不同灭弧室串联的双断口真空断路器分压特性研究

Research on Voltage Distribution Characteristics of Double-break Vacuum Circuit Breakers with Different Interrupters in Series

文中针对不同灭弧室串联构成的双断口真空断路器电压分布特性展开研究,旨在实现双断口真空断路器的自均压和最大开断能力。基于Ansoft仿真软件,建立了不同结构的12 kV真空灭弧室串联构成的双断口真空断路器电场分析模型,分析了每种组合的电压分布情况并计算了等效电容参数,通过双断口真空断路器等值电路分析了不同灭弧室串联组合的自均压效果。然后搭建了高频分压试验平台,进行了不同灭弧室构成的双断口真空断路器分压试验试验,得到了不同组合方式下的电压分布特性。结果表明:在无均压电容的条件下,通过不同灭弧室的合理组合可改善电压分布情况,获得较好的自均压效果,以提高双断口真空断路器的开断能力。文中的研究工作为减小均压电容和提高双断口真空断路器的开断能力奠定了基础。

The paper focuses on the voltage distribution of double-break vacuum circuit breakers（VCBs） with different interrupters in series, which is used to realize self-voltage-sharing and maximum break capacity of double-break VCBs. Based on the Ansoft, the electric field models of double-break VCBs with different interrupters are established, and then the voltage distribution and equivalent capacitance of double-break VCBs are calculated. Moreover, the effect of self-voltage-sharing was analyzed by the equivalent circuit of double-break VCBs. The test platform is set up to test the voltage distribution of double-break VCBs in high frequency voltage. There are different interrupters connected in series, which consists of different combinations. The voltage distribution of different combinations is gained, which is consistent to the simulation results. The situational and experimental results indicate that the voltage distribution characteristics of double-break VCBs without grading capacitors can be improved by proper combinations with different interrupters and self-voltage-sharing effect can be obtained. The paper supplies the effect methods to improve the voltage distribution and even to gain the self-voltage-sharing effect, which is useful to increase the breaking capacity of double-break VCBs.