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InterviewSolution
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For a P.T. the nominal ratio is given by which of the following relation?(a) Kn = \(\frac{V_{s(rated)}}{V_{p(rated)}}\)(b) Kn = \(\frac{V_{p(rated)}}{V_{s(rated)}}\)(c) Kn = \(\frac{1}{V_{s(rated)}}\)(d) Kn = Vp(rated)I got this question in quiz.This intriguing question comes from Ratios of Instrument Transformers in portion Extension of Instrument Ranges of Electrical Measurements |
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Answer» RIGHT option is (b) Kn = \(\frac{V_{p(rated)}}{V_{s(rated)}}\) Easiest explanation: In a POTENTIAL TRANSFORMER, the transformation ratio is GIVEN by the ratio of the magnitude of the actual primary voltage to the magnitude of the actual secondary voltage. where, R is the transformation ratio Vp(rated) is the rated primary winding voltage Vs(rated) is the rated secondary winding voltage. |
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