In a pumped storage power plant, there are long high-voltage cable connected the GIS and the main transformer, inducing different fast transient characteristics compared with conventional power substation. However, pumped-storage power plants are usually in remote mountainous areas, suitable testing opportunities are rare. Therefore, there are few research results on the field measurement of fast transient in pumped-storage power plants. In this paper, fast transients were measured in a 500kV pumped storage power plant. Sensors were developed and installed inside the GIS. The results indicated that the maximum amplitude levels of fast transient are 1.5 P.U. (close) and 1.14 P.U. (open). The voltage steepness of single strike is 0.777kV/ns. The frequency characteristics of fast transient waveforms in the pumped storage power station were also analyzed. The analysis results indicated the frequency components distribution. The high frequency component of fast transient above 10 MHz is very small. The field measurement data and analysis results provide a reference for reducing electromagnetic interference, developing standard waveform, optimizing insulation coordination and overvoltage mitigation methods.

GIS, fast transient, waveform characteristics, pumped storage power station