Contact system of circuit breaker

Abstract

The invention discloses a contact system of a circuit breaker; the contact system comprises a contact support mechanism; the front end of the contact support mechanism is connected with a spring bracket; the back of the contact support mechanism is connected with a linkage mechanism; a movable contact unit is arranged on the front side of the contact terminal support mechanism; the back of the front end of the movable contact unit is in contact with primary and secondary springs in the spring bracket; and a contact blade on the front side of the front end of the movable contact unit is in contact connection with a static contact unit. By adopting the structure, the increasing of the length of a contact line of the movable and static contacts is realized, the heating radiating area is increased, the electric stability of the circuit breaker is improved and the purposes of reducing temperature rising and improving short-time endurance capacity are achieved; meanwhile, the breaking capacity and the short-time endurance capacity of the short-circuit current of the circuit breaker are improved, the working over-travel of the contact system is extended and the electrical endurance of the circuit breaker is prolonged.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and relates to a contact system of a circuit breaker, which can enhance the instantaneous current withstand capability of the circuit breaker when the circuit breaker is short-circuited, improve the breaking capacity and energization capacity, and ensure reliable breaking in live operation. Background technique [0002] With the doubling of demand in the power industry and the continuous improvement of power grid capacity, resulting in frequent occurrence of short-circuit accidents, the short-circuit current has increased exponentially and dozens of times compared to before. It is required to be equipped with circuit breakers with ultra-high short-circuit breaking capacity, instantaneous current withstand capacity, large rated current, low temperature rise, segmental reliability, miniaturization, and light weight. [0003] At present, a plurality of isolated insulating w...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a contact system of a circuit breaker, which solves the problem of reducing the temperature rise of the body in the prior art, the number of circuits of the contact system is small, the available space is small, heat dissipation and short-term withstand current are carried Low capacity, low breaking capacity, asynchronous breaking and opening, the contacts are not burned at the same time, the electrical life of the contacts is short, and the circuit breaker cannot be miniaturized, lightweight, and large-capacity

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