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. A capacitance potential device is a VOLTAGE -transforming equipment using acapacitance VOLTAGE divider connected between phase and ground of a power OF POTENTIALTRANSFORMERSThe ratio and phase-angle inaccuracies of any standard ASA accuracy class1of potentialtransformer are so small that they may be neglected for protective-relayi
rated voltages, and the value of C2 is varied by the use of auxiliar y capacitance to maintain ... the actual loading on a particular device under unbalanced voltage conditions, as when short circuits occur, certain conversions must be made. This is described later in more
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