On-site GIS equipment voltage-boosting current-rising AC voltage-withstanding test method and device

Abstract

The invention provides an on-site GIS device voltage-boosting and current-boosting AC voltage-withstanding test method and device. The method comprises the following steps: firstly, determining whether a GIS device has a fault according to a standard test; if so, excluding and repeating; if not, progressively increasing alternating current is introduced into the GIS equipment, and whether a fault occurs or not is determined every time; if yes, judging the fault as a second type of fault, and repeating after elimination; if not, testing after 20, 40, 60, 80 and 100 minutes to determine whether a fault occurs or not; if yes, judging the fault as a third type of fault, and repeating after elimination; if not, the GIS equipment is intact. The method can be used for comprehensively and accurately detecting the insulation defects of the GIS equipment, and the safety and the reliability are improved.

Description

Technical Field

[0001] The present application belongs to the field of GIS equipment experiments, and in particular to an on-site GIS equipment voltage-boosting and current-boosting AC withstand voltage test method and device. Background Art

[0002] In the power system, gas insulated switchgear (GIS) equipment is an important high-voltage electrical equipment, and its safety and reliability play a vital role in the stable operation of the entire power system. However, during the manufacturing, transportation, installation and operation of GIS equipment, insulation defects may occur due to various reasons. If these defects are not discovered and handled in time, they may cause failures during the operation of the equipment and even lead to the collapse of the entire power system.

[0003] At present, the traditional AC withstand voltage test method is mainly used to test the insulation performance of GIS equipment. This method applies a certain voltage to the GIS equipment and observes whether the equipment has a discharge signal to determine whether its insulation performance is good. However, the traditional AC withstand voltage test method has some shortcomings. For example, it can only detect the insulation performance of the equipment under the applied voltage, but cannot simulate the situation where the current and voltage are acting simultaneously during the actual operation of the equipment. Therefore, even if the equipment passes the traditional AC withstand voltage test, it is possible that insulation failure will occur during the actual operation due to the action of the current. Summary of the invention

[0004] The purpose of the present application is to overcome the problems existing in the above-mentioned prior art and to provide a method and device for an AC withstand voltage test of an on-site GIS equipment with a voltage and current boost.

[0005] The present application provides an on-site GIS equipment voltage and current boosting AC withstand voltage test method, comprising:

[0006] Conduct a voltage and current AC withstand test on GIS equipment on site according to the standard on-site AC withstand test method to determine whether the GIS equipment has a Type I fault;

[0007] If there is the first type of fault, repeat the previous step after eliminating the first type of fault;

[0008] If there is no fault, then the AC current increasing in sequence of 0.2, 0.4, 0.6, 0.8 and 1 times of the rated power frequency current is passed through the GIS equipment. After each increase, it is determined whether the GIS equipment has the first discharge signal;

[0009] If the first discharge signal is present, it is determined that the GIS equipment has a second type of fault, and the previous step is repeated after eliminating the second type of fault;

[0010] If there is no first discharge signal, then wait for 20, 40, 60, 80, and 100 minutes respectively before performing an AC withstand voltage test to determine whether the GIS equipment has a second discharge signal;

[0011] If the second discharge signal is present, it is determined that the GIS equipment has a third type of fault, and the previous step is repeated after eliminating the third type of fault;

[0012] If there is no second discharge signal, it is determined that the GIS device is intact.

[0013] Optionally, determining whether a first type of failure occurs in the GIS device includes:

[0014] Collect the electrical spectrum of the voltage and current boost AC withstand test of the on-site GIS equipment;

[0015] The type of the first type of fault is determined according to the electrical spectrum.

[0016] Optionally, the second type of fault includes: internal particle fault of GIS equipment.

[0017] Optionally, the third type of fault includes: internal spike fault, surface fault and air gap fault of GIS equipment.

[0018] Optionally, the spike fault is determined by an ultrasonic sensor.

[0019] The present application also provides an on-site GIS equipment voltage and current boosting AC withstand voltage test device, comprising:

[0020] The first experimental module is to conduct a voltage-boosting and current-boosting AC withstand voltage test on the on-site GIS equipment according to the standard on-site AC withstand voltage test method to determine whether the GIS equipment has a first-type fault; if the first-type fault occurs, repeat the previous step after eliminating the first-type fault;

[0021] In the second experimental module, if there is no fault, the AC current is increased in sequence of 0.2, 0.4, 0.6, 0.8, and 1 times of the rated power frequency current. After each increase, it is determined whether the GIS device has a first discharge signal. If the first discharge signal is present, it is determined that the GIS device has a second type of fault. After eliminating the second type of fault, the previous step is repeated.

[0022] The third experimental module, if there is no said first discharge signal, then wait for 20, 40, 60, 80, and 100 minutes respectively and then conduct an AC withstand voltage test to determine whether the GIS equipment has a second discharge signal; if there is said second discharge signal, then it is determined that the GIS equipment has a third type of fault, and the previous step is repeated after eliminating the third type of fault; if there is no said second discharge signal, then it is determined that the GIS equipment is intact.

[0023] Optionally, the first experimental module determines whether a first type of failure occurs in the GIS device, including:

[0024] Collect the electrical spectrum of the voltage and current boost AC withstand test of the on-site GIS equipment;

[0025] The type of the first type of fault is determined according to the electrical spectrum.

[0026] Optionally, the second type of fault includes: internal particle fault of GIS equipment.

[0027] Optionally, the third type of fault includes: internal spike fault, surface fault and air gap fault of GIS equipment.

[0028] Optionally, the spike fault is determined by an ultrasonic sensor.

[0029] The beneficial effects of this application are:

[0030] The present application provides an on-site GIS equipment voltage-boosting and current-raising AC withstand voltage test method, comprising: performing an on-site GIS equipment voltage-boosting and current-raising AC withstand voltage test according to a standard on-site AC withstand voltage test method to determine whether the GIS equipment has a first type of fault; if the first type of fault occurs, repeating the previous step after eliminating the first type of fault; if there is no fault, passing an AC current that increases in sequence by 0.2, 0.4, 0.6, 0.8, and 1 times the rated power frequency current through the GIS equipment, and after each increase, determining whether the GIS equipment has a first discharge signal; if the first discharge signal occurs, it is determined that the GIS equipment has a second type of fault, and the previous step is repeated after eliminating the second type of fault; if there is no first discharge signal, waiting for 20, 40, 60, 80, and 100 minutes respectively to perform an AC withstand voltage test to determine whether the GIS equipment has a second discharge signal; if the second discharge signal occurs, it is determined that the GIS equipment has a third type of fault, and the previous step is repeated after eliminating the third type of fault; if there is no second discharge signal, it is determined that the GIS equipment is intact. This application uses multi-classification experiments to more comprehensively and accurately detect insulation defects in GIS equipment, improve the safety and reliability of the equipment, and provide guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of a process flow of a voltage and current boosting AC withstand voltage test of an on-site GIS device in this application;

[0032] Figure 2 This is a schematic diagram of the AC withstand voltage test equipment for the on-site GIS equipment voltage and current boost in this application;

[0033] Figure 3This is a schematic diagram summarizing the defect discharge characteristics of GIS equipment in this application. DETAILED DESCRIPTION

[0034] The present application is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present application and implement it.

[0035] Please refer to Figure 1 As shown, the present application provides a method for an on-site GIS equipment voltage-boosting and current-boosting AC withstand voltage test, and the method is performed based on an on-site GIS equipment voltage-boosting and current-boosting AC withstand voltage test arrangement.

[0036] like Figure 2 As shown, it is a schematic diagram of the arrangement of the on-site GIS equipment voltage-boosting and current-boosting AC withstand voltage test, which mainly consists of four parts: a test transformer 1, a test current booster 4, the GIS equipment to be tested and the external connecting wire 5. The test transformer 1 mainly provides test voltage for the test. The test transformer 1 can realize program-controlled step-up. The test transformer 1 is connected to a bushing inlet or outlet of the GIS device to be tested through a non-partial discharge conductor. The test current booster 4 is a detachable through-type current booster, which is mounted on the GIS shell during the test and removed after the test. The test current booster generates power frequency current by changing the magnetic flux in a closed loop, and adjusts the current value in a program-controlled manner. The GIS device to be tested has an insulating basin 2 and a shell part 3, wherein the insulating basin with a UHF signal outlet is used to install an external UHF sensor for detecting the UHF signal generated by the discharge. Any position of the shell part can be used to set an ultrasonic sensor. The arrangement of the ultrasonic sensor is preferably installed one at a certain distance, and at least two ultrasonic sensors are installed in one air chamber. The external connecting wires 5 are respectively installed at the bushing inlet and outlet of the GIS device to be tested, and are used to form a closed loop to generate current in the loop. If the GIS device to be tested occupies a large area of ​​the ground and the distance between the two ends is far, the other phase of the three-phase GIS can also be used to connect the wire to form a closed loop.

[0037] The steps of the on-site GIS equipment voltage and current boost AC withstand voltage test method described in the present application include:

[0038] S101. Perform a voltage-boosting and current-boosting AC withstand voltage test on the on-site GIS equipment according to the standard on-site AC withstand voltage test method to determine whether the GIS equipment has a first type of fault.

[0039] Standard on-site AC withstand voltage test: The main step is to apply voltage to the GIS equipment to be put into operation and observe whether the equipment fails during the voltage application process. The test personnel will pay close attention to the performance of the equipment under the voltage. Once a discharge signal appears, it means that the equipment may have insulation or other problems. At this time, the test personnel will collect a discharge spectrum, which is a data spectrum that records the characteristics of the discharge phenomenon. By analyzing this data, the fault can be identified and diagnosed.

[0040] S102: If the first type of fault occurs, repeat the previous step after eliminating the first type of fault.

[0041] Once the fault point is identified, troubleshooting work needs to be done to repair the problem in the equipment and then the regular AC withstand voltage test needs to be carried out again.

[0042] If the equipment can pass the conventional AC withstand voltage test after repair, then this proves to a certain extent that the equipment has a high insulation reliability, so that it can be considered that the equipment can operate stably under normal voltage.

[0043] S103, if there is no fault, then the alternating current increasing in sequence of 0.2, 0.4, 0.6, 0.8 and 1 times of the rated power frequency current is passed through the GIS equipment, and after each increase, it is determined whether the GIS equipment has a first discharge signal.

[0044] After confirming that the GIS equipment to be tested has no insulation faults under power frequency voltage, the insulation performance of the equipment under boosted voltage and current conditions is further tested to find possible metal particle defects. At the beginning of the test, an AC current is first passed through the GIS equipment to be tested. These current values ​​increase in sequence according to 0.2, 0.4, 0.6, 0.8, and 1 times the rated power frequency current. This setting gradually increases the current intensity inside the equipment to simulate the current conditions in actual operation and observe the response of the equipment under different current levels.

[0045] S104: If the first discharge signal is present, it is determined that a second type of fault occurs in the GIS equipment, and the previous step is repeated after the second type of fault is eliminated.

[0046] like Figure 2 As shown in the figure, in a single test, only a single current value is applied, and then the current is waited for to stabilize. After the current stabilizes, the voltage is immediately increased step by step according to the traditional AC withstand voltage test method. This step is to observe whether the GIS equipment to be tested will have a discharge signal caused by insulation abnormality under the conditions of increasing voltage and current.

[0047] Since the above steps have determined that the GIS equipment under test has no insulation fault under the power frequency voltage, the first discharge signal that appears can only be caused by the boosting voltage and current conditions. Figure 3 The defect discharge characteristics of the GIS equipment boost and current AC withstand test are summarized to determine that the discharge signal appearing in this step is likely to be caused by metal particle defects.

[0048] Once a discharge signal is detected, the tester should stop the test immediately and perform fault identification and diagnosis based on the collected discharge spectrum. The fault type can be further confirmed by comparing the discharge spectrum with the known metal particle defect characteristics. After confirming the fault, the tester should troubleshoot and repair the metal particle defects in the equipment to ensure the safe operation of the equipment.

[0049] If the GIS device to be tested does not show the first discharge signal, it means that the device has good insulation performance under the conditions of boosted voltage and current, so the test can be continued.

[0050] S105: If the first discharge signal does not appear, wait for 20, 40, 60, 80, and 100 minutes respectively before performing an AC withstand voltage test to determine whether the GIS device has a second discharge signal.

[0051] First, a certain multiple of the rated power frequency current is applied to the GIS equipment to be tested in the previous step, and it is waited for stabilization. Then, the voltage increase test is not performed immediately, but the current is allowed to flow in the equipment for a period of time, which is 20, 40, 60, 80, and 100 minutes. The purpose of this is to allow the thermal effect of the current to fully manifest in the equipment, which may stimulate insulation defects that were not detected in the previous step.

[0052] After each waiting time, immediately increase the voltage in steps according to the traditional AC withstand voltage test method, and carefully observe whether the GIS equipment under test has discharge signals caused by insulation abnormalities. If discharge signals still appear, it is preliminarily judged that the insulation defects of the equipment may come from spikes, surface or air gaps.

[0053] S106. If the second discharge signal is present, it is determined that the GIS equipment has a third type of fault. After eliminating the third type of fault, the previous step is repeated.

[0054] Please refer to Figure 3As shown, the partial discharge inception voltage (PDIV) of the surface defects in the traditional boost mode and the boost and current (ignoring time) mode is basically the same during the test, while the PDIV increases in the boost and current (timing) mode. Therefore, if such defects exist, they can be detected in the traditional AC withstand voltage test. If the traditional AC withstand voltage test does not detect them, then they cannot be detected in the subsequent boost and current mode. After commissioning, the equipment will not have any problems due to the increase in PDIV. The particle defects are manifested as the PDIV in the boost and current (ignoring time) mode is more dispersed than that in the traditional boost mode, and there is a high probability that it is less than that in the traditional boost mode, because the vibration of the GIS equipment caused by the addition of current makes the particle defects show greater dispersion, and the vibration has a certain promoting effect on the partial discharge excitation of the particles. Therefore, if there is a defect in the test through steps S101 to S102, and it is excited in step S103, then it must be a particle defect.

[0055] The PDIV of spike defects, surface defects and air gap defects are basically the same in the traditional boost mode and the boost and current (not counting time) mode. The PDIV is reduced in the boost and current (timing) mode. However, the spike defect can collect partial discharge signals through the ultrasonic sensor, while the other two cannot. Therefore, these defects can be further distinguished by whether the partial discharge signals are collected by the ultrasonic sensor.

[0056] Therefore, in this step, if the ultrasonic sensor captures the discharge signal, it is preliminarily judged as a spike defect. If the discharge signal is not captured, but the equipment still has discharge phenomenon, it may be a surface or air gap defect. Regardless of the defect type, it is necessary to further confirm the specific location and nature of the defect based on the discharge spectrum and perform corresponding defect elimination work.

[0057] S107: If there is no second discharge signal, it is determined that the GIS device is intact.

[0058] After completing the entire process of the GIS equipment voltage and current boost AC withstand test, if the GIS equipment to be tested does not show any discharge signals caused by insulation abnormalities in each process, it is considered that the equipment has passed the comprehensive insulation performance test.

[0059] Therefore, after confirming that the equipment has no insulation defects, it will be officially put into operation. This decision is based on comprehensive insulation performance inspection and strict test procedures, ensuring the safety and reliability of GIS equipment during operation. At the same time, this also provides a strong technical guarantee for the long-term stable operation of the equipment.

[0060] The present application also provides an on-site GIS equipment voltage and current boosting AC withstand voltage test device, comprising:

[0061] The first experimental module is to conduct a voltage-boosting and current-boosting AC withstand voltage test on the on-site GIS equipment according to the standard on-site AC withstand voltage test method to determine whether the GIS equipment has a first-type fault; if the first-type fault occurs, repeat the previous step after eliminating the first-type fault;

[0062] In the second experimental module, if there is no fault, the AC current is increased in sequence of 0.2, 0.4, 0.6, 0.8, and 1 times of the rated power frequency current. After each increase, it is determined whether the GIS device has a first discharge signal. If the first discharge signal is present, it is determined that the GIS device has a second type of fault. After eliminating the second type of fault, the previous step is repeated.

[0063] The third experimental module, if there is no said first discharge signal, then wait for 20, 40, 60, 80, and 100 minutes respectively and then conduct an AC withstand voltage test to determine whether the GIS equipment has a second discharge signal; if there is said second discharge signal, then it is determined that the GIS equipment has a third type of fault, and the previous step is repeated after eliminating the third type of fault; if there is no said second discharge signal, then it is determined that the GIS equipment is intact.

[0064] Furthermore, the first experimental module determines whether the GIS equipment has a first type of failure, including:

[0065] Collect the electrical spectrum of the voltage and current boost AC withstand test of the on-site GIS equipment;

[0066] The type of the first type of fault is determined according to the electrical spectrum.

[0067] Furthermore, the second type of failure includes: internal particle failure of GIS equipment.

[0068] Furthermore, the third type of fault includes: internal spike fault, surface fault and air gap fault of GIS equipment.

[0069] Further, the spike fault is determined by an ultrasonic sensor.

[0070] 1. An on-site GIS equipment voltage and current boosting AC withstand voltage test device, characterized in that it comprises: a test transformer, a test current booster, a GIS device to be tested and an external connecting wire;

[0071] The test transformer provides the required test voltage for the test and is connected to the GIS device to be tested via a non-partial discharge conductor;

[0072] The test current booster is a detachable through-hole design, which is mounted on the housing of the GIS device to be tested during the test; the test current booster generates power frequency current by changing the magnetic flux in the closed loop, and has the function of program-controlled adjustment of the current value;

[0073] The GIS equipment to be tested includes an insulating basin, an outer shell and internal components; the insulating basin is provided with an ultra-high frequency signal outlet for installing an external ultra-high frequency sensor to detect the ultra-high frequency signal generated by discharge; the outer shell is used to set an ultrasonic sensor for further detecting the discharge signal.

[0074] The external connecting wire is used to connect the bushing inlet and outlet of the GIS device to be tested to form a closed loop, thereby generating current in the loop.

[0075] When the GIS equipment occupies a large area and the distance between the two ends is far, the other phase of the three-phase GIS is used as a connecting wire to form a closed loop.

[0076] Connection relationship description:

[0077] Connection between the test transformer and the GIS equipment to be tested:

[0078] The test transformer is directly connected to a bushing inlet or outlet of the GIS equipment to be tested through a non-partial discharge conductor to provide the required test voltage.

[0079] Connection between the test flow riser and the GIS equipment to be tested:

[0080] The test current booster is mounted on the casing of the GIS equipment and generates power frequency current by changing the magnetic flux around the casing.

[0081] There is no need for direct electrical connection between the current booster and the GIS equipment, but current is generated through magnetic field induction.

[0082] External connection wire settings:

[0083] The external connecting wires are installed at the bushing inlet and outlet of the tested GIS equipment to ensure that the current can form a closed loop.

[0084] If the GIS equipment occupies a large area, another phase of the 3-phase GIS can be used as an additional connecting wire to optimize the current loop.

[0085] Connection between the sensor and the GIS device to be tested:

[0086] The UHF sensor is installed on the UHF signal outlet of the insulating basin to detect the UHF signal generated by the discharge.

[0087] Ultrasonic sensors are installed on the outer shell of the GIS equipment, one at a certain distance, and at least two are installed in one air chamber to detect possible discharge sound signals.

[0088] In summary, the on-site GIS equipment voltage-boosting and current-boosting AC withstand voltage test device realizes a comprehensive test of the insulation performance of the GIS equipment by means of the test transformer providing voltage, the test current booster generating current, the external connecting wire forming a loop, and the sensor detecting the discharge signal.

Claims

1. A method for AC withstand voltage test of on-site GIS equipment with voltage and current boosting, characterized in that: include: Conduct a voltage and current AC withstand test on GIS equipment on site according to the standard on-site AC withstand test method to determine whether the GIS equipment has a Type I fault; If there is the first type of fault, repeat the previous step after eliminating the first type of fault; If there is no fault, then the AC current increasing in sequence of 0.2, 0.4, 0.6, 0.8 and 1 times of the rated power frequency current is passed through the GIS equipment. After each increase, it is determined whether the GIS equipment has the first discharge signal; If the first discharge signal is present, it is determined that the GIS equipment has a second type of fault, and the previous step is repeated after eliminating the second type of fault; If there is no first discharge signal, then wait for 20, 40, 60, 80, and 100 minutes respectively before performing an AC withstand voltage test to determine whether the GIS equipment has a second discharge signal; If the second discharge signal is present, it is determined that the GIS equipment has a third type of fault, and the previous step is repeated after eliminating the third type of fault; If there is no second discharge signal, it is determined that the GIS device is intact.

2. According to claim 1, a method for AC withstand voltage test of on-site GIS equipment voltage and current boosting, characterized in that: Determine whether the GIS equipment has a Type I fault, including: Collect the electrical spectrum of the voltage and current boost AC withstand test of the on-site GIS equipment; The type of the first type of fault is determined according to the electrical spectrum.

3. The AC withstand voltage test method for on-site GIS equipment voltage and current boosting according to claim 1 is characterized in that: The second type of failure includes: internal particle failure of GIS equipment.

4. The AC withstand voltage test method for on-site GIS equipment voltage and current boosting according to claim 1 is characterized in that: The third type of faults include: internal spike faults, surface faults and air gap faults of GIS equipment.

5. The AC withstand voltage test method for boosting voltage and current of on-site GIS equipment according to claim 4 is characterized in that: The spike fault is determined by an ultrasonic sensor.

6. An on-site GIS equipment voltage and current boosting AC withstand voltage test device, characterized in that: include: The first experimental module is to conduct a voltage-boosting and current-boosting AC withstand voltage test on the on-site GIS equipment according to the standard on-site AC withstand voltage test method to determine whether the GIS equipment has a first-type fault; if the first-type fault occurs, repeat the previous step after eliminating the first-type fault; In the second experimental module, if there is no fault, the AC current is increased in sequence of 0.2, 0.4, 0.6, 0.8, and 1 times of the rated power frequency current. After each increase, it is determined whether the GIS device has a first discharge signal. If the first discharge signal is present, it is determined that the GIS device has a second type of fault. After eliminating the second type of fault, the previous step is repeated. The third experimental module, if there is no said first discharge signal, then wait for 20, 40, 60, 80, and 100 minutes respectively and then conduct an AC withstand voltage test to determine whether the GIS equipment has a second discharge signal; if there is said second discharge signal, then it is determined that the GIS equipment has a third type of fault, and the previous step is repeated after eliminating the third type of fault; if there is no said second discharge signal, then it is determined that the GIS equipment is intact.

7. The AC withstand voltage test device for boosting and current of on-site GIS equipment according to claim 6 is characterized in that: The first experimental module determines whether the GIS equipment has a first type of failure, including: Collect the electrical spectrum of the voltage and current boost AC withstand test of the on-site GIS equipment; The type of the first type of fault is determined according to the electrical spectrum.

8. The on-site GIS equipment voltage and current boosting AC withstand voltage test device according to claim 6, characterized in that: The second type of failure includes: internal particle failure of GIS equipment.

9. The AC withstand voltage test device for boosting voltage and current of on-site GIS equipment according to claim 6, characterized in that: The third type of faults include: internal spike faults, surface faults and air gap faults of GIS equipment.

10. The on-site GIS equipment voltage and current boosting AC withstand voltage test device according to claim 9, characterized in that: The spike fault is determined by an ultrasonic sensor.

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