Quick trip breaker with function of pneumatic actuation trip

Abstract

The invention relates to a quick trip breaker with the function of pneumatic actuation trip, which comprises a plurality of single-stage breaking units and an operation mechanism with a shared trip rod, wherein each of the single-stage breaking units comprises a shell, a contact device, an arc control device, a wiring device, an over-current trip device and a pneumatic trip device consisting of actuation mechanisms and transmission mechanisms. One single-stage breaking unit is provided with one or two sets of transmission mechanisms in coupled connection with the actuation mechanisms of the single-stage breaking unit, so the transmission mechanisms can be shared by two adjacent breaking units, and the trip action of the actuation mechanisms of the two adjacent breaking units can be transmitted to the shared trip rod of the operation mechanism through a contact arm. One single-stage breaking unit is provided with one or two sets of actuation mechanisms which can transmit the trip action of the stage breaking unit to the transmission mechanism on the connection side synchronously. The breaker has the function of quick trip, and can improve breaking capacity to the maximum, simplify assembly, make the action more reliable, and provide convenience for on-site maintenance.

Description

technical field [0001] The invention relates to a fast-tripping circuit breaker with air pressure actuated tripping function, in particular to an improved circuit breaker which realizes fast tripping and tripping by means of high-pressure gas energy formed by breaking short-circuit current with contacts. Background technique [0002] With the development of the power industry and the transformation of urban and rural power grids, the development of smart buildings in cities, rural urbanization construction, and industrial automation control have put forward higher technical requirements for my country's circuit breakers. my country's circuit breakers are moving towards "small" The most basic thing is to improve the reliability of circuit breakers. Considering that the current design varieties, specifications and performance of circuit breakers in my country are not perfect and not enough for application, users will inevitably have some unreasonable deviations in the actual en...

AI Technical Summary

Problems solved by technology

However, the above two air pressure tripping mechanisms in the prior art cannot be applied to realize the maintenance of the circuit breaker at the use site of the circuit breaker. Taking the invention patent of ZL03145501.8 as an example, the rotating shaft for transmitting the tripping force of the tripping device is arranged On the base, and the force-bearing part on the rotating shaft is arranged opposite to the flange on the contact device, and the trigger on the rotating shaft is arranged opposite to the lock of the operating system. The action of the trigger triggers the lock device to release the circuit breaker. buckle

This relative configuration of the installation mechanism requires high precision parts, and it is required to be completed during the production and debugging process of the multi-pole circuit breaker. The change of the assembly position between the force-bearing member on the rotating shaft may cause the failure of the tripping action of the rotating shaft

Although the air pressure tripping method is an effective means to improve the breaking capacity and tripping speed of the circuit breaker, however, when the tripping and tripping systems of the circuit breaker in the prior art are combined and installed, it can meet the requirements of synchronous breaking of multiple single-pole circuit breakers. / closed, and can meet the high assembly reliability requirements that must be met for the cooperative work of multiple single-pole breaking units, and the design and improvement of the existing mechanism must be carried out

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