Research on Field Electromagnetic Compatibility Test Method of System Level for Electronic Transformers

The existing current standards for electronic transformers are formulated based on the equivalent of traditional electromagnetic transformers and secondary side protection equipments. In this situation, Although these products have can passed the type test, but there are still a large number of electromagnetic compatibility (EMC) problems still appeared in actual operation. In this paper, based on the actual field application, the interference mechanism of the AIS isolating switch and the electromagnetic transient process on the electronic transformers is simulated. The interference model of the transient electromagnetic field to the secondary side of the electronic transformers and the transmission cables are obtained. Then, a field system-level EMC test method of electronic transformers is proposed. This method is based on the actual equipment and wiring conditions in substations, and the anti-strong electromagnetic disturbance ability of the electronic transformers is evaluated under the condition of "conventional" or "unconventional" operations. Finally, Finally, the field application of system-level electromagnetic compatibility test was carried out in the 330kV Xinsheng Substation, and the fault electronic transformer was tested, which proved the effectiveness of the method.