Three-phase common box type GIS equipment on-site voltage-boosting and current-boosting test method and device

Abstract

The invention provides a three-phase common box type GIS equipment on-site voltage-boosting and current-boosting test method and device. The method comprises the steps that GIS equipment is installed and inflated to rated pressure, the GIS equipment, a cross-core induction current booster and resonance voltage-withstanding equipment are connected in series, the middle of a long branch bus serves as a current booster installation point, and two outgoing line intervals are in short circuit to form a test loop in a same-phase mode. And closing the isolating switch and the circuit breaker, applying alternating voltage to the resonance voltage-withstanding equipment, and monitoring the voltage, the current and the GIS state. And then the circuit breaker, the isolating switch and the power supply are disconnected. According to the method, the straight-through current booster is used for synchronously applying the pressure current, the operation condition is simulated, and the defect detection accuracy and reliability are improved.

Description

Technical Field

[0001] The present application belongs to the field of GIS equipment testing, and in particular, relates to a method and device for on-site voltage and current boosting testing of three-phase common-box GIS equipment. Background Art

[0002] Gas-insulated metal-enclosed switchgear (GIS) equipment is a key main equipment in modern substations, and its operating quality is directly related to the reliability of power supply to the power grid. GIS equipment is enclosed in SF6 insulating gas with a certain pressure. This design enhances the insulation performance of the equipment, but also brings difficulties in observing and maintaining the internal operating status of the equipment. During the operation of GIS equipment, if a fault such as flashover occurs, it may cause the line to stop operating at the least, or even cause the entire station to stop operating, causing large-scale power outages, posing a serious threat to the stable operation of the power grid.

[0003] Although existing GIS equipment status monitoring methods can evaluate the equipment status to a certain extent, the defect handling in the operation stage is often long and labor-intensive, and it is difficult to fully cover all potential problems. Therefore, one of the key methods is to move the detection of GIS equipment defects forward, that is, to conduct detailed tests and inspections during the equipment installation and commissioning stages to ensure that the equipment reaches the best state before it is put into operation.

[0004] Traditional GIS equipment on-site acceptance tests usually use conventional AC withstand voltage belt ultrasonic partial discharge detection tests. However, this method has the problem of underreporting defects, especially the limited effect of detecting poor installation defects. Summary of the invention

[0005] The purpose of this application is to overcome the defects in the above-mentioned prior art and provide a method and device for on-site voltage and current boosting test of three-phase common box GIS equipment.

[0006] The present application provides a method for testing on-site voltage and current boosting of a three-phase common box GIS device, comprising:

[0007] Inflate the interior of the GIS device to a rated pressure, wherein the GIS device is a three-phase common box type;

[0008] Connect the GIS device, the through-type induction current riser and the resonant withstand voltage device in series: select the middle of the relatively long branch busbar of the GIS device as the installation point of the through-type induction current riser;

[0009] The same phase of the two outgoing line intervals of the GIS equipment is selected as the two ends of the test loop and the test line is short-circuited to form a test loop;

[0010] Close the isolating switches and circuit breakers included in the test circuit in sequence;

[0011] Apply an AC voltage to the test circuit using the resonant withstand voltage device to keep the internal conductor of the GIS device and the test line under the AC voltage;

[0012] Monitoring the applied voltage value, current value and status parameters of the GIS equipment;

[0013] Disconnect the circuit breaker and isolating switch in sequence, disconnect the test power supply, and complete the test.

[0014] Optionally, the through-type induction current riser comprises an iron choke with a side opening;

[0015] The opening size of the iron choke is larger than the shell size of the three-phase GIS equipment in one box, and the three-phase GIS equipment in one box is completely enclosed in the opening surrounded by the iron core of the through-type induction current riser.

[0016] Optionally, applying an AC voltage to the test circuit using the resonant withstand voltage device includes:

[0017] The core secondary side is formed based on the three-phase GIS equipment loop through the through-type induction current booster, an alternating current is applied to the core primary side to generate an alternating magnetic field, and a current is induced in the core secondary side.

[0018] Optionally, both ends of the test line are provided with wire clamps for tightly connecting with the bushing terminals of the outlet interval.

[0019] Optionally, the method further includes: hanging the test line at a middle position by an insulating rope.

[0020] Optionally, the three-phase GIS equipment in the same box maintains single-point grounding during the test.

[0021] Optionally, the same phase of the two outgoing line intervals of the three-phase GIS equipment in the same box is selected as the two ends of the test loop, and the test line is short-circuited to form a test loop, including:

[0022] The outlet bushing terminals of the non-test phases remain suspended.

[0023] The present application also provides a three-phase common box GIS equipment on-site voltage and current boosting test device, which is characterized by comprising:

[0024] An air filling module is used to fill the interior of the GIS device to a rated pressure, wherein the GIS device is a three-phase common box type;

[0025] A series connection module is used to connect the GIS device in series with a through-type induction current riser and a resonant withstand voltage device: the middle of the relatively long branch busbar of the GIS device is selected as the installation point of the through-type induction current riser;

[0026] A short-circuit module is used to select the same phase of the two outgoing line intervals of the GIS equipment as the two ends of the test loop, and short-circuit the test line to form a test loop;

[0027] An operating module, used for sequentially closing the isolating switches and circuit breakers included in the test circuit;

[0028] A pressure module, used for applying an AC voltage to the test circuit using the resonant withstand voltage device, so as to keep the internal conductor of the GIS device and the test line bearing the AC voltage;

[0029] A detection module, used to monitor the applied voltage value, current value and status parameters of the three-phase GIS equipment;

[0030] The end module is used to disconnect the circuit breaker and the isolating switch in sequence, disconnect the test power supply, and complete the test. Optionally, using the resonant withstand voltage device to apply an AC voltage to the test circuit includes:

[0031] The pressurizing module regards the three-phase GIS equipment loop in a common box as the secondary side of the iron core through the through-type induction current booster, applies alternating current to the primary side of the iron core to generate an alternating magnetic field, and induces current in the three-phase GIS equipment loop in a common box.

[0032] Optionally, the test line is suspended by a crane through an insulating wire at an intermediate position.

[0033] The beneficial effects of this application are:

[0034] The present application provides a method for on-site voltage and current boosting test of a three-phase common box GIS device, comprising: inflating the interior of the GIS device to the rated pressure, wherein the GIS device is a three-phase common box type; connecting the GIS device in series with a through-type inductive current booster and a resonant withstand voltage device: selecting the middle of the relatively long branch busbar of the GIS device as the installation point of the through-type inductive current booster; selecting the same phase of the two outgoing line intervals of the GIS device as the two ends of the test loop and short-circuiting the test line to form a test loop; closing the isolating switch and circuit breaker contained in the test loop in sequence; using the resonant withstand voltage device to apply an AC voltage to the test loop, keeping the internal conductor of the GIS device and the test line under the AC voltage; monitoring the applied voltage value, current value and status parameters of the GIS device; disconnecting the circuit breaker and isolating switch in sequence, disconnecting the test power supply, and completing the test. The present application applies voltage and current to the GIS device at the same time through a through-type inductive current booster to simulate actual operating conditions and improve the accuracy and reliability of defect detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1This is a schematic diagram of the on-site voltage and current boosting test process of the three-phase common box GIS equipment in this application;

[0036] Figure 2 It is a schematic diagram of the on-site pressure and current boosting test device for GIS equipment in this application;

[0037] Figure 3 It is a schematic diagram of a through-type induction riser in this application;

[0038] Figure 4 This is a schematic diagram of the installation of the through-hole induction riser in this application. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that various forms of implementing the present disclosure should not be limited by the embodiments set forth herein. On the contrary, the embodiments are provided to more thoroughly understand the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] Please refer to Figure 1 As shown, a method for on-site voltage and current boosting test of three-phase common box GIS equipment comprises the following steps:

[0041] S101. Inflate the interior of the GIS device to a rated pressure, wherein the GIS device is a three-phase common box type.

[0042] Please refer to Figure 2 As shown, the on-site voltage and current raising test device for GIS equipment includes: a through-type induction current booster 1, a disconnector 2, a circuit breaker 3, a disconnector 4, a busbar 5, a disconnector 6, a circuit breaker 7, a disconnector 8, a busbar 9, a disconnector 10, a circuit breaker 11, a disconnector 12, a disconnector 13, a disconnector 14, an incoming line interval 15, an incoming line interval 16, an outgoing line interval 17, an outgoing line interval 18, a special test line 19, a flame retardant rope 20, a series resonant withstand voltage device 21 and a crane 22.

[0043] The three-phase GIS equipment (Gas Insulated Switchgear) is a highly integrated substation equipment. Its main feature is that high-voltage electrical equipment such as circuit breakers, disconnectors, current transformers, voltage transformers, etc. are enclosed in a metal casing and filled with SF6 insulating gas at a certain pressure to achieve insulation and arc extinguishing of the electrical equipment. This design makes the GIS equipment have the advantages of small footprint, high operational reliability, and low maintenance workload.

[0044] In a three-phase GIS device, the three-phase conductors are enclosed in the same metal casing, and the three phases are isolated from each other by insulating partitions, but share a common casing. This design helps to reduce the footprint, improve space utilization, and simplify the installation and maintenance process of the equipment.

[0045] When installing the three-phase common box GIS equipment, first check whether the components of the three-phase common box GIS equipment are intact and ensure that there are no missing, deformed or damaged components. After cleaning the internal space of the GIS equipment, fill the equipment with SF6 gas to the rated pressure through the specified interface and ensure good sealing to prevent gas leakage.

[0046] Connect various accessories on GIS equipment, including but not limited to insulators, current transformers, voltage transformers, etc., and ensure that the connections are tight and not loose. Complete the connection of electrical conductors inside GIS equipment, ensure the phase sequence is correct, and check the phase according to the requirements of the design drawings.

[0047] Configure the grounding system of the GIS equipment to ensure reliable grounding to meet the requirements of safety and equipment operation. If single-point grounding operation is required during the test, make corresponding preparations in advance.

[0048] According to the system design, install and set up operating equipment such as disconnectors and circuit breakers, and ensure that they can be opened and closed reliably. Conduct safety inspections throughout the equipment installation process, including the wearing of personal protective equipment, electrical insulation inspections, and protective measures for the surrounding environment, to ensure the safety of construction personnel and equipment.

[0049] After the overall installation of the GIS equipment is completed, check again whether the gas pressure meets the requirements and conduct an air tightness test to ensure that the GIS equipment can operate safely and stably under the specified air pressure environment.

[0050] S102, connecting the GIS device in series with a through-type induction current riser and a resonant voltage-withstand device: selecting the middle of the relatively long branch busbar of the GIS device as the installation point of the through-type induction current riser.

[0051] The through-type induction current booster is a special device used to apply alternating current in the on-site voltage and current boosting test of three-phase common box GIS equipment. It uses the principle of electromagnetic induction, regards the GIS equipment circuit as the secondary side of the iron core, and generates an alternating magnetic field by applying alternating current on the primary side of the iron core, thereby inducing current in the GIS equipment circuit, simulating the current state of the GIS equipment in actual operation.

[0052] like Figure 3As shown, the through-core induction current riser includes an upper iron choke 201, a lower iron choke 202, a left iron choke 203, and a right iron choke 204, wherein one side of the iron choke (such as the left side iron choke 201) can be opened to facilitate installation on the GIS equipment housing. The core opening size must be larger than the outer diameter of the GIS equipment housing to ensure that the GIS equipment can be completely enclosed in the core.

[0053] The primary coil 205 is wound around the yoke 203 on the fixed side and is used to pass an alternating current to generate a magnetic field.

[0054] Since the GIS equipment is already filled with insulating gas (SF6), the through-type induction current booster does not require complex external insulation coating, which reduces the equipment cost and complexity. At the same time, the insulation design of the primary coil and open iron choke of the current booster must meet the test voltage requirements.

[0055] like Figure 4 As shown, a hydraulic adjustment mechanism 302 is used to adjust a hydraulically adjustable support frame 301 moved by a ground wheel 303 to the height of the branch busbar. A crane 304 is used to hang the flow riser above the support frame until the GIS cylinder 305 is completely inside the flow riser core, and then the crane lowers the open iron choke and presses the iron choke against the side iron choke.

[0056] The through-type induction current booster is usually installed in the middle of the branch busbar of the GIS equipment housing, and is installed using a movable, hydraulically adjustable support frame. During installation, the GIS equipment loop must first pass through the iron core, and then close the open iron choke. To ensure that the current only passes through the internal conductor loop of the GIS equipment, the remaining grounding points on the GIS equipment housing must be released to achieve single-point grounding, so as to avoid the housing and the grounding grid forming a loop and offsetting the magnetic field in the core of the current booster.

[0057] The working principle of the through-type induction current booster is similar to that of a transformer. When an alternating current is passed through the primary coil, an alternating magnetic field is generated in the iron core, thereby inducing a current in the conductor loop inside the GIS equipment (i.e., the secondary side). Since the GIS equipment housing is filled with insulating gas, the current booster does not require a complex external insulation design.

[0058] Resonance withstand voltage equipment is a special equipment used to perform AC withstand voltage test on GIS equipment. It generates resonance phenomenon and applies high voltage to GIS equipment to test its insulation performance.

[0059] The resonant withstand voltage equipment contains a resonant circuit, which is composed of components such as inductance, capacitance and resistance, and can produce resonance at a specific frequency. When the resonant circuit works at the resonant frequency, it can output a high voltage, which is applied to the GIS equipment for withstand voltage testing.

[0060] Resonant withstand voltage equipment is usually equipped with a voltage regulator and a control system to adjust the output voltage and monitor the test process. To ensure test safety, resonant withstand voltage equipment is usually also equipped with safety mechanisms such as overvoltage protection and overcurrent protection.

[0061] The working principle of the resonant withstand voltage equipment is based on the characteristics of the resonant circuit. At a specific frequency, the inductance, capacitance and resistance elements in the resonant circuit interact with each other to produce a resonance phenomenon. At this time, the voltage and current in the circuit will increase significantly to reach the required high voltage level. This high voltage is applied to the GIS equipment to evaluate its insulation performance. During the test, the output voltage is adjusted and monitored by the voltage regulator and control system to ensure the safety and accuracy of the test process.

[0062] Select the middle position of the branch busbar with a longer GIS equipment shell to install the through-type induction flow riser. Use a movable and hydraulically adjustable support frame to support the flow riser to a predetermined height and ensure its stability.

[0063] Lift the through-type induction current riser above the GIS equipment housing, and lift the iron choke on the open side of the through-type induction current riser to be flush with the upper iron choke. Use a crane to slowly pass the GIS equipment cylinder through the current riser core until it is completely inside the core, then lower the open iron choke and press it tightly.

[0064] The resonant withstand voltage device is connected to the loop formed by the GIS device to apply an AC voltage.

[0065] Debug the resonant withstand voltage equipment to ensure that it can operate stably according to the set parameters.

[0066] Perform single-point grounding on the casing of the GIS equipment and disconnect the remaining grounding points in the loop from the casing.

[0067] If there is a grounding point that cannot be removed, insulation isolation treatment must be performed on the pot-type insulators on both sides of the branch bus of the current booster set.

[0068] After completing the above installation, conduct a comprehensive inspection of the system to ensure that all connections are reliable and well insulated.

[0069] S103, selecting the same phase of the two outgoing line intervals of the GIS equipment as the two ends of the test loop and short-circuiting them with a test line to form a test loop.

[0070] At the two outgoing line intervals of the GIS equipment, select the outgoing line bushing of the same phase (such as phase B).

[0071] Use a special test wire to short-circuit the two outlet bushings to form a current loop. The special test wire must meet the current-carrying area requirements when large current passes through and the anti-corona requirements under large voltage, and both ends must have wire clamps for tight connection.

[0072] Preferably, the special test line has wire clamps at both ends to facilitate tight connection with the outlet bushing terminals of the outlet intervals; in addition, since the distance between the two outlet intervals cannot be determined, the special test line can be made into multiple sections and adjusted according to the on-site test distance.

[0073] Furthermore, after the special test line is short-circuited to form a loop and an alternating current is applied to the loop, the air gap between the special test line and the ground and ancillary facilities should meet the insulation distance requirements. In order to prevent the line from hanging too close to the ground, a crane is required to lift the test line from the middle of the special test line, which can also prevent the special test line from being damaged by the excessive weight of the special test line. When the crane is used to lift, a section of insulated flame-retardant rope is used between the hook and the special test line. The length should meet the insulation requirements of the applied AC voltage. The flame-retardant rope can meet the heating temperature requirements caused by the large current flowing through the special test line. Generally, its ignition point should be greater than 75K.

[0074] According to the situation that a large current cannot be applied to the internal conductor of the GIS equipment, it is necessary to destroy the loop formed by the GIS equipment casing, grounding, and grounding grid. Therefore, the GIS equipment loop formed needs to form a single-point grounding to release the remaining grounding points on the casing in the loop. When the grounding cannot be released or there is no insulation partition between the GIS equipment casing and its supporting frame, it is necessary to make an insulation partition at the pot-type insulator on one side of the GIS cylinder equipped with a through-type induction current riser. It is necessary to ensure that the pot-type insulator has no outer metal shielding ring, remove the pot-type insulator jumper, and install insulating gaskets on both sides of the pot-type insulator fixing bolts to artificially isolate the loop formed between the casing and the grounding.

[0075] According to the method of applying AC current to the internal conductor of GIS by using a through-hole induction current booster, for GIS equipment arranged in a three-phase common box, if the outlet bushings of the other two-phase GIS equipment outlet intervals that are not being tested are short-circuited and grounded, the other two phases will also form a loop through the grounding grid. To avoid this situation, the outlet bushing terminals of the other two-phase GIS equipment outlet intervals that are not being tested should be left suspended.

[0076] S104. Close the isolating switch and circuit breaker included in the test circuit in sequence.

[0077] First, close the isolating switch 2 to ensure that the isolation state of this circuit section is released.

[0078] Next, the circuit breaker 3, the isolating switch 4, and the isolating switch 6 are closed in sequence to gradually release the isolation status of each section in the circuit.

[0079] Close the circuit breaker 7 to allow the current to flow to the next circuit.

[0080] Then close the isolating switch 8, the isolating switch 10 and the circuit breaker 11 to continue to expand the range of the circuit.

[0081] Finally, the isolating switch 12 is closed. At this point, all the isolating switches involved have been closed, forming a complete current loop.

[0082] After closing all disconnectors and circuit breakers, check for missing or incorrect connections in the loop. Make sure all grounding switches are in the open position to avoid unnecessary grounding loops.

[0083] S105. Use the resonant withstand voltage device to apply an AC voltage to the test circuit, and keep the internal conductor of the GI S device and the test line under the AC voltage.

[0084] Ensure that the three-phase GIS equipment has been installed and enclosed in the GIS casing, and the interior of the equipment has been inflated to the rated pressure to meet the insulation requirements.

[0085] Check that the resonant withstand voltage equipment and its related auxiliary equipment (such as voltage regulator, reactive power compensation device, power switch cabinet, measurement display control system, etc.) are in good working condition and are correctly connected to the test circuit.

[0086] Connect the power supply of the resonant withstand voltage device and check whether the power connection is firm and reliable. Confirm that the power supply voltage meets the working requirements of the resonant withstand voltage device.

[0087] According to the rated voltage and test requirements of the three-phase GIS equipment, the output voltage, frequency and other parameters of the resonant withstand voltage equipment are set through the measurement display control system.

[0088] Ensure that the set parameters are within the safe operating range of the equipment and comply with relevant standards and specifications.

[0089] Close the isolating switches and circuit breakers included in the test circuit in sequence, such as isolating switch 2, circuit breaker 3, isolating switch 4, etc., until a complete current circuit is formed. Ensure that during the closing process, the operation of each switch is correct and no abnormal phenomenon occurs. Confirm that all safety measures are in place and the test circuit has formed a complete closed state.

[0090] Start the resonant voltage withstand equipment and begin to apply AC voltage to the test circuit.

[0091] During the test, the internal conductors and test lines of the three-phase GIS equipment in the same box are kept under the applied AC high voltage. Ensure that the insulation performance of the GIS equipment and the test circuit is good, and there is no breakdown or discharge.

[0092] S106. Monitor the applied voltage value, current value and status parameters of the GIS equipment.

[0093] During the voltage application process, the output voltage, current, power and other parameters are monitored in real time through the measurement display control system. If any abnormal situation is found (such as excessive voltage fluctuation, abnormal current, etc.), the test should be stopped immediately and the cause should be checked.

[0094] Adjust the parameters of the resonant withstand voltage equipment according to actual conditions to ensure a safe and stable test process.

[0095] S107, disconnect the circuit breaker and the isolating switch in sequence, disconnect the test power supply, and complete the test.

[0096] When the test reaches the scheduled time or completes the scheduled test items, stop the operation of the resonant voltage withstand equipment.

[0097] Disconnect the circuit breakers and isolating switches in the test circuit in sequence to restore the GIS equipment to a safe state.

[0098] Check whether the GIS equipment and its related components are damaged or have any abnormal conditions.

[0099] Record various parameters and observations during the test to provide a basis for subsequent analysis and evaluation.

[0100] The present application also provides a three-phase common box GIS equipment on-site voltage and current boosting test device, comprising:

[0101] Installation module operation: Fix the three-phase common box GIS equipment in the predetermined test area to ensure that the equipment is stable and safe. Inflate the inside of the GIS equipment until it reaches its rated pressure standard, and check the sealing to ensure there is no leakage.

[0102] Series module configuration: According to the layout of GIS equipment, select the middle of the longer branch bus as the installation location of the through-type induction current riser. Ensure that the installation point is flat and free of debris to facilitate the stable installation of the current riser. Connect the through-type induction current riser, resonant withstand voltage equipment and GIS equipment in series through special connectors to form a complete test circuit.

[0103] Short-circuit module setting: In the two outgoing line intervals of the GIS equipment, select the same phase as the test object. Use the test line to short-circuit the two outgoing line intervals to ensure that the short-circuit is in good contact and not loose. To ensure safety, the test line is hoisted in the middle position with an insulated wire through a crane to avoid contact with the ground or other metal parts.

[0104] The operation module executes: according to the predetermined order, the isolating switches and circuit breakers included in the test circuit are closed in sequence to ensure that the test circuit is completely closed and the power-on status is normal.

[0105] Pressurization module works: start the resonant withstand voltage equipment and pressurize the GIS equipment circuit through the through-core induction current booster. At this time, the GIS equipment circuit is regarded as the secondary side of the iron core, and an alternating current is applied to the primary side of the iron core to generate an alternating magnetic field, thereby inducing the required test current in the GIS equipment circuit.

[0106] Monitor and adjust the output voltage and frequency of the resonant withstand voltage equipment to ensure that the internal conductors and test lines of the GIS equipment can withstand stable high voltage and current.

[0107] Detection module application: Use high-precision measuring instruments to monitor and record the applied voltage, current values, and status parameters of GIS equipment (such as temperature, partial discharge, etc.) in real time.

[0108] Pay close attention to the operating status of GIS equipment. If any abnormality is found, stop the test immediately and check the cause.

[0109] End module execution: After completing the scheduled test cycle or reaching the test target, disconnect the circuit breaker and disconnector in turn to ensure that the test circuit is completely disconnected. Cut off the test power supply, remove all connecting wires and test equipment, and restore the GIS equipment to its original state. Clean up the test site to ensure that there are no leftover items and safety hazards.

[0110] Although the present invention is disclosed as above by the embodiments, it is not intended to limit the protection scope of the present invention. Any changes and modifications made by any technician familiar with the technology without departing from the concept and scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A three-phase common box GIS equipment on-site voltage and current increase test method, characterized in that: include: Inflate the interior of the GIS device to a rated pressure, wherein the GIS device is a three-phase common box type; Connect the GIS device, the through-type induction current riser and the resonant withstand voltage device in series: select the middle of the relatively long branch busbar of the GIS device as the installation point of the through-type induction current riser; The same phase of the two outgoing line intervals of the GIS equipment is selected as the two ends of the test loop and the test line is short-circuited to form a test loop; Close the isolating switches and circuit breakers included in the test circuit in sequence; Apply an AC voltage to the test circuit using the resonant withstand voltage device to keep the internal conductor of the GIS device and the test line under the AC voltage; Monitoring the applied voltage value, current value and status parameters of the GIS equipment; Disconnect the circuit breaker and isolating switch in sequence, disconnect the test power supply, and complete the test.

2. According to the on-site voltage and current increasing test method of three-phase common box GIS equipment according to claim 1, it is characterized in that: The through-hole induction current riser comprises an iron choke with a side opening; The opening size of the iron choke is larger than the shell size of the three-phase GIS equipment in one box, and the three-phase GIS equipment in one box is completely enclosed in the opening surrounded by the iron core of the through-type induction current riser.

3. According to the on-site voltage and current increasing test method of three-phase common box GIS equipment in claim 1, it is characterized in that: Applying an AC voltage to the test circuit using the resonant withstand voltage equipment includes: The core secondary side is formed based on the three-phase GIS equipment loop through the through-type induction current booster, an alternating current is applied to the core primary side to generate an alternating magnetic field, and a current is induced in the core secondary side.

4. According to the on-site voltage and current boosting test method for three-phase co-box GIS equipment according to claim 1, it is characterized in that: The test line has wire clamps at both ends for tight connection with the bushing terminals at the outlet intervals.

5. According to the on-site voltage and current boosting test method for three-phase co-box GIS equipment according to claim 1, it is characterized in that: Also includes: The test wire is suspended at a mid-position by an insulating rope.

6. The on-site voltage and current boosting test method for three-phase co-box GIS equipment according to claim 1 is characterized in that: The three-phase GIS equipment in the same box maintains single-point grounding during the test.

7. The on-site voltage and current boosting test method for three-phase co-box GIS equipment according to claim 1 is characterized in that: Select the same phase of the two outgoing line intervals of the three-phase GIS equipment as the two ends of the test loop, and short-circuit the test line to form a test loop, including: The outlet bushing terminals of the non-test phases remain suspended.

8. A three-phase common box GIS equipment on-site voltage and current boost test device, characterized in that: include: An air filling module is used to fill the interior of the GIS device to a rated pressure, wherein the GIS device is a three-phase common box type; A series connection module is used to connect the GIS device in series with a through-type induction current riser and a resonant withstand voltage device: the middle of the relatively long branch busbar of the GIS device is selected as the installation point of the through-type induction current riser; A short-circuit module is used to select the same phase of the two outgoing line intervals of the GIS equipment as the two ends of the test loop, and short-circuit the test line to form a test loop; An operating module, used for sequentially closing the isolating switches and circuit breakers included in the test circuit; A pressure module, used for applying an AC voltage to the test circuit using the resonant withstand voltage device, so as to keep the internal conductor of the GIS device and the test line bearing the AC voltage; A detection module, used to monitor the applied voltage value, current value and status parameters of the three-phase GIS equipment; The end module is used to disconnect the circuit breaker and the isolating switch in sequence, disconnect the test power supply, and complete the test.

9. The on-site voltage and current boosting test device for three-phase common box GIS equipment according to claim 8 is characterized in that: Applying an AC voltage to the test circuit using the resonant withstand voltage equipment includes: The pressurizing module regards the three-phase GIS equipment loop in a common box as the secondary side of the iron core through the through-type induction current booster, applies alternating current to the primary side of the iron core to generate an alternating magnetic field, and induces current in the three-phase GIS equipment loop in a common box.

10. The on-site voltage and current boosting test device for three-phase common box GIS equipment according to claim 8 is characterized in that: The test wire is suspended at a middle position by a crane through an insulating wire.

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