A direct-acting three-position isolating switch and gas-insulated switchgear

Abstract

The invention relates to a directly-operated three-station disconnecting switch and a gas-insulated switchgear. The directly-operated three-station disconnecting switch comprises a working contact seat, a static contact seat, a ground contact seat and a moving contact. An insulating sleeve is arranged between the static contact seat and the ground contact seat to realize integrated connection, so that coaxiality between the ground contact seat and the static contact seat is high. The moving contact can rotate smoothly between the ground contact seat and the static contact seat, thereby guaranteeing normal usage of the switch. The static contact seat and a conductor are connected by hoop type conductive clamps; and the contact resistance of the contact part is low and the flow capacity is high. High-voltage insulating shielding covers are arranged on the working contact seat and the static contact seat, so that the electric field distribution between fractures is optimized and the insulation performance between fractures is improved. The distance between the fractures is shortened and thus the whole size of the switchgear is reduced, so that the materials are saved. A technical problem that the moving contact can not be opened or closed normally under the extreme conditions due to poor coaxiality between the moving contact and the ground contact seat and the static contact seat during turning on and off of the three-station switch in the prior art can be solved.

Description

technical field [0001] The invention relates to a direct-acting three-position isolating switch and a gas-insulated switchgear, belonging to the technical field of isolating switches for gas-insulated switchgear. Background technique [0002] Gas insulated switchgear is compact in structure and reliable in operation, and is widely used in medium and high voltage power transmission and distribution networks for power distribution and line protection. The three-position switch is the main component of the gas insulated switchgear. It is installed in the primary circuit of the switchgear. In the open state, it bears the fracture voltage of the high-voltage circuit; in the grounded state, the circuit is reliably grounded to ensure the safety of staff and equipment; In the gate state, it can carry the normal working current of the switchgear and the short-term rated dynamic and thermal stable current for a long time. The direct-acting three-position switch has simple structure a...

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