Ratio error in a P.T. depends on _________(a) secondary current(b) primary voltage(c) secondary current(d) turns ratioI have been asked this question in an interview for internship.The doubt is from Reduction of Errors in Potential Transformers in section Extension of Instrument Ranges of Electrical Measurements

Ratio error in a P.T. depends on _________(a) secondary current(b) pri

1.	Ratio error in a P.T. depends on _________(a) secondary current(b) primary voltage(c) secondary current(d) turns ratioI have been asked this question in an interview for internship.The doubt is from Reduction of Errors in Potential Transformers in section Extension of Instrument Ranges of Electrical Measurements
Answer» The CORRECT answer is (c) secondary current The best I can explain: In a P.T., the difference between actual RATIO and TURNS ratio is GIVEN by the relation, where, R is the ratio error n is the turns ratio Is is the secondary winding current Ie is the IRON loss component Im is the magnetising component It is seen from the above equation that the ratio error in a P.T. depends on the secondary current, magnetising and iron loss components of current.

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