A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 2Ω. What is the ratio error, if the iron loss is 3 W and magnetizing mmf is 250 A?(a) 4%(b) 5.7%(c) 3.6%(d) 4.8%I have been asked this question in an online quiz.My enquiry is from Advanced Problems on C.T. and P.T. in section Extension of Instrument Ranges of Electrical Measurements

A 1000/5 A, 50 Hz correct transformer has a secondary burden comprisin

1.	A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 2Ω. What is the ratio error, if the iron loss is 3 W and magnetizing mmf is 250 A?(a) 4%(b) 5.7%(c) 3.6%(d) 4.8%I have been asked this question in an online quiz.My enquiry is from Advanced Problems on C.T. and P.T. in section Extension of Instrument Ranges of Electrical Measurements
Answer» Right choice is (B) 5.7% Best explanation: E = \(\frac{10}{200}\) V I = 60 A I = \(\frac{mmf}{N_P}\) = 250 A Actual rating R = 200 + \(\frac{60}{5}\) = 212 So, percentage ratio ERROR = \(\frac{K_n-R}{R}\) × 100 = \(\frac{200-212}{212}\) × 100 = 5.7%.

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