In order to simulate the actual harsh electromagnetic environment of substation

and then research the detection method of immunity performance of electronic transformer

based on the original foundation

that the disconnector is used as the disturbance source for the immunity test system of electronic transducer

the disconnector simulated disturbance source is developed

and immunity performance tests of electronic transformer are carried out using the new disturbance source

for advancing standardization of the original test items. In this paper

through the method of controlling the arcing and extinguishing of sphere gap arc by operation of circuit breaker

the system of disconnector simulated disturbance source is developed. The disturbance source system has characters

as the whole electromagnetic disturbance time is adjustable

amplitude of electromagnetic pulse is adjustable

and shell ground potential of the equipment tested is adjustable

space magnetic field and electric field are adjustable

and so on. Through immunity performance tests of electronic transformer

it proves that the disturbance source system can meet the test requirement

and is good stability and high reliability. The test item of immunity performance of electronic transformer by the disconnector simulated disturbance source proposed in this paper

can replace the current test item conducted by small capacitive current in disconnector

so the standardization of the item is further promoted

and the implementation of the new item can effectively reduce the losses of the grid due to electromagnetic interference by electronic transformer.