High-capacity circuit breaker

Abstract

The invention discloses a high-capacity circuit breaker. The high-capacity circuit breaker comprises a first circuit breaker and a second circuit breaker which are arranged in parallel, wherein the first circuit breaker is arranged on a first circuit breaker substrate; the second circuit breaker is arranged on a second circuit breaker substrate; the first circuit breaker substrate and the second circuit breaker substrate are integrated to form a substrate of the high-capacity circuit breaker; an operating mechanism which is used for turning on and turning off the high-capacity circuit breaker is arranged on the substrate and arranged in the middle of the high-capacity circuit breaker; and turn-off mechanisms of the high-capacity circuit breaker are symmetrically arranged on the substrate by taking the operating mechanism as symmetric center. The high-capacity circuit breaker can be turned on and turned off in a highly-synchronous mode, and is high in short-circuit breaking capacity, high in short-time current resistance and short in production cycle.

Description

technical field [0001] The invention relates to the field of electrical equipment, in particular to a large-capacity circuit breaker. Background technique [0002] Large-capacity circuit breakers are mainly used in power distribution networks with AC 50Hz, rated voltage 400V, and rated current 4000A to 6300A to distribute electric energy and protect lines and power supply equipment from overload, short circuit, undervoltage, ground fault and other hazards. At present, the large-capacity circuit breakers produced at home and abroad are realized by paralleling two circuit breakers, which are composed of two existing universal circuit breakers with a rated current of 2500-3200A; for example, the application number is "200910233921.1", and the name is The invention patent of "circuit breaker" discloses a structure in which two 3200A small-capacity circuit breakers are combined to form a 5000A large-capacity circuit breaker; in this circuit breaker structure, the A, B, and C thre...

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Problems solved by technology

[0003] Two small-capacity circuit breakers are combined side by side to form a large-capacity circuit breaker. Considering the structural safety and the operating mechanism must be able to be installed and fixed on the base, the operating mechanism can only be installed on the edge of the base of the circuit breaker. above; such a structure will bring the following problems: on the one hand, the rotating shaft driven by the operating mechanism of the circuit breaker is close to phase B and C, but far away from phase A, and the rotating shaft is easily distorted and deformed, resulting in the three-phase combination of A, B and C The synchronization of the gate and opening is poor; in addition, the final pressure of phase A is also smaller than that of phase B and C, resulting in low short-circuit breaking capacity and short-term withstand current of the product, and high temperature rise during use; on the other hand, the circuit breaker’s The mechanical strength is affected by the bonding process of the two circuit breaker bases. At present, the base of the circuit breaker is mainly bonded by the method of "resin compound + cast aluminum-silicon alloy". Whether the bond is firm or not depends on the modulation and Whether the resin compound is filled between the two bases; when the two bases are not well bonded side by side, it is easy to deform, fall off, crack, etc., which will seriously affect the reliability and overall performance of the circuit breaker; The manufacturing cycle of the device is long, which affects the product order cycle

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