Research on Optimization of Overvoltage Suppression Method of Switching off Shunt Reactor with Vacuum Circuit Breaker

Aiming at the problem of overvoltage fault caused by the vacuum circuit breaker breaking the shunt reactor, this article based on factors such as the cut-off current value or the dynamic insulation strength of the medium of the vacuum circuit breaker breaking the shunt reactor, according to the comprehensive analysis of the circuit breaker transient process fracture gap continuous arc re-ignition and the extinguishment phenomenon caused and factors affecting multiple prestrike phenomenon, an ATP-EMTP was used to establish the arc-reignition of the vacuum circuit breaker and the shunt reactor arc re-ignition model, and build a test platform at the fault site for test verification. The effects of the parameters of the arrester, the installation position of the arrester, and the capacitance of the shunt capacitor have impact on the vacuum circuit breaker breaking the shunt reactor is simulated, and research results show that the arrester can reduce the overvoltage at its installation position, and the effect of limiting the overvoltage with a low volt-ampere curve is more obvious; The shunt capacitor can effectively slow down the overvoltage value and has a good suppression effect on the over-frequency oscillation frequency and steepness.