Research on AC Withstand Voltage Test Method of Semi-insulation Voltage Transformer of 1000MW Generator Export
When conducting AC withstand voltage test on the cast in electromagnetic voltage transformer(PT)at the generator outlet of 1000MW thermal power generation unit,because the PT transformer is relatively large and the capacitance of a single secondary winding to the primary winding,other secondary windings and the ground is rela-tively large,if the traditional triple frequency induction withstand voltage test is adopted,its secondary winding is easy to overload.There are two solutions:The shunt compensation of reactors can be used to reduce the current flow-ing through the secondary winding;The series resonant device is used to pressurize directly from the primary side.
sem-insulatingpouring typecasting electromagnetic typetriple frequency induced withstand volt-ageseries resonance
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