Modular arc extinguishing device for plastic shell type circuit breaker

Abstract

The invention discloses a modular arc extinguishing device for a plastic shell type circuit breaker. The modular arc extinguishing device comprises a moving contact, a static contact and an arc extinguishing chamber, wherein the moving contact is in movable contact connection with the static contact; the moving contact is arranged in the arc extinguishing chamber; and arc extinguishing grid pieces which are fixedly arranged are arranged in the arc extinguishing chamber. The modular arc extinguishing device further comprises an arc extinguishing module which is arranged at the static contact end of the arc extinguishing chamber. The arc extinguishing module is divided into an upper-layer structure and a lower-layer structure which are integrally connected, wherein the upper layer is an arc extinguishing channel, the lower layer is a cable channel, a seat plate is arranged between the two layers, the cable channel is used for placing a static contact wiring terminal, the arc extinguishing channel is provided with arc extinguishing pore plates which are arranged at intervals, a partition plate I is arranged between the arc extinguishing module and the arc extinguishing chamber, and a hole I is formed in the upper end of the partition plate I and communicates with the arc extinguishing channel. Compared with a traditional arc extinguishing structure for the plastic shell type circuit breaker, the device provided by the invention is reasonable in structural design, low in temperature rise and good in arc extinguishing effect.

Description

technical field [0001] The invention relates to the technical field of switchgear, in particular to a modular plastic shell type circuit breaker arc suppression device. Background technique [0002] The traditional plastic case circuit breaker generally has a rated operating voltage between 400-690V. If it is applied to more than 800V, such as a high-voltage plastic case circuit breaker for photovoltaic power generation system protection, the rated operating voltage is required to be 1000V. The structure of the plastic case of the circuit breaker can no longer meet the application requirements, there is a problem of temperature rise, and when the moving contact and the static contact are disconnected, the arc generated is too long, even if the arc is extinguished by the arc extinguishing grid, there is still a part of the arc The problem of burning out the terminal blocks will cause a short circuit accident. Contents of the invention [0003] In order to solve the above t...

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Problems solved by technology

[0002] The traditional plastic case circuit breaker generally has a rated operating voltage between 400-690V. If it is applied to more than 800V, such as a high-voltage plastic case circuit breaker for photovoltaic power generation system protection, the rated operating voltage is required to be 1000V. The structure of the plastic case of the circuit breaker can no longer meet the application requirements, there is a problem of temperature rise, and when the moving contact and the static contact are disconnected, the arc generated is too long, even if the arc is extinguished by the arc extinguishing grid, there is still a part of the arc The problem of burning out the terminal leads to the occurrence of short circuit accidents

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