A closed grounding switch for UHV equipment

Abstract

The present invention relates to the technical field of high-voltage equipment, and provides a closed grounding switch for ultra-high voltage equipment, comprising a closing transmission device and at least one switch unit, wherein the switch unit comprises an insulating outer cylinder and a multi-break structure arranged in the insulating outer cylinder, wherein the multi-break structure comprises a fixed insulating plate and a movable insulating plate arranged in parallel with each other, wherein the fixed insulating plate is fixedly connected to the insulating outer cylinder and a guide block and a fixed copper head are arranged on the fixed insulating plate, wherein one end of the movable insulating plate is movably connected to the closing transmission device, and a plurality of guide shafts and a plurality of movable copper heads are arranged on the movable insulating plate, wherein each fixed copper head and each movable copper head are arranged in a one-to-one correspondence; a guide groove is arranged on the guide block, wherein the tangent of the guide groove is arranged at an angle α with the fixed insulating plate, wherein 0°<α<45°, and the guide shaft is arranged in the guide groove and slides along the guide groove; the present invention adopts a multi-break structure, wherein the original high voltage is distributed to each break, and the break voltage is correspondingly reduced; and meanwhile, the insulating cylinder is designed as a closed structure, so that it is less affected by the environment.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage equipment, and more particularly, to a closed earthing switch for ultra-high voltage equipment. Background Art

[0002] The original closed earthing switches for ultra-high voltage equipment in ultra-high voltage DC devices mostly adopt exposed or cylindrical structures. The above-mentioned closed earthing switches for ultra-high voltage equipment are all exposed to the air. Especially during ultra-high voltage tests, such as in the converter valve tests with high requirements, the partial discharge requirements are quite strict, with the minimum partial discharge requirement being less than 300 pC. However, the above-mentioned closed earthing switches for ultra-high voltage equipment are often inevitably 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 interior of the closed earthing switch for ultra-high voltage equipment will get damp or the switch plates will adsorb dust, resulting in partial discharge under high voltage, which in turn causes the increase of the partial discharge amount of the entire DC device and forces the termination of tests such as converter valves. Summary of the Invention

[0003] The purpose of the present invention is to provide a closed earthing switch for ultra-high voltage equipment, which adopts a multi-break structure, and the original high voltage is distributed to each break, so that the break voltage is relatively reduced, and thus it is less affected by the environment.

[0004] The embodiments of the present invention are realized through the following technical solutions: A closed earthing switch for ultra-high voltage equipment includes a closing drive device and at least one switch unit. The switch unit includes an insulating outer cylinder and a multi-break structure arranged inside the insulating outer cylinder. The multi-break structure includes a fixed insulating plate and a movable insulating plate arranged in parallel. The fixed insulating plate is fixedly connected to the insulating outer cylinder, and several guide blocks and several fixed copper heads are provided on the fixed insulating plate. One end of the movable insulating plate is movably connected to the closing drive device, and several guide shafts and several movable copper heads are provided on the movable insulating plate. Each fixed copper head and each movable copper head are arranged in one-to-one correspondence; a guide groove is provided on the guide block, and the tangent of the guide groove is set at an angle α with the fixed insulating plate, where 0° < α < 45°, and the guide shaft is arranged in the guide groove and slides along the guide groove.

[0005] Furthermore, a voltage-sharing resistor is connected in parallel between two adjacent fixed copper heads.

[0006] Furthermore, the end face of the fixed copper head is a plane, and the end face of the movable copper head is circular. When the closing drive device is closed, the end face of the fixed copper head contacts the end face of the movable copper head.

[0007] Furthermore, a push-pull connection block is provided between the movable insulating plate and the closing drive device. One end of the push-pull connection block is hinged to the movable insulating plate, and the other end of the push-pull connection block is hinged to the movable end of the closing drive device.

[0008] Further, an intake valve and an exhaust valve are also provided on the insulating outer cylinder.

[0009] Further, the closing transmission device includes a cylinder and a hydraulic cylinder.

[0010] Further, a switch upper support cylinder is provided at the top of the enclosed earthing switch for extra-high voltage equipment, and a switch lower support cylinder is provided at the bottom of the enclosed earthing switch for extra-high voltage equipment.

[0011] Further, the switch upper support cylinders and the switch lower support cylinders of adjacent switch units are detachably connected.

[0012] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0013] 1. The enclosed earthing switch for extra-high voltage equipment adopts a multi-break structure, and the original high voltage is distributed to each break, so that the break voltage is relatively reduced; at the same time, equalizing resistors are connected in parallel to each break, thus ensuring the consistency of the voltage of each break and avoiding flashover caused by too high voltage of a certain break.

[0014] 2. The enclosed earthing switch for extra-high voltage equipment is filled with insulating gas inside, which can effectively isolate the external air and prevent the external air from entering the enclosed earthing switch for extra-high voltage equipment, causing the reduction of the internal insulation of the switch or the generation of partial discharge.

[0015] 3. The enclosed earthing switch for extra-high voltage equipment is designed with an inflation valve at the lower part and a ventilation valve at the top. When the insulating gas inside the enclosed earthing switch for extra-high voltage equipment needs to be replaced, only the gas source needs to be connected to the quick connector at the bottom of the switch, and the inflation valve will automatically open for inflation, and the ventilation valve at the top will automatically exhaust (the pressure value has been set, and it will automatically exhaust when it is greater than this value). After the ventilation is completed, only the inflation valve needs to be stopped from supplying gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 FIG. is a schematic structural diagram of an enclosed earthing switch for extra-high voltage equipment provided by the present invention;

[0018] Figure 2 is Figure 1 the enlarged view of A in

[0019] Figure 3Schematic installation diagram of the switch upper support cylinder in the enclosed earthing switch for UHV equipment provided by the present invention;

[0020] Figure 4 Schematic connection diagram of the enclosed earthing switch for UHV equipment provided by the present invention;

[0021] Figure 5 Schematic structure diagram of the guiding groove in the enclosed earthing switch for UHV equipment provided by the present invention Figure 1 ;

[0022] Figure 6 Schematic structure diagram of the guiding groove in the enclosed earthing switch for UHV equipment provided by the present invention Figure 2 ;

[0023] Figure 7 Schematic connection diagram of the tee pipe in the enclosed earthing switch for UHV equipment provided by the present invention;

[0024] Icon: 10 - closing drive device, 11 - switch upper support cylinder, 12 - switch lower support cylinder, 20 - switch unit, 21 - insulating outer cylinder, 22 - multi-break structure, 23 - fixed insulating plate, 24 - movable insulating plate, 231 - fixed copper head, 232 - guiding block, 233 - guiding groove, 241 - movable copper head, 242 - guiding shaft, 30 - push-pull connection block, 40 - grading resistor. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that: similar reference numerals and letters denote 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.

[0028] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, 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. Therefore, it should not be construed as a limitation to the present invention.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, if terms such as "set", "installed", "connected", "coupled" are used, they 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 elements. 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 circumstances.

[0030] Embodiment

[0031] Such as Figure 1As shown in the figure, a closed earthing switch for UHV equipment includes a closing drive device 10 and a section of switch unit 20. The switch unit 20 includes an insulating outer cylinder 21 and a multi-break structure 22 arranged inside the insulating outer cylinder 21. The multi-break structure 22 includes a fixed insulating plate 23 and a movable insulating plate 24 arranged in parallel with each other. The fixed insulating plate 23 is fixedly connected to the insulating outer cylinder 21, and a number of guide blocks 232 and a number of fixed copper heads 231 are provided on the fixed insulating plate 23. One end of the movable insulating plate 24 is movably connected to the closing drive device 10. The closing drive device 10 uses a cylinder, and the cylinder is coaxially arranged with the insulating outer cylinder 21. A number of guide shafts 242 and a number of movable copper heads 241 are provided on the movable insulating plate 24. Each fixed copper head 231 and each movable copper head 241 are arranged in one-to-one correspondence. A guide groove 233 is provided on the guide block 232. The guide groove 233 is arranged at an angle to the fixed insulating plate 23. The guide shaft 242 is arranged in the guide groove 233 and slides along the guide groove 233. When the closing drive device 10 drives the movable insulating plate 24, since the movement of the guide shaft 242 is restricted by the guide groove 233, the movable insulating plate 24 will change its movement trajectory along with the restriction of the guide groove 233, resulting in the contact or non-contact between the movable copper head 241 and the fixed copper head 231. Specifically, in order to accommodate the trajectory error, the end face of the fixed copper head 231 is a plane, and the end face of the movable copper head 241 is circular. The point contact surface form is used to ensure that the movable copper head 241 can better contact the fixed copper head 231. Furthermore, the connection method between the closing drive device 10 and the movable insulating plate 24 is not limited, as long as it can ensure that the movable insulating plate 24 can move relative to the guide groove 233, such as: as Figure 2 As shown in the figure, a push-pull connection block 30 is provided between the movable insulating plate 24 and the closing drive device 10. One end of the push-pull connection block 30 is hinged to the movable insulating plate 24, and the other end of the push-pull connection block 30 is hinged to the movable end of the closing drive device 10. Of course, this setting is not the only one, and any connection method that meets the technical effect in the market can be adopted. Through the design of multiple fixed contacts and movable contacts, the original high voltage is shared among each break, and the break voltage is reduced accordingly, thus avoiding partial discharge under high voltage environment.

[0032] It should be emphasized that, as Figures 5-6 shown in the figure, the shape of the guide groove 233 is not limited, and it can be linear, curved, or broken line-shaped, as long as it can meet the purpose of restricting the movable insulating plate 24 to contact or move away from the fixed insulating plate 23 when the closing drive device 10 moves.

[0033] In some embodiments, in order to further ensure that the voltage of each break is relatively stable, a voltage-sharing resistor 40 is connected in parallel between two adjacent fixed copper heads 231, thus ensuring the consistency of the voltages of each break and avoiding flashover caused by too high voltage of a certain break.

[0034] In some embodiments, in order to further avoid the influence of dust and humidity in the air, an intake valve and an exhaust valve are also provided on the insulating outer cylinder 21. By filling the insulating outer cylinder 21 with insulating gas, of course, the insulating outer cylinder 21 should be closed at this time; when the insulating gas inside the closed-type grounding switch for ultra-high voltage equipment needs to be replaced, only connect the gas source to the intake valve at the bottom of the switch, and the inflation valve will automatically open for inflation, and the exhaust valve at the top will automatically exhaust (the pressure value has been set, and it will automatically exhaust when it is greater than this value). After the air replacement is completed, just remove the gas source.

[0035] It should also be noted that in some embodiments, since the volume of the distributor equipment of the DC high-voltage generator is relatively large, a relatively large closed-type grounding switch for ultra-high voltage equipment is required. Therefore, in some embodiments, the closed-type grounding switch for ultra-high voltage equipment is multi-section, which is convenient for transportation and assembly. Specifically, as Figure 4 shown, the top of the insulating outer cylinder 21 of the switch unit 20 is detachably connected to the closing drive device 10. In order to ensure the protection of the closed-type grounding switch for ultra-high voltage equipment, a switch upper support cylinder 11 is provided at the top of the closed-type grounding switch for ultra-high voltage equipment to protect the closing drive device 10, and a switch lower support cylinder 12 is provided at the bottom of the closed-type grounding switch for ultra-high voltage equipment. The switch upper support cylinder 11 and the switch lower support cylinder 12 of adjacent closed-type grounding switches for ultra-high voltage equipment are detachably connected. It should be noted that the detachable connection method is not fixed, and it can be adopted by means of screws, buckles, flanges or interference fits, depending on the specific situation.

[0036] Each section of the closed-type grounding switch for ultra-high voltage equipment is driven to act by its own closing drive device 10. In addition, it should also be noted that in some embodiments, inert gas is needed to protect electrical components for convenient unified management. Using one gas source, the intake valves and exhaust valves in adjacent closed-type grounding switches for ultra-high voltage equipment are connected to each other or connected by means of a tee pipe. Regarding the number of intake valves and exhaust valves, it depends on the actual scenario and will not be limited here. For example: at the connection of the closed-type grounding switches for ultra-high voltage equipment, a tee pipe is used to connect the intake valves of different closed-type grounding switches for ultra-high voltage equipment, and one gas source can be used to supply gas to two closed-type grounding switches for ultra-high voltage equipment at the same time.

[0037] In addition, in some embodiments, the movable insulating plates in adjacent closed-type grounding switches for ultra-high voltage equipment can be connected to each other and driven by one closing drive device.

[0038] Finally, it should be noted that in this embodiment, the electrical connection method in the closed-type grounding switch for ultra-high voltage equipment is well-known to those skilled in the art and will not be elaborated here.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A closed earthing switch for UHV equipment, characterized in that: It includes at least one closed transmission device and at least one section of switch unit. The switch unit includes an insulating outer cylinder and a multi-break structure arranged inside the insulating outer cylinder. The multi-break structure includes a fixed insulating plate and a movable insulating plate arranged in parallel with each other. The fixed insulating plate is fixedly connected to the insulating outer cylinder, and a number of guide blocks and a number of fixed copper heads are provided on the fixed insulating plate. One end of the movable insulating plate is movably connected to the closed transmission device, and a number of guide shafts and a number of movable copper heads are provided on the movable insulating plate. Each of the fixed copper heads and each of the movable copper heads are arranged in one-to-one correspondence; a guide groove is provided on the guide block, and the tangent of the guide groove is arranged at an angle α with the fixed insulating plate, 0° < α < 45°, and the guide shaft is arranged in the guide groove and slides along the guide groove; The end face of the fixed copper head is a plane, and the end face of the movable copper head is circular. When the closed transmission device is closed, the end face of the fixed copper head contacts the end face of the movable copper head.

2. The enclosed earthing switch for UHV equipment according to claim 1, characterized in that A voltage-sharing resistor is connected in parallel between every two of the fixed copper heads.

3. The enclosed earthing switch for UHV equipment according to claim 1, characterized in that, A push-pull connection block is provided between the movable insulating plate and the closed transmission device. One end of the push-pull connection block is hinged to the movable insulating plate, and the other end of the push-pull connection block is hinged to the movable end of the closed transmission device.

4. The enclosed earthing switch for UHV equipment according to claim 3, wherein, An intake valve and an exhaust valve are further provided on the insulating outer cylinder.

5. The enclosed earthing switch for UHV equipment according to claim 4, characterized in that, The closed transmission device includes a cylinder and a hydraulic cylinder.

6. The enclosed earthing switch for UHV equipment according to any one of claims 1-5, characterized in that, A switch upper support cylinder is provided at the top of the enclosed earthing switch for extra-high voltage equipment, and a switch lower support cylinder is provided at the bottom of the enclosed earthing switch for extra-high voltage equipment.

7. The enclosed earthing switch for UHV equipment according to claim 6, characterized in that, It includes a plurality of enclosed earthing switches for extra-high voltage equipment. Each of the enclosed earthing switches for extra-high voltage equipment is provided with a transmission device and one section of switch unit. The switch upper support cylinders and the switch lower support cylinders of adjacent enclosed earthing switches for extra-high voltage equipment are detachably connected.

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