Transcription of VOLTAGE TRANSFORMERS
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VOLTAGE TRANSFORMERS
118 VOLTAGE TRANSFORMERSTwo types of VOLTAGE transformer are used for protective-relaying purposes, as follows: (1)the "instrument potential transformer," hereafter to be called simply "potentialtransformer," and (2) the "capacitance potential device." A potential transformer is aconventional transformer having primary and secondary windings. The primary windingis connected directly to the power circuit either between two phases or between one phaseand ground, depending on the rating of the transformer and on the requirements of theapplication.
watts at rated secondary voltage when rated phase-to-ground voltage is impressed across the capacitance voltage divider. The rated burden of the device is the sum of the watt burdens that may be impressed on both secondary windings simultaneously. Adjustment capacitors are provided in the device for connecting in parallel with the
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