Introduction: The variable frequency power source device is used to conduct the induced withstand voltage test for transformer with PD measurement. The test needs few equipment, and wiring is flexible. Especially for 220kV and below transformer, because capacitive current of test object is low and reactive power capacity of needed power source is small, only variable frequency power source cabinet and intermediate transformer (not compensation reactor ) are needed to adjust test frequency and make power source capacity minimum. Owning to limitations to transportation weight and size, this transformer is transported through temporary oil tank and installed by inserting iron yoke on site to fix the transportation and installation problem. In order to inspect the quality of on-site assembling, hand-over test and induced withstand voltage test with PD measurement are conducted on site.
Connection group: YNd11
Rated voltage ratio: (550±2.5%)/20kV
Rated current: 755.8/20784.6A
No-load loss: 274.8kW
No-load current: 0.12%
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