Switching no-load Power line is one of the operating duties for circuit breaker.This PaPer gives statistical analysis of overvoltage results of field test on switching 500kV Gezhouba-Feng-huangshan no-load Power line.Test results show that when both Gezhouba and Fenghuangshan substatons are connected with shunt reactors

circuit breaker is restrike free.When the circuit breaker is equipped with closing resistance

overvoltage is loss than 1·3 times.