Permanent magnet-operated long-life vacuum circuit breaker

Abstract

The invention discloses a permanent magnet-operated long-life vacuum circuit breaker, which comprises a vacuum arc extinguishing chamber and a permanent magnet-operated mechanism which is connected with the vacuum arc extinguishing chamber through a connecting shaft, wherein the permanent magnet-operated mechanism is equipped with a permanent magnet mechanism controller. In the process of switching off or on the vacuum arc extinguishing chamber, the control chip-based permanent magnet mechanism controller switches off or on the vacuum arc extinguishing chamber at different speeds according todifferent states of the vacuum arc extinguishing chamber so as to lighten the impact force between a moving contact and a fixed contact of the vacuum circuit breaker. Therefore, the service life of the vacuum circuit breaker is prolonged. The permanent magnet-operated long-life vacuum circuit breaker can switch off higher short-circuit current at the rated current of 630 amperes and can switch off the short-circuit current of 20 kA to the maximum. The permanent magnet-operated long-life vacuum circuit breaker can achieve the mechanical life of more than 1,000,000 times.

Description

technical field [0001] The invention relates to a vacuum circuit breaker, in particular to a permanent magnet operated long-life vacuum circuit breaker. Background technique [0002] A vacuum circuit breaker is an electrical device in which the main contacts are opened or closed in a high vacuum environment. After the circuit breaker is manufactured, its opening and closing speed characteristic curves have been determined. When the characteristics of vacuum circuit breaker components are kept unchanged, the opening and closing speed characteristic curves of this circuit breaker cannot be changed. A circuit breaker has only one opening speed characteristic curve and one closing speed characteristic curve. The force characteristic of the circuit breaker can be deduced from the speed characteristic curve of the circuit breaker. Regardless of whether it is a vacuum circuit breaker with an elastic operating mechanism or a vacuum circuit breaker operated by a permanent magnet, ...

AI Technical Summary

Problems solved by technology

The characteristic of this control method is that in the process of operation, the existing vacuum circuit breaker control method does not distinguish the breaking capacity or closing capacity of the vacuum circuit breaker during the opening and closing operation, for example, the breaking current is greater than the rated current or It is less than the rated current and moves the moving contact with the same mechanical characteristics that are not controllable

Images