| 摘要 |
PURPOSE: A power supply unit for measuring impedance of an underground cable line is provided to transform voltages of power sources to the same voltage level by using a transformer control tap to control plural autotransformers, simultaneously. CONSTITUTION: A power supply unit for measuring impedance of an underground cable line includes an input terminal part(2), a plurality of autotransformers(3), a transformer control tap(4), a plurality of 3-harmonics attenuating transformers(5), and an output terminal part(7). The input terminal part(2) includes a plurality of input terminals(1). The autotransformers(3) are connected to the input terminals(1) of the input terminal part(2), respectively. The transformer control tap(4) is connected to the autotransformers(3). The 3-harmonics attenuating transformers(5) are connected to the autotransformers(3), respectively. The output terminal part(7) includes a plurality of output terminals(6) connected to the 3-harmonics attenuating transformers(5), respectively.
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