Vacuum loading switch

Abstract

The invention discloses a vacuum load switch for a high-voltage fixed switchgear, which includes an upper outgoing line of a knife switch, an isolation knife switch, an isolation knife seat, a vacuum interrupter, a lower moving contact, a lower outlet seat, and a connecting busbar , cable outlet plate, isolation knife insulation pull rod assembly, arc extinguishing chamber insulation pull rod assembly, operating mechanism and grounding device, isolation knife switch is connected in series with vacuum interrupter, isolation knife insulation pull rod assembly and arc extinguishing chamber insulation pull rod assembly are all connected with the operating mechanism Transmission connection, isolation knife seat, vacuum interrupter and lower outlet seat are solidly sealed together, the hinge end of the isolation knife switch is provided with a second contact finger spring, and the second contact finger spring is in contact with the isolation knife switch and the isolation knife seat respectively , There is a first contact finger spring at the moving end of the vacuum interrupter, and the first contact finger spring is respectively in contact with the lower moving contact and the lower outlet seat. The invention has high insulation strength, meets environmental protection requirements, is convenient to assemble and use, has high modularization level, and is suitable for standardized and large-scale production.

Description

technical field [0001] The invention relates to a high-voltage fixed switch cabinet, in particular to a vacuum load switch. Background technique [0002] The existing vacuum load switch, such as the ZN28-12 vacuum circuit breaker used in China, has exposed live parts, so it is greatly affected by the environment, has a high failure rate, and has low reliability. For this reason, the Chinese patent document CN1420514 discloses a vacuum automatic load switch on an integrated fully insulated pole, in which the operating mechanism, the isolation knife switch and the vacuum interrupter are all fixed in a sealed box filled with zero-gauge pressure SF6 gas. In order to prevent moisture intrusion and improve its reliability. However, SF6 gas is a greenhouse gas, and its greenhouse effect is 2500 times that of carbon dioxide, which has a great impact on the environment and does not meet environmental protection requirements. In addition, the existing vacuum load switch adopts soft ...

AI Technical Summary

Problems solved by technology

However, SF6 gas is a greenhouse gas, and its greenhouse effect is 2500 times that of carbon dioxide, which has a greater impact on the environment and does not meet environmental protection requirements.

In addition, the existing vacuum load switch adopts soft connection at the moving end of the vacuum interrupter and the connection end of the isolation knife switch. Since the soft connection is charged, the user can only add an insulating partition to separate the bus room and the cable room. The protection level of the switch cabinet is reduced, which brings inconvenience to the user; at the same time, due to the small installation space of the pole of the load switch, the guide gap of the moving end of the vacuum interrupter is also very small, and the vacuum interrupter's gap is small when fastening the soft connection. The bellows cannot bear force, so it is very difficult to assemble

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