Transformers Set 3

reduces weight per kVA ✘ reduces iron losses ✘ reduces copper losses ✘ increases part load efficiency ✔

1.3 ohm ✘ 7.8 ohm ✘ 78 ohm ✘ 13 ohm ✔

primary side ✘ secondary side ✘ low voltage side ✘ high voltage side ✔

lags behind the voltage by about 75° ✘ leads the voltage by about 75° ✘ lags behind the voltage by about 15° ✘ leads the voltage by about 15° ✔

To provide coupling between primary and secondary ✘ To increase the magnitude of mutual flux ✘ To decrease the magnitude of magnetizing current ✘ To provide all above features ✔

llkV ✘ 33kV ✘ 66 kV ✘ 122 kV ✔

in series ✘ in parallel ✘ in series-parallel ✘ in parallel with stator ✔

1 ✘

primary is supplied rated voltage ✘ primary is supplied full-load current ✘ primary is supplied current at reduced voltage ✘ primary is supplied rated kVA ✔

Core insulation voltage test ✘ Impedance test ✘ Radio interference test ✘ Polarity test ✔