An extra-high voltage earthing switch

Abstract

The present invention discloses an extra-high voltage earthing switch, belonging to the technical field of high-voltage equipment, aiming to solve the problem of excessive partial discharge of the existing earthing switch due to structural defects. Oil is filled in the insulating sleeve of each earthing switch unit, which can effectively isolate the external air, prevent the external air from entering the interior of the earthing switch unit, improve the internal insulation strength of the earthing switch unit, control the partial discharge amount, and at the same time protect the earthing switch unit from being affected by moisture. A grading resistor is also connected in parallel between adjacent fixed support plates to ensure the consistency of the voltage between the plate assemblies and prevent the generation of voltage difference. When the moving plate and the fixed plate of the plate assembly are in contact, it is surface-to-surface contact to increase the contact area and prevent the generation of cavity discharge. The start and stop of the earthing switch unit are realized by driving the push rod through the closing drive device, the action time is shortened, and the efficiency is greatly improved while ensuring safety. The present invention is applicable to extra-high voltage earthing switches.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage equipment, and particularly relates to an extra-high voltage earthing switch. Background Art

[0002] Most of the earthing switches of existing high-voltage test equipment adopt an exposed or cylindrical structure, and the earthing switches are all exposed to the air. Especially during extra-high voltage tests such as converter valve tests with high requirements, the partial discharge requirements are quite strict, and the minimum partial discharge requirement is less than 300 pC. However, the earthing switches with the above structures are often affected by air quality during the test. For example, when the air humidity is high or when the dust in the air is heavy, the inside of the earthing switch will get damp or the switch plates will adsorb dust, resulting in partial discharge under high voltage, which in turn causes the partial discharge of the entire device to increase, forcing the termination of tests such as converter valves. Summary of the Invention

[0003] The purpose of the present invention is to provide an extra-high voltage earthing switch to solve the problem of excessive partial discharge of the existing earthing switch due to structural defects.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An extra-high voltage earthing switch includes an earthing switch metal pillar and an earthing switch upper pillar. A plurality of linearly connected earthing switch units are arranged between the earthing switch metal pillar and the earthing switch upper pillar. Each earthing switch unit includes an insulating sleeve, an upper flange is arranged at the upper end of the insulating sleeve, a lower flange is arranged at the lower end of the insulating sleeve, and the upper flange and the lower flange of adjacent earthing switch units are connected by bolts. The upper end of the earthing switch metal pillar is bolted to the lower flange of the lowermost earthing switch unit, and the lower end of the earthing switch upper pillar is bolted to the upper flange of the uppermost earthing switch unit. A closing transmission device is installed on the contact surface between the earthing switch metal pillar and the lower flange of the earthing switch unit. The output end of the closing transmission device is connected with a push-pull rod. An oil inlet pipe is communicated with the earthing switch upper pillar, and an oil outlet pipe is communicated with the earthing switch metal pillar. The insulating sleeve of the earthing switch unit is filled with oil;

[0006] A support seat is also installed on the lower flange, a support assembly is installed below the upper flange, a wire is connected between the support assembly and the upper flange, and a plurality of plate assemblies are installed at intervals between the lower part of the support assembly and the top of the support seat. The plate assembly includes a movable plate, a fixed plate, and a fixed support plate arranged in sequence from top to bottom. The fixed plate is installed on the upper surface of the fixed support plate, the movable plate is connected to the lower surface of the fixed support plate of the adjacent plate assembly above through a spring, the movable plate of the uppermost plate assembly is connected to the lower surface of the support assembly through a spring, the fixed support plate of the lowermost plate assembly is connected to the top of the support seat, and the movable plate of each earthing switch unit is coaxially connected to the push rod.

[0007] Further, grading resistors are also connected in parallel between adjacent fixed support plates.

[0008] Further, when the closing transmission device drives the push rod to close the movable plate and the fixed plate, the end face of the movable plate contacts the end face of the fixed plate.

[0009] Further, the closing transmission device is a cylinder or a hydraulic cylinder.

[0010] Further, an oil-resistant sealing gasket is installed at the connection between the upper flange and the lower flange.

[0011] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0012] 1. In the present invention, oil is filled in the insulating sleeve of each earthing switch unit, which can effectively isolate external air, prevent external air from entering the interior of the earthing switch unit, improve the internal insulation strength of the earthing switch unit, control the partial discharge amount, and also protect the earthing switch unit from moisture.

[0013] 2. In the present invention, grading resistors are also connected in parallel between adjacent fixed support plates to ensure the consistency of the voltage between the plate assemblies and prevent the generation of voltage differences.

[0014] 3. In the present invention, when the movable plate and the fixed plate of the plate assembly are in contact, it is a surface-to-surface contact to increase the contact area and prevent the generation of cavity discharge.

[0015] 4. In the present invention, the start and stop of the earthing switch unit are realized by driving the push rod through the closing transmission device, the action time is shortened, the efficiency is greatly improved, and the safety is ensured at the same time. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings, where:

[0017] Figure 1 is the structural schematic diagram of the present invention;

[0018] Figure 2 is the enlarged structural diagram of local A of the present invention;

[0019] Figure 3 is the enlarged structural diagram of local B of the present invention;

[0020] Figure 4 is the enlarged structural diagram of local C of the present invention;

[0021] Markings in the figure: 1 - grounding switch metal pillar, 11 - closing drive device, 12 - push-pull rod, 13 - oil outlet pipe, 2 - upper pillar of grounding switch, 21 - oil inlet pipe, 3 - grounding switch unit, 31 - insulating sleeve, 32 - upper flange, 33 - lower flange, 34 - support seat, 35 - support assembly, 36 - wire, 37 - movable electrode plate, 38 - fixed electrode plate, 39 - fixed support plate, 310 - spring, 311 - voltage-sharing resistor. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0024] It should be noted that: reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed during use. It is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] A super-high voltage earthing switch includes an earthing switch metal pillar and an earthing switch upper pillar. A plurality of linearly connected earthing switch units are arranged between the earthing switch metal pillar and the earthing switch upper pillar. The earthing switch unit includes an insulating sleeve. An upper flange is arranged at the upper end of the insulating sleeve, and a lower flange is arranged at the lower end of the insulating sleeve. The upper flange and the lower flange of adjacent earthing switch units are connected by bolts. The upper end of the earthing switch metal pillar is bolted to the lower flange of the lowermost earthing switch unit. The lower end of the earthing switch upper pillar is bolted to the upper flange of the uppermost earthing switch unit. A closing transmission device is installed on the contact surface between the earthing switch metal pillar and the lower flange of the earthing switch unit. The output end of the closing transmission device is connected with a push-pull rod. An oil inlet pipe is communicated with the earthing switch upper pillar, and an oil outlet pipe is communicated with the earthing switch metal pillar. The insulating sleeve of the earthing switch unit is filled with oil;

[0029] A support base is also installed on the lower flange, a support assembly is installed below the upper flange, a wire is connected between the support assembly and the upper flange, and a number of plate assemblies are installed at intervals between the lower part of the support assembly and the top of the support base. The plate assembly includes a movable plate, a fixed plate, and a fixed support plate arranged in sequence from top to bottom. The fixed plate is installed on the upper surface of the fixed support plate, the movable plate is connected to the lower surface of the fixed support plate of the adjacent plate assembly above through a spring, the movable plate of the uppermost plate assembly is connected to the lower surface of the support assembly through a spring, the fixed support plate of the lowermost plate assembly is connected to the top of the support base, and the movable plate of each earthing switch unit is coaxially connected to the push rod.

[0030] Further, equalizing resistors are also connected in parallel between adjacent fixed support plates.

[0031] Further, when the closing drive device drives the push rod to close the movable plate and the fixed plate, the end face of the movable plate contacts the end face of the fixed plate.

[0032] Further, the closing drive device is a cylinder or a hydraulic cylinder.

[0033] Further, an oil-resistant sealing gasket is installed at the connection between the upper flange and the lower flange.

[0034] In the implementation process of the present invention, each earthing switch unit is connected through the upper flange and the lower flange. The upper end of the earthing switch metal pillar is bolted to the lower flange of the lowermost earthing switch unit, and the lower end of the upper pillar of the earthing switch is bolted to the upper flange of the uppermost earthing switch unit. An oil inlet pipe is connected to the upper pillar of the earthing switch, and an oil outlet pipe is connected to the earthing switch metal pillar. By filling oil into the insulating sleeve of the earthing switch unit through the oil inlet pipe, external air can be effectively isolated, preventing external air from entering the interior of the earthing switch unit, improving the internal insulation strength of the earthing switch unit, controlling the partial discharge amount, and at the same time protecting the earthing switch unit from being affected by moisture. An oil-resistant sealing gasket is installed at the connection between the upper flange and the lower flange to ensure good sealing of the earthing switch unit. When the closing drive device drives the push rod to close the movable plate and the fixed plate, the end face of the movable plate contacts the end face of the fixed plate, increasing the contact area and preventing cavity discharge. At the same time, the start and stop of the earthing switch unit are realized by driving the push rod through the closing drive device, shortening the action time, greatly improving the efficiency and ensuring safety.

[0035] As a preferred embodiment, equalizing resistors are also connected in parallel between adjacent fixed support plates to ensure the consistency of the voltage between the plate assemblies and prevent voltage difference.

[0036] Embodiment 1

[0037] A super-high voltage earthing switch includes an earthing switch metal pillar and an earthing switch upper pillar. There are multiple earthing switch units linearly connected between the earthing switch metal pillar and the earthing switch upper pillar. The earthing switch unit includes an insulating sleeve. An upper flange is arranged at the upper end of the insulating sleeve, and a lower flange is arranged at the lower end of the insulating sleeve. The upper flange and the lower flange of adjacent earthing switch units are connected by bolts. The upper end of the earthing switch metal pillar is bolted to the lower flange of the lowermost earthing switch unit. The lower end of the earthing switch upper pillar is bolted to the upper flange of the uppermost earthing switch unit. A closing transmission device is installed on the contact surface between the earthing switch metal pillar and the lower flange of the earthing switch unit. The output end of the closing transmission device is connected with a push-pull rod. An oil inlet pipe is communicated with the earthing switch upper pillar, and an oil outlet pipe is communicated with the earthing switch metal pillar. The insulating sleeve of the earthing switch unit is filled with oil;

[0038] A support seat is also installed on the lower flange. A support component is installed below the upper flange. A wire is connected between the support component and the upper flange. A plurality of plate assemblies are installed at intervals between the lower part of the support component and the top of the support seat. The plate assembly includes a movable plate, a fixed plate, and a fixed support plate arranged in sequence from top to bottom. The fixed plate is installed on the upper surface of the fixed support plate. The movable plate is connected to the lower surface of the fixed support plate of the adjacent plate assembly above by a spring. The movable plate of the uppermost plate assembly is connected to the lower surface of the support component by a spring. The fixed support plate of the lowermost plate assembly is connected to the top of the support seat. The movable plate of each earthing switch unit is coaxially connected with the push-pull rod.

[0039] Embodiment 2

[0040] On the basis of Embodiment 1, equalizing resistors are also connected in parallel between adjacent fixed support plates.

[0041] Embodiment 3

[0042] On the basis of the above embodiments, when the closing transmission device drives the push-pull rod to close the movable plate and the fixed plate, the end face of the movable plate contacts the end face of the fixed plate.

[0043] Embodiment 4

[0044] On the basis of the above embodiments, the closing transmission device is a cylinder or a hydraulic cylinder.

[0045] Embodiment 5

[0046] On the basis of the above embodiments, an oil-resistant sealing gasket is installed at the connection between the upper flange and the lower flange.

[0047] The above is the embodiment of the present invention. The foregoing are the various preferred embodiments of the present invention. If the preferred implementation manners in the various preferred embodiments are not obviously self-contradictory or premised on a certain preferred implementation manner, the various preferred implementation manners can be arbitrarily superimposed and combined for use. The embodiments and the specific parameters in the embodiments are only for clearly expressing the verification process of the invention, and are not used to limit the patent protection scope of the present invention. The patent protection scope of the present invention still takes its claims as the criterion. All equivalent structural changes made by using the content of the specification and drawings of the present invention should similarly be included in the protection scope of the present invention.

Claims

1. A special high-voltage earthing switch, characterized in that, It includes a grounding switch metal pillar (1) and a grounding switch upper pillar (2). Between the grounding switch metal pillar (1) and the grounding switch upper pillar (2), there are multiple grounding switch units (3) connected linearly in series. The grounding switch unit (3) includes an insulating sleeve (31). At the upper end of the insulating sleeve (31), there is an upper flange (32), and at the lower end of the insulating sleeve (31), there is a lower flange (33). The upper flange (32) and the lower flange (33) of adjacent grounding switch units (3) are connected by bolts. The upper end of the grounding switch metal pillar (1) is bolted to the lower flange (33) of the lowermost grounding switch unit (3), and the lower end of the grounding switch upper pillar (2) is bolted to the upper flange (32) of the uppermost grounding switch unit (3). Inside the grounding switch metal pillar (1), a closing transmission device (11) is installed on the contact surface with the lower flange (33) of the grounding switch unit (3). The output end of the closing transmission device (11) is connected to a push-pull rod (12). An oil inlet pipe (21) is connected to the grounding switch upper pillar (2), and an oil outlet pipe (13) is connected to the grounding switch metal pillar (1). The insulating sleeve (31) of the grounding switch unit (3) is filled with oil; A support seat (34) is also installed on the lower flange (33). A support assembly (35) is installed below the upper flange (32). The support assembly (35) is connected to the upper flange (32) by a wire (36). Between the lower part of the support assembly (35) and the top of the support seat (34), several plate assemblies are installed at intervals. The plate assembly includes a movable plate (37), a fixed plate (38), and a fixed support plate (39) arranged in sequence from top to bottom. The fixed plate (38) is installed on the upper surface of the fixed support plate (39). The movable plate (37) is connected to the lower surface of the fixed support plate (39) of the adjacent plate assembly above by a spring (310). The movable plate (37) of the uppermost plate assembly is connected to the lower surface of the support assembly (35) by a spring (310). The fixed support plate (39) of the lowermost plate assembly is connected to the top of the support seat (34). The movable plate (37) of each grounding switch unit (3) is coaxially connected to the push-pull rod (12). A voltage-sharing resistor (311) is also connected in parallel between adjacent fixed support plates (39). When the closing transmission device (11) drives the push-pull rod (12) to close the movable plate (37) and the fixed plate (38), the end face of the movable plate (37) contacts the end face of the fixed plate (38).

2. The extra-high voltage earthing switch according to claim 1, characterized in that, The closing transmission device (11) is a cylinder or a hydraulic cylinder.

3. A super high voltage earthing switch according to claim 1, characterized in that, An oil-resistant sealing gasket is installed at the connection between the upper flange (32) and the lower flange (33).

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