Experiment research on the impact of ground potential rising by lightning on 220 kV transformer intelligent components

Smart substation is the important base and support for the smart grid. As critical part of it, intelligent components can promote the primary equipment intellectualization [1,2]. While the phenomenon that intelligent components sometimes break down without any reason and its invalid problem in lightning impulse test indicate that it is extremely urgent to study on the impact of GPR (Ground Potential Rising) on the intelligent components. This paper developed a new port voltage measurement system, which can be used in the complex electromagnetic environment. During the lightning impulse test of 220 kV intelligent transformer, the port voltage of the intelligent components and the GPR of the test hall [3] were both measured. Combing with the grounding system, position of transformer, Marx lightning generator, intelligent components, and the cable grounding method, a detailed analysis is implemented based on the testing result in the time and frequency domain. The measurements will support further research on the impact of GPR on the intelligent components and corresponding protective procedures.