Experiment and Research on Induced Electric Field Generated by 110kV AIS Disconnecting Switch

In air-insulated substations, the electromagnetic interference due to the disconnecting switch action is very strong, the most serious of which is the operation of the no-load bus. Electronic instrument transformers are widely used in existing substations, electromagnetic interference will affect its normal operation, and cause the protection device to malfunction. The operation shows that the failure rate of the electronic instrument transformer is very high, which indicates that there are deficiencies in the electromagnetic compatibility monitoring and evaluation prescribed by the existing national standards, and therefore it is necessary to improve. It is difficult to establish a test platform for disconnecting switch operation in actual operation. Therefore, this paper proposes a simulated interference source system of the disconnecting switch, which is exactly in line with the electromagnetic environment produced by the actual disconnecting switch and has various advantages. It is to test the electronic mutual inductance. The electromagnetic compatibility of the device lays the foundation for the research on the standardized test method for the immunity of the electronic instrument transformer.