High voltage circuit breaker can

in case of switching shunt reactor

generate high over voltage

thus causing equipment fault and endangering safe operation of power grid. In this paper

classification method of reignition window and the critical point of overvoltage are proposed on the basis of the principle of generating overvoltage in switching reactor and the duration classification analysis of the over voltage with combination of the test result. The principle of over voltage suppression by phase control technology is analyzed in detail. It is verified by the test that it can effectively control the over voltage to a low level

thus eliminating the threat of excessive over-voltage to the power equipment.