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Transformer Equivalent Model for Switching Transients Computation
Maekawa, Toshihiro,Nishiwaki, Susumu,Takahashi, Hideaki,Chigiri, Takeshi,Hosokawa, Osamu,Saida, Toshiyuki The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.4
We measured transient recovery voltage (TRV) in a 1500 MVA-525 kV/276 kV/63 kV transformer of the three-phase-in-one-tank type. We proved that TRV can be measured by interrupting the current generated by discharging a capacitor of low voltage through the transformer. The current was interrupted at its zero point by a diode at a low voltage. To calculate TRV via a computation, we developed a transformer equivalent model composed of a L-C multi-mesh circuit. The TRV waveform computed using the transformer equivalent model we developed agreed well with the measured TRV waveform.