High voltage alternate current isolating switch and earthing switch combination

Abstract

The invention relates to a high voltage alternate current isolating switch and earthing switch combination which is characterized in that an isolating switch is connected with a ball screw by a control mechanism through an insulating pull rod; a center shaft of the ball screw rotates together with the insulating pull rod; a shaft sleeve on the ball screw pushes an isolating switch moving contact fixed on the shaft sleeve of the ball screw to move along the axial direction; an earthing switch drives an earthing switch moving contact by the control mechanism to realize switching-off or switching-on; a main conductive loop when the isolating switch is positioned at the switching-on position is formed by the isolating switch moving contact and an isolating switch fixed contact; and sulfur hexafluoride gas is used as an insulating medium and an arc extinguishing medium. A rated current of the high voltage alternate current isolating switch and earthing switch combination can reach 10,000A. Moreover, the high voltage alternate current isolating switch and earthing switch combination has compact structure and high insulating level and can be applied to a gas-insulated metal-enclosed switchgear (Gas Insulated Switchgear GIS) at the voltage level of 126kV to 1,200kV.

Description

[0001] technical field [0002] The invention relates to the technical field of isolating switches and grounding switches, in particular to a combination of high-voltage AC isolating switches and grounding switches. Background technique [0003] The combination of sulfur hexafluoride high-voltage AC isolating switch and grounding switch is an important component of gas-insulated metal-enclosed switchgear (GIS). When the isolating switch is in the opening position, it needs to reliably isolate the high-voltage live part from the uncharged part. Therefore, the current flow performance and insulation performance of the isolating switch are its two most important performances. With the continuous increase of power system load increase, the power system has higher and higher requirements for the rated operating current of the high-voltage disconnector. The existing high-voltage AC disconnector and grounding switch combination, the shielding structure and the current-through struc...

AI Technical Summary

Problems solved by technology

[0003] The combination of sulfur hexafluoride high-voltage AC isolating switch and grounding switch is an important component of gas-insulated metal-enclosed switchgear (GIS). When the isolating switch is in the opening position, it needs to reliably isolate the high-voltage live part from the uncharged part. Therefore, the current flow performance and insulation performance of the isolating switch are its two most important performances. With the continuous increase of power system load increase, the power system has higher and higher requirements for the rated operating current of the high-voltage disconnector. The existing high-voltage AC disconnector and grounding switch combination, the shielding structure and the current-through structure are usually designed separately, the rated current is low, and the rated current is generally Below 4000A, it is difficult to meet the dual high requirements of the power system for its current flow performance and insulation performance

Images