Closed grounding switch for extra-high voltage equipment

Abstract

The invention relates to the technical field of high-voltage equipment, and provides a closed grounding switch for extra-high-voltage equipment. The closed grounding switch comprises a closed transmission device and at least one section of switch unit, and is characterized in that the switch unit comprises an insulating outer cylinder and a multi-fracture structure arranged in the insulating outercylinder, the multi-fracture structure comprises a fixed insulating plate and a movable insulating plate which are arranged in parallel, the fixed insulating plate is fixedly connected with the insulating outer cylinder, a guide block and a fixed copper head are arranged on the fixed insulating plate, one end of the movable insulating plate is movably connected with the closed transmission device, a plurality of guide shafts and a plurality of movable copper heads are arranged on the movable insulating plate, and each fixed copper head and each movable copper head are arranged in a one-to-onecorrespondence mode; a guide groove is formed in the guide block, the tangent line of the guide groove and the fixed insulating plate form an angle alpha, alpha is greater than 0 degree and less than45 degrees, and the guide shaft is arranged in the guide groove and slides along the guide groove. According to the invention, the multi-fracture structure is adopted, the original high voltage is shared to each fracture, the fracture voltage is correspondingly reduced, and the insulation cylinder is designed to be an enclosed structure, so that the environmental influence is small.

Description

technical field [0001] The invention relates to the technical field of high-voltage equipment, in particular to an enclosed grounding switch for UHV equipment. Background technique [0002] The original UHV DC device used for UHV equipment closed grounding switch mostly adopts exposed or cylindrical type for UHV equipment closed grounding switch, and the above closed grounding switches used for UHV equipment are all exposed to the air, especially in UHV tests such as converter valve tests with high requirements require very stringent partial discharge requirements, the minimum partial discharge requirement is less than 300pC, and the enclosed grounding switches used for UHV equipment are often affected by air quality during the test process. For example, when the air humidity is high, when the air contains heavy dust, the inside of the closed grounding switch used for UHV equipment will be damp or the switch plate will absorb dust, and partial discharge will occur under high...

AI Technical Summary

Problems solved by technology

[0002] The original UHV DC device used for UHV equipment closed grounding switch mostly adopts exposed or cylindrical type for UHV equipment closed grounding switch, and the above closed grounding switches used for UHV equipment are all exposed to the air, especially in UHV tests such as converter valve tests with high requirements require very stringent partial discharge requirements, the minimum partial discharge requirement is less than 300pC, and the enclosed grounding switches used for UHV equipment are often affected by air quality during the test process. For example, when the air humidity is high, when the air contains heavy dust, the inside of the closed grounding switch used for UHV equipment will be damp or the switch plate will absorb dust, and partial discharge will occur under high voltage. As a result, the partial discharge of the entire DC device increases, forcing the test of the converter valve to be terminated

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