Disconnector is one of the important equipments in power system. The bus-transfer current ability is as an important parameter of the equipment selection. So the disconnector’s bus-transfer current switching test is necessary. This paper combines the relevant standards

not only for the mechanism of disconnector switching bustransfer current is discussed

and the test principle of in the laboratory is given

a new test method and test circuit is present for a gas insulated disconnector in GIS switching bus-transfer current test. The simulation analysis and the type test verification show that the method can meet the requirements of gas insulated disconnector switching bus-transfer current test. The test parameters are in accordance with the relevant provisions of the standard GB1985—2014 and IEC 62271-102—2013.