自能式SF_6断路器灭弧室气压特性计算及分析

Puffer characteristic calculate and research of self-extinguishing SF_6 circuit breaker

自能式SF6断路器的灭弧室体积大小对开断性能的影响很大,若灭弧室体积较大,电弧加热气体气压较低,不足以熄灭电弧;体积较小,长燃弧熄弧能力较弱.以热力学第一定律和流体动力学为基本原理,建立起灭弧室内气压特性的数学模型,对改变结构参数的自能式SF6断路器的气压特性进行了计算.并分析了自能式SF6断路器的开断性能.

The volume of the selfextinguishing type gas circuit breaker's gas chamber has much effect on interruption ability.When the volume of gas chamber is bigger ,the arc can not be extinguished easily, contrary, the feebleness of long arc is less.Based on the first law of thermodynamics and the law of hydrokinetics are based by this paper,the model of gas chamber's gas puffer characteristics has been built up. The interruption ability of a self extinguishing type gas circuit breaker has been investigated while changing several structural factors.Characteristics of interruption are analyzed.