting due to excessive gas output. At the same time, a pressure gauge is installed above the gas sampling device to facilitate the experimenter to monitor the gas pressure inside the test chamber.

[0037] In the above technical solution, the specific method by which the gas chromatograph 13 acquires the internal insulation fault information of the GIS is as follows:

[0038] Gas chromatograph 13 detects the composition and concentration of the decomposed gas. The concentration of the characteristic gases decomposed from SF6 gas after partial discharge is used to determine the intensity of the discharge. The higher the concentration of the characteristic gases, the more intense the discharge. SF6 insulating gas can decompose into characteristic gases such as SO2F2, SOF2, SO2, and H2S after partial discharge. Severe partial discharge will increase the concentration of the decomposed gases.

[0039] In the laboratory, multi-source detection methods including light, electricity, sound, magnetism, and chemistry are used to detect experimental defects, which can effectively detect the partial discharge of true GIS. This provides a new solution for the effective simulation of discharge defects in true GIS and the effective study of discharge characteristics in the laboratory.

[0040] A method for effective laboratory simulation and multi-source detection of partial discharge in GIS (Gas-Insulated GIS) is proposed. This method connects the high-voltage electrode of the experimental defect to the high-voltage end of the basin-type insulator within the test chamber of a full-scale GIS using a smooth, edge-free metal rod. The low-voltage electrode is connected to the ground wire via a copper wire through a modified plexiglass flange. This solves the problem of repetitive discharge simulation under non-destructive conditions on a full-scale GIS. Furthermore, by effectively arranging and improving the sensors for different detection methods—pulse current method, ultrasonic method, ultra-high frequency method, optical detection method, and chemical detection method—multi-source detection methods (optical, electrical, acoustic, magnetic, and chemical) can be used on a full-scale GIS in the laboratory. Figure 2 As shown, it includes the following steps:

[0041] Step 1: Calibrate the discharge quantity of the pulse current method using the detection impedance 2;

[0042] Step 2: Use the voltage boosting circuit module 1 to raise the test voltage to the initial partial discharge voltage Ui, and simultaneously output the pulse current signal and the power frequency cycle signal to the oscilloscope 12;

[0043] Step 3: Use the detection impedance 2 to collect the pulse current signal generated by partial discharge inside the GIS. If there is an obvious pulse current signal on the oscilloscope 12, the voltage application circuit module 1 stops applying voltage; if there is no obvious partial discharge signal on the oscilloscope 12, the voltage application circuit module 1 continues to apply voltage until there is an obvious pulse current signal on the oscilloscope 12.

[0044] Step 4: When a significant pulse current signal is present on the oscilloscope 12, connect the ultra-high frequency sensor 8 to the oscilloscope 12. The ultra-high frequency sensor 8 detects the high-frequency electromagnetic wave signal generated by the partial discharge of the test defect model 21 and outputs the high-frequency electromagnetic wave signal to the oscilloscope 12. Connect the ultrasonic sensor 11 to the oscilloscope 12. The ultrasonic sensor 11 is used to detect the ultrasonic signal generated by the partial discharge of the test defect model 21 and outputs the ultrasonic signal to the oscilloscope 12. Connect the fluorescent fiber optic sensor 9 to the oscilloscope 12 via a coaxial signal line. An oscilloscope 12 is connected, and the fluorescent fiber optic sensor 9 detects the optical signal generated by partial discharge in the experimental defect model 21, and outputs the optical signal to the oscilloscope 12. The oscilloscope 12 displays the pulse current signal, the high-frequency electromagnetic wave signal, the ultrasonic signal, and the optical signal to determine the occurrence of partial discharge inside the GIS. The discharge amount of the partial discharge is obtained by the pulse current method, and the partial discharge state is determined by the amplitude of the high-frequency electromagnetic wave signal, the ultrasonic signal, and the optical signal. At the same time, the time and phase information of the partial discharge can be obtained by the power frequency periodic signal.

[0045] Step 5: After the partial discharge test is completed, the gas sampling device 10 collects the gas inside the GIS test chamber 14 after the discharge test. The gas sampling bag 20 transmits the collected gas after the partial discharge test to the gas chromatograph 13. The gas chromatograph 13 detects the composition and concentration of the decomposed gas to obtain the internal insulation fault information of the GIS.

[0046] The contents not described in detail in this specification are prior art known to those skilled in the art. Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0047] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0048] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0049] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. An effective simulation and multi-source detection method based on GIS partial discharge laboratory effective simulation and multi-source detection system, characterized in that: The system's pressurization circuit module is used to boost the test voltage to the initial partial discharge voltage Ui; the sensing impedance is used to calibrate the discharge quantity of the pulse current method, acquiring the pulse current signal generated by the partial discharge of the test defect model during the pressurization process; the pressurization circuit module is used to output the pulse current signal and the power frequency cycle signal to the oscilloscope; the ultra-high frequency sensor is used to detect the high-frequency electromagnetic wave signal generated by the partial discharge of the test defect model, and the ultra-high frequency sensor outputs the high-frequency electromagnetic wave signal to the oscilloscope through a coaxial signal line; the ultrasonic sensor is used to detect the ultrasonic signal generated by the partial discharge of the test defect model, and the ultrasonic sensor outputs the ultrasonic signal to the oscilloscope through a coaxial signal line; the fluorescent fiber optic sensor is used to detect the partial discharge generated by the test defect model. Optical signals are output from a fluorescent fiber optic sensor to an oscilloscope via a coaxial signal line. The oscilloscope displays pulse current signals, high-frequency electromagnetic wave signals, ultrasonic signals, and optical signals to determine the occurrence of partial discharge within the GIS. The discharge amount of the partial discharge is obtained using the pulse current method, and the amplitude of the high-frequency electromagnetic wave signals, ultrasonic signals, and optical signals is used to determine the state of the partial discharge. Simultaneously, the time and phase information of the partial discharge can be obtained through the power frequency periodic signal. A gas sampling device is used to collect the gas inside the GIS test chamber after the discharge test. The gas sampling bag transmits the collected gas after the partial discharge test to a gas chromatograph, which detects the composition and concentration of the decomposed gas to obtain information on insulation faults inside the GIS. The test defect model includes a free metal particle discharge test defect model, which includes a metal conductor rod, a high-voltage electrode, a ground electrode, and metal particles. The metal conductor rod is bent into a right angle in the middle, and one end of the metal conductor rod can match the high-voltage end outlet of the basin insulator. The other end of the metal conductor rod can fix the high-voltage electrode of the test defect. The test defect model is placed in a full-size GIS test chamber. The high-voltage electrode of the test defect model is connected to the high-voltage end of the basin insulator using the metal conductor rod. The ground electrode of the test defect model is connected to the ground wire through a metal copper wire and an organic glass flange. Effective simulation and multi-source detection methods include the following steps: Step 1: Calibrate the discharge quantity of the pulse current method; Step 2: Increase the test voltage to the initial partial discharge voltage Ui, and simultaneously output the pulse current signal and the power frequency cycle signal to the oscilloscope; Step 3: Collect the pulse current signal generated by partial discharge inside the GIS. If there is a clear pulse current signal on the oscilloscope, the voltage-applying circuit module stops applying voltage; if there is no clear partial discharge signal on the oscilloscope, the voltage-applying circuit module continues to apply voltage until there is a clear pulse current signal on the oscilloscope. Step 4: Once a clear pulse current signal is detected on the oscilloscope, connect the ultra-high frequency (UHF) sensor to the oscilloscope. The UHF sensor detects the high-frequency electromagnetic wave signal generated by the partial discharge and outputs the high-frequency electromagnetic wave signal to the oscilloscope. Connect the ultrasonic sensor to the oscilloscope. The ultrasonic sensor detects the ultrasonic signal generated by the partial discharge and outputs the ultrasonic signal to the oscilloscope. Connect the fluorescent fiber optic sensor to the oscilloscope. The fluorescent fiber optic sensor detects the optical signal generated by the partial discharge and outputs the optical signal to the oscilloscope. The oscilloscope displays the pulse current signal, high-frequency electromagnetic wave signal, ultrasonic signal, and optical signal to determine the occurrence of partial discharge inside the GIS. The discharge amount of the partial discharge is obtained through the pulse current method, and the partial discharge state is determined by the amplitude of the high-frequency electromagnetic wave signal, ultrasonic signal, and optical signal. At the same time, the time and phase information of the partial discharge can be obtained through the power frequency periodic signal. Step 5: After the partial discharge test is completed, the gas sampling device collects the gas inside the GIS test chamber after the discharge test. The gas sampling bag transmits the collected gas after the partial discharge test to the gas chromatograph. The gas chromatograph detects the composition and concentration of the decomposed gas and obtains the internal insulation fault information of the GIS. In step 5, the specific method for obtaining internal insulation fault information of GIS by gas chromatograph is as follows: gas chromatograph detects the composition and concentration of decomposition gas, and judges the state of partial discharge by judging the composition and concentration of characteristic gas after partial discharge of SF6 gas decomposition. In step 5, the gas sampling device transmits gas to the gas sampling bag via a hose. The gas sampling bag then transmits the gas collected after the partial discharge test to the gas chromatograph. The gas sampling device also includes a valve, which slowly opens the gas sampling device.

2. The effective simulation and multi-source detection method based on the GIS partial discharge laboratory effective simulation and multi-source detection system as described in claim 1, characterized in that: The pressurization circuit module includes a coupling capacitor C1, a voltage divider capacitor C2, and a voltage divider capacitor C3. The coupling capacitor C1 and the detection impedance are used to output a pulse current signal, and the voltage divider capacitors C2 and C3 are used to output a power frequency cycle signal.

3. The effective simulation and multi-source detection method based on the GIS partial discharge laboratory effective simulation and multi-source detection system as described in claim 2, characterized in that: The high-voltage terminal of the pressurization circuit module is connected to the high-voltage terminal of the GIS bushing. One end of the coupling capacitor C1 is connected to the high-voltage terminal of the GIS bushing, and the other end of the coupling capacitor C1 is connected to one end of the sensing impedance. The other end of the coupling capacitor C1 outputs a pulse current signal to the oscilloscope. The other end of the sensing impedance is connected to one end of the voltage divider capacitor C3. The other end of the voltage divider capacitor C3 is connected to one end of the voltage divider capacitor C2. The other end of the voltage divider capacitor C3 outputs a power frequency periodic signal to the oscilloscope. The other end of the voltage divider capacitor C2 is connected to the high-voltage terminal of the GIS bushing.

4. The effective simulation and multi-source detection method based on the GIS partial discharge laboratory effective simulation and multi-source detection system as described in claim 1, characterized in that: The ultra-high frequency sensor is placed in front of the plexiglass flange, the ultrasonic sensor is attached to the top of the GIS housing, and the fluorescent fiber optic sensor is placed on the outer surface of the plexiglass flange. The fluorescent fiber optic sensor is covered with an opaque cloth.

5. The effective simulation and multi-source detection method based on the GIS partial discharge laboratory effective simulation and multi-source detection system as described in claim 1, characterized in that: The test defect model includes a metal guide rod, a high-voltage electrode, and a ground electrode, used to simulate test defects. One end of the metal guide rod is connected to the high-voltage end of the basin insulator, and the other end of the metal guide rod is connected to the high-voltage electrode. The ground electrode is connected to the ground wire through a metal flange. The test defect models include corona discharge test defect model, air gap discharge test defect model, suspended electrode discharge test defect model, surface discharge test defect model, and free metal particle discharge test defect model.

6. The effective simulation and multi-source detection method based on the GIS partial discharge laboratory effective simulation and multi-source detection system as described in claim 1, characterized in that: The gas sampling device is used to transmit the gas through a hose to a gas sampling bag, which then transmits the gas collected after the partial discharge test to the gas chromatograph. The gas sampling device also includes a valve for slowly opening the gas sampling device.

7. The effective simulation and multi-source detection method based on the GIS partial discharge laboratory effective simulation and multi-source detection system as described in claim 1, characterized in that: The specific method by which the gas chromatograph obtains internal insulation fault information of GIS is as follows: the gas chromatograph detects the composition and concentration of the decomposed gas, and judges the state of partial discharge by determining the composition and concentration of the characteristic gas after the partial discharge of SF6 gas.

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