Multi Physical Field Coupling Calculation of Airflow Characteristics of SF6 Circuit Breaker Based on Actual Gas Model
The Redlich-Kwong state equation of the real gas and the governing equations of the flow field were combined to solve the problem.The distribution of physical parameters of the interrupter was attained under the condition of the circuit breaker in small capacitive current interruption by analysis of the 126kV capacitor group SF6 gas circuit breaker arc extinguishing chamber in air flow field, which is according to enthalpy flow arc model and dynamic model of non-equilibrium arc energy built by microscopic parameters of plasma. The dielectric recovery characteristic curves in arc contacts after the arc extinguished were attained through the coupling calculation in the field of electric and gas flow. Calculation results show that: When the circuit breaker is opening the small capacitive current, the effect of breaking speed on arc burning time is very small and arc extinguished in advance. The arc gap conductivity is about 700S/m, and the thermal conductivity is about 1.1W/m·K at arc extinguishing time. The transient recovery voltage is always lower than that of the breakdown voltage, and the electric arc can successfully break without reburning. To make the short arcing time have a large arc distance, and the large nozzle should be open enough to be strong for the gas blowing condition, the optimum opening speed is 9.6m/s.
Circuit breaker Redlich-Kwong state equation numerical calculation gap breakdown margin
An Su Xin Lin Yalong Xia Feiming Wang
School of Electrical Engineering,Shenyang University of Technology,Shenyang,110870,China
国际会议
西安
英文
1-5
2016-09-01（万方平台首次上网日期，不代表论文的发表时间）