Another method of eliminating the ratio error is _________(a) by reducing secondary turns(b) by increasing the primary turns(c) by increasing secondary turns(d) by reducing the primary turnsThe question was asked during an interview.This intriguing question comes from Reduction of Errors in Potential Transformers in portion Extension of Instrument Ranges of Electrical Measurements

Another method of eliminating the ratio error is _________(a) by reduc

1.	Another method of eliminating the ratio error is _________(a) by reducing secondary turns(b) by increasing the primary turns(c) by increasing secondary turns(d) by reducing the primary turnsThe question was asked during an interview.This intriguing question comes from Reduction of Errors in Potential Transformers in portion Extension of Instrument Ranges of Electrical Measurements
Answer» The correct answer is (a) by reducing secondary turns Best explanation: In a P.T., at no LOAD, we get 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 From the above equation it is SEEN that to REDUCE the ratio error, actual ratio and nominal ratio MUST be made equal. This can be done by reducing the secondary turns.

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