Boost equipment heightening device for GIS / GIL alternating current voltage withstand test

Abstract

The invention discloses a boosting equipment heightening device for a GIS / GIL alternating current withstand voltage test. The boosting equipment heightening device comprises a base body, a supporting assembly and a height adjusting mechanism. The base main body is used for being arranged above a height adjusting mechanism and is provided with a mounting interface matched with a high-voltage interface of tested GIS / GIL (Gas Insulated Switchgear / Gas Insulated Line) equipment; the height adjusting mechanism is arranged between the bottom end of the base main body and the top end of the boost reactor and is used for adjusting the vertical height from the top end of the base main body to the ground; and the supporting assembly is used for connecting the bottom end of the base main body with the top end of the boost reactor so as to prevent the base main body from shaking. Therefore, the test safety and the test efficiency are improved, and the test cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of GIS / GIL equipment test, and particularly to a boosting device heightening device for GIS / GIL AC withstand voltage test. BACKGROUND

[0002] In the power system, the GIS / GIL equipment has a high integration, and the outlet bushing installation height thereof is usually high. When performing the GIS / GIL equipment AC withstand voltage test, the boosting device (usually a boosting reactor) needs to be used to apply high voltage to the GIS / GIL equipment.

[0003] However, the height of the conventional boosting reactor is fixed, and the height difference between the boosting reactor and the tested GIS / GIL equipment is large. Such height difference has the following problems:

[0004] a) The safety distance between the other electrical equipment below the high-voltage lead connecting the outlet bushing and the boosting reactor and the test lead is insufficient. Taking the AC withstand voltage of 592 kV as an example, according to the requirements of the Electric Safety Work Procedures-High Voltage Test Room Part, the safety distance between the high-voltage lead and the surrounding structure, equipment, and building should not be less than 4.5 meters.

[0005] b) The high-voltage lead between the boosting reactor and the tested GIS / GIL equipment is too long due to the large height difference, resulting in large line loss and tension, and affecting the test quality.

[0006] Therefore, it is urgent to design a technical solution for increasing the height of the boosting device for GIS / GIL AC withstand voltage test. SUMMARY

[0007] In view of this, the present application provides a boosting device heightening device for GIS / GIL AC withstand voltage test, aiming to solve the problem of poor test quality caused by the large height difference between the boosting device and the GIS / GIL equipment in the prior art.

[0008] The present application provides a boosting device heightening device for GIS / GIL AC withstand voltage test, comprising:

[0009] a base body, a support assembly, and a height adjusting mechanism;

[0010] The base body is arranged above the height adjusting mechanism, and is provided with a mounting interface matched with the high-voltage interface of the tested GIS / GIL equipment;

[0011] The height adjusting mechanism is arranged between the bottom end of the base body and the top end of the boosting reactor, and is used to adjust the vertical height of the top end of the base body from the ground;

[0012] A support assembly is used to connect the bottom end of the base body with the top end of the booster reactor to prevent the base body from shaking.

[0013] Further, the base body is made of epoxy resin and has an upper surface provided with a mounting groove matched with the high-voltage interface of the GIS / GIL device under test and a lower surface connected with the height adjusting mechanism through an insulating bolt set.

[0014] Further, the insulating bolt set comprises high-voltage insulating bolts.

[0015] The high-voltage insulating bolts have a tensile strength of 1500 MPa and a voltage range of 10 kV to 1000 kV, and a long-term working temperature of 170-210℃.

[0016] Further, the upper surface of the base body is covered with an epoxy resin-based composite insulating plate, and the edge of the composite insulating plate extends to the outside of the side wall by more than 50 mm; and a silicon rubber skirt is additionally installed on the side wall.

[0017] Further, the height adjusting mechanism adopts a threaded lifting structure, comprising a threaded rod extending in the vertical direction and a threaded sleeve sleeved outside the threaded rod; the bottom end of the threaded rod is fixed to the top end of the reactor, and the top end of the threaded sleeve is connected with the base body through a bolt set; the vertical height of the top end of the base body from the ground is adjusted by rotating the threaded sleeve to lift its top end.

[0018] Further, the bolt set comprises a plurality of high-voltage insulating bolts, which are connected with the flange provided at the top end of the threaded sleeve through the fixing holes on the lower surface of the base body and are secured by cooperating with lock nuts.

[0019] The high-voltage insulating bolts are connected with the fixing holes on the top end of the reactor through the flange provided at the bottom end of the threaded rod and are secured by cooperating with lock nuts.

[0020] Further, the support assembly comprises a plurality of groups of telescopic guide columns; the telescopic guide columns are respectively and insulatively connected with the bottom end of the base body and the top end of the booster reactor.

[0021] Further, the height adjusting mechanism adopts a hydraulic scissors prop; the hydraulic scissors prop is provided with at least two rows of scissors forks; the bottom end of the scissors prop is fixed to the top end of the reactor, and the top end of the scissors prop is connected with the base body through a bolt set; the base body is lifted by expanding the scissors prop through hydraulic control.

[0022] Further, the height adjusting mechanism adopts a multi-stage telescopic hydraulic cylinder; the cylinder barrel of the hydraulic cylinder is fixedly connected to the top end of the reactor, and the top end of the extending rod of the hydraulic cylinder is connected with the base body through a bolt set; the base body is lifted by gradually extending the hydraulic cylinder through hydraulic control.

[0023] Further, the height adjusting mechanism adopts a stepper motor to drive at least one set of ball screw;

[0024] The ball screw is provided with a guide rod;

[0025] The bottom end of the screw rod is fixedly connected to the top end of the reactor, and the top end of the screw rod is connected to the base body through a bolt set;

[0026] The screw rod is extended by motor control, and the base body is raised.

[0027] The height-adjustable base provided by the voltage boosting device height increasing device for GIS / GIL AC withstand voltage test solves the problem of height mismatch between the reactor and the tested GIS / GIL device; the combination of the support assembly and the insulating base takes into account the structural stability and electrical safety; the height adjusting mechanism can be flexibly adapted to GIS / GIL devices of different heights, and has strong versatility.

[0028] The voltage boosting device height increasing device for GIS / GIL AC withstand voltage test improves the safety of the test, greatly improves the verticality of the lead wire and greatly reduces the probability of tip discharge due to the insulating base body; improves the test efficiency, and greatly shortens the time of building a test loop; can perform single-station withstand voltage test, can significantly save the cost of a crane, and save the test cost.

[0029] Additional aspects and advantages of the application will be described in the following description, some of which will become apparent to those skilled in the art from the following description, some of which will become apparent to those skilled in the art from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0030] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the application. Moreover, the same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0031] Figure 1 The figure is a schematic diagram of the voltage boosting device height increasing device for GIS / GIL AC withstand voltage test according to an embodiment of the application;

[0032] Figure 2 The figure is a wiring schematic diagram of 1100kV GIS / GIL field AC withstand voltage test of a certain comprehensive pipe gallery project. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are illustrated in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. It is to be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0034] Gas Insulated Switchgear (GIS) and Gas Insulated Transmission Line (GIL) bear the heavy responsibility of power system load control, safety protection and power transmission. The wide promotion of GIS / GIL effectively relieves the power supply pressure caused by lack of urban land resources, rapid increase of power load and high reliability demand.

[0035] Gas Insulated Transmission Line adopts SF6 or other gas insulation, and the shell is coaxially arranged with the conductor. It is a high-voltage, large-current, long-distance power transmission equipment, which has the significant advantages of large transmission capacity, small occupation, flexible layout, high reliability, small maintenance amount, long service life and small environmental impact.

[0036] Gas Insulated Switchgear combines the primary equipment in the substation except the transformer, such as circuit breaker, disconnector, grounding switch, voltage transformer, current transformer, surge arrester, bus, cable terminal, incoming / outgoing line bushing, etc. into an organic whole through optimized design. The basic structure of GIS is to enclose high-voltage electrical appliances and insulation parts in a metal cylinder filled with SF6 gas at a certain pressure.

[0037] The on-site AC withstand voltage test of 1100kV GIL in a certain comprehensive pipe gallery project adopts the whole-section pressurization method. The test adopts the variable frequency series / parallel resonance principle, and the experimental system includes: 380V power frequency power supply, excitation transformer, variable frequency control cabinet, ultra-high voltage GIL integrated withstand voltage system, test object, peak voltage meter. The test wiring is as follows Figure 2During the test, first use a 5000V insulation resistance meter to measure the insulation resistance of each phase conductor to ground, which should be greater than 2GΩ; then operate the withstand voltage system according to the pressurization procedure, adjust the system frequency, and make the system reach the resonant state (the test frequency is controlled within the range of 50-300Hz, and the voltage is required to be increased slowly and uniformly. When the test voltage reaches 75%Uf, increase the voltage uniformly at a rate of (2%±1%)Uf per second). Increase the system voltage to 200kV and maintain it for 20 minutes; continue to increase the voltage to 300kV and maintain it for 20 minutes; continue to increase the voltage to 450kV and maintain it for 10 minutes; continue to increase the voltage to 664kV and maintain it for 10 minutes; continue to increase the voltage to 797kV and maintain it for 5 minutes; continue to increase the voltage to 900kV and maintain it for 1 minute; continue to increase the voltage to 1150kV and maintain it for 1 minute.

[0038] In ultra-high / ultra-high voltage converter stations, GIS / GIL, DC wall bushings, and other components are typically installed at heights (typically 5 to 10 meters above ground level), while conventional step-up equipment is only 1 to 3 meters high. For example, a 200 kV rated reactor stands 2.2 meters tall and weighs 4 tons. This height difference requires test leads to be tilted at a large angle, making it difficult to maintain the required safe distance between the lead tip and the surrounding grounding bodies.

[0039] To address the significant height difference between the booster equipment used for GIS / GIL AC withstand voltage testing and the GIS / GIL equipment, existing engineering practices often use spacers or temporary supports to raise the reactor from the ground. However, this presents the following problems:

[0040] 1. The height of the pad is fixed, and the height of the top of the boost reactor from the ground cannot be flexibly adjusted according to the height of the tested GIS / GIL equipment;

[0041] 2. The temporary support has poor stability, and the boost reactor is prone to displacement due to vibration during high-voltage testing, posing a safety hazard;

[0042] 3. Installation and disassembly are inconvenient, affecting the test efficiency of GIS / GIL equipment.

[0043] To address the issue of insufficient safety distance during GIB / GIL AC withstand voltage tests due to height mismatches between the GIS / GIL device under test and the booster, this invention proposes a booster height-raising device for GIS / GIL AC withstand voltage tests. This device, installed above the booster, features adjustable height and a secure installation. It conveniently and quickly aligns the booster reactor with the GIS / GIL device under test, increasing the safety distance between the high-voltage lead and the equipment below, thereby enhancing test safety.

[0044] like Figure 1 As shown, the booster device for increasing the height of GIS / GIL AC withstand voltage test according to the embodiment of the present invention includes:

[0045] a base body 10, configured to be arranged above the step-up reactor 40, and configured to be matched with the high-voltage interface (such as the high-voltage lead 60) of the GIS / GIL device 50 (passing through the wall 70) to be tested, such as a mounting slot;

[0046] a height adjusting mechanism 20, arranged between the bottom end of the base body 10 and the top end of the step-up reactor 40, and configured to adjust the vertical height of the top end of the base body 10 from the ground;

[0047] a support assembly 30, configured to connect the bottom end of the base body with the top end of the step-up reactor 40, and prevent the base body from shaking during the test.

[0048] In some embodiments, the base body 10 is extruded or injection molded by using an insulating, high-strength, lightweight material (such as epoxy resin), and the upper surface is provided with a mounting slot matched with the high-voltage interface of the GIS / GIL device 50 to be tested, and the lower surface is connected with the height adjusting mechanism 20 through a set of insulating bolts.

[0049] Specifically, the high-voltage insulating bolt is continuously drawn and extruded by mixing aramid fiber and glass fiber, and the product has excellent mechanical pressure resistance and mechanical tension resistance, with a tensile strength of 1500 MPa, far exceeding the tensile strength of 570 Mpa of No. 45 precision cast steel. The product has excellent electrical performance, with a voltage range of 10 kV to 1000 kV; strong corrosion resistance, high bending strength, not easy to bend, and convenient to use. The high-voltage insulating bolt allows a long-term working temperature of 170-210℃; the maximum short-circuit working temperature is 260℃ (time less than 5 seconds). The surface of the high-voltage insulating bolt product is very smooth without color difference, burr or scratch. The heat resistance and insulation level of the high-voltage insulating bolt product both reach H level.

[0050] In some embodiments, the upper surface of the base body 10 is covered with an epoxy resin-based composite insulating plate (voltage resistance ≥800 kV), and a silicon rubber skirt is installed on the side wall to suppress surface discharge. The edge of the composite insulating plate extends to the outside of the side wall by 50 mm to block the creeping path.

[0051] In some embodiments, the height adjusting mechanism 20 adopts a threaded lifting structure, including a threaded rod extending in the vertical direction and a threaded sleeve sleeved outside the threaded rod; the bottom end of the threaded rod is fixed to the top end of the reactor 40, and the top end of the threaded sleeve is connected with the base body 10 through a set of bolts; by rotating the threaded sleeve, the top end of the threaded sleeve is raised to adjust the vertical height of the top end of the base body from the ground. Rotating the threaded sleeve downward reduces the vertical height, and rotating the threaded sleeve upward increases the vertical height. Stopping rotation at any position, the threaded sleeve can be reliably maintained at the vertical height and will not move or slide.

[0052] Specifically, the screw lifting structure adopts right-handed lifting and left-handed lowering, adopts an inclined square thread, is suitable for single direction transmission, and the pitch of the screw rod is adaptively selected according to the nominal diameter of the thread: the lifting range is 2-5 m.

[0053] In this way, the height adjusting mechanism is easy to operate, the height adjustment can be quickly completed, and the test efficiency is improved.

[0054] In some embodiments, the bolt set includes several high-voltage insulating bolts, such as the flange connected to the top end of the threaded sleeve through the fixing hole in the lower surface of the base body, and cooperates with the lock nut to ensure stable connection.

[0055] In some embodiments, the bolt set includes several high-voltage insulating bolts, such as the flange connected to the top end of the reactor 40 through the fixing hole in the bottom end of the threaded rod, and cooperates with the lock nut to ensure stable connection.

[0056] In some embodiments, the support assembly includes several groups of telescopic guide columns. The telescopic guide columns are respectively and insulatively connected to the bottom end of the base body 10 and the top end of the step-up reactor 40. In this way, the support assembly enhances the rigidity of the heightening device in the vertical direction, can ensure that the base body is stable and reliable during the test, and avoids lateral deviation caused by vibration.

[0057] In this way, when the GIS / GIL AC voltage withstand test step-up equipment test is performed by using the heightening device, the height of the overall structure of the reactor is matched with the tested GIS / GIL equipment through the height-adjustable base body, and then the high-voltage lead can be arranged horizontally, so that the safety distance of the high-voltage lead from the surrounding structure, equipment, and building is improved to meet the specification requirements.

[0058] In some embodiments, the height adjusting mechanism 20 adopts a hydraulic scissors prop. Specifically, at least two rows of scissors forks are provided to provide vertical rigidity and structural support. A multi-stage scissors prop is selected to provide a larger stroke, and an additional guide column is provided to support the motion stability of the scissors prop. The bottom end of the scissors prop is fixed to the top end of the reactor 40, and the top end of the scissors prop is connected to the base body 10 through the bolt set. The scissors prop is unfolded through hydraulic control, the base body 10 is lifted, and the vertical height of the top end of the base body from the ground is adjusted. Specifically, the scissors prop is made of steel structure. In order to increase the stability at a certain position, a locking mechanism can be provided at some specific positions. The setting of the locking mechanism can also eliminate the sinking caused by the internal leakage of the hydraulic system. The locking mechanism is driven by hydraulic power, and the power source comes from the hydraulic system of the scissors prop.

[0059] Specifically, in the hydraulic system, the hydraulic pump station provides power for the hydraulic cylinder through the oil supply pipeline. Usually, a hand pump or a small power electric driven hydraulic pump is configured for the hydraulic pump station.

[0060] Specifically, when the base body 10 is lifted, the running speed or position of the scissors support is not directly detected, but the running speed is calculated through software by reading the position sensor data inside the hydraulic cylinder. The calculated running speed is fed back to the hydraulic control system, and the speed control is realized by adjusting the flow of the hydraulic cylinder oil supply pipeline, which will not be described here.

[0061] In this way, the height adjusting mechanism is easy to operate, and the height adjustment can be quickly completed, thereby improving the test efficiency.

[0062] In some embodiments, the height adjusting mechanism 20 adopts a multi-stage telescopic hydraulic cylinder, such as a 4-stage series connection. The cylinder barrel of the hydraulic cylinder is fixedly connected to the top end of the reactor 40, and the top end of the extending rod of the hydraulic cylinder is connected to the base body 10 through a bolt set. By controlling the hydraulic cylinder to extend step by step, the base body 10 is lifted, and the vertical height of the top end of the base body from the ground is adjusted. In this way, the height adjusting mechanism is easy to operate, and the height adjustment can be quickly completed, thereby improving the test efficiency.

[0063] In some embodiments, the height adjusting mechanism 20 adopts a step motor to drive at least one group of ball screws. Specifically, the ball screw is also provided with a guide rod. The bottom end of the screw is fixedly connected to the top end of the reactor 40, and the top end of the screw is connected to the base body 10 through a bolt set. By controlling the screw to extend, the base body 10 is lifted, and the vertical height of the top end of the base body from the ground is adjusted. In this way, the height adjusting mechanism is easy to operate, and the height adjustment can be quickly completed, thereby improving the test efficiency.

[0064] When the voltage boosting device heightening device for GIS / GIL AC withstand voltage test is used to perform GIS / GIL AC withstand voltage test, the heightening device is placed above the voltage boosting device, and the heightening device is quickly lifted to a height matched with the GIS / GIL device and reliably maintained at the height.

[0065] The voltage boosting device heightening device for GIS / GIL AC withstand voltage test provided by the application solves the problem of mismatch between the height of the reactor and the GIS / GIL device to be tested through the height-adjustable base design. The combination of the support assembly and the insulating base takes into account the structural stability and electrical safety. The height adjusting mechanism can be flexibly adapted to GIS / GIL devices of different heights, and has strong universality.

[0066] The voltage boosting device heightening device for GIS / GIL AC withstand voltage test improves the safety of the test, greatly improves the verticality of the lead wire and greatly reduces the probability of tip discharge due to the insulating base body. The test efficiency is improved, and the time for building a test loop is greatly shortened. Single-station withstand voltage test can be performed, which can significantly save the cost of a crane and save test costs.

[0067] In the description of the present application, it is to be understood that the aforementioned cooperation, centering or fitting, respectively, has the fitting accuracy, dimensional tolerance, shape error, profile error and / or form error, etc. known to those skilled in the art, which will not be described herein.

[0068] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0069] In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified and limited.

[0070] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected (such as welding, bonding, thread, screw, pin, rivet, etc. fixed), or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0072] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

[0074] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0075] The above description is only illustrative, not limiting, and those skilled in the art understand that many modifications, changes or equivalents can be made without departing from the spirit and scope of the claims, but all will fall within the protection scope of the present application.

Claims

1. A booster device for GIS / GIL AC withstand voltage test, characterized in that: include: Base body, support assembly, height adjustment mechanism; The base body is used to be arranged above the height adjustment mechanism, and is provided with a mounting interface that matches the high-voltage interface of the tested GIS / GIL device; The height adjustment mechanism is provided between the bottom end of the base body and the top end of the boost reactor, and is used to adjust the vertical height of the top end of the base body from the ground; The support assembly is used to connect the bottom end of the base body to the top end of the boost reactor to prevent the base body from shaking.

2. The booster device for GIS / GIL AC withstand voltage test according to claim 1, characterized in that: The base body is molded with epoxy resin, and its upper surface is provided with a mounting groove matching the high-voltage interface of the tested GIS / GIL equipment, and the lower surface is connected to the height adjustment mechanism through an insulating bolt group.

3. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 2, characterized in that: The insulating bolt group includes high-voltage insulating bolts; The tensile strength of the high-voltage insulating bolt reaches 1500MPa, the withstand voltage range is 10kV to 1000kV, and the long-term working temperature is 170-210°C.

4. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 2, characterized in that: The upper surface of the base body is covered with an epoxy resin-based composite insulation board, and the edge of the composite insulation board extends to more than 50 mm outside the side wall; the side wall is additionally provided with a silicone rubber skirt.

5. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 1, characterized in that: The height adjustment mechanism adopts a threaded lifting structure, including a threaded rod extending in the vertical direction and a threaded sleeve sleeved outside the threaded rod; the bottom end of the threaded rod is fixed to the top of the reactor, and the top of the threaded sleeve is connected to the base body by a bolt group. By rotating the threaded sleeve, the top end is raised to adjust the vertical height of the top end of the base body from the ground.

6. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 5, characterized in that: The bolt group includes a plurality of high-voltage insulating bolts, which pass through the fixing holes on the lower surface of the base body and are connected to the flange provided on the top of the threaded sleeve, and cooperate with the anti-loosening nut to ensure the connection is stable; The high-voltage insulating bolt passes through the flange provided at the bottom end of the threaded rod and is connected to the fixing hole at the top end of the reactor, and is matched with a locking nut to ensure a firm connection.

7. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 1, characterized in that: The support assembly includes a plurality of groups of telescopic guide columns; the telescopic guide columns are respectively connected to the bottom end of the base body and the top end of the boost reactor in an insulated manner.

8. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 1, characterized in that: The height adjustment mechanism adopts a hydraulic scissors support; the hydraulic scissors support is provided with at least two rows of scissors forks; the bottom end of the scissors support is fixed to the top of the reactor, and the top end of the scissors support is connected to the base body through a bolt group. When the scissors support is unfolded by hydraulic control, the base body rises.

9. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 1, characterized in that: The height adjustment mechanism adopts a multi-stage telescopic hydraulic cylinder; the cylinder barrel of the hydraulic cylinder is fixedly connected to the top of the reactor, and the top of the extension rod of the hydraulic cylinder is connected to the base body through a bolt group; through hydraulic control, the hydraulic cylinder is extended step by step, and the base body rises.

10. The booster device for increasing the height of GIS / GIL AC withstand voltage test according to claim 1, characterized in that: The height adjustment mechanism uses a stepper motor to drive at least one set of ball screws; The ball screw is provided with a guide rod; The bottom end of the lead screw is fixedly connected to the top end of the reactor, and the top end of the lead screw is connected to the base body through a bolt group; The motor controls the lead screw to extend, and the base body rises.

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