Discussion
Consider the following statements with respect to current transformers (CTs):
1) Cold-rolled grain-oriented silicon steel is used for protective CTs.
2) Nickel-iron cores are used in CTs used for measurement.
3) CTs used in protection have relatively low core cross-section.
4) Accuracy in protective CTs is not as important as in for metering current transformers.
Which of the given statements are correct?
Answer: D
Statement 1 is correct: cold-rolled grain-oriented silicon steel, which has low losses and high permeability, is used for protective current transformers. Statement 2 is correct: nickel-iron cores, which are very accurate at low flux, are used in CTs for measurement. Statement 3 is wrong: protection CTs must not saturate under fault current, so they have a relatively large core cross-section, not a small one. Statement 4 is correct: protective CTs need not be as accurate as the metering ones. So the correct statements are 1, 2 and 4, option (D); the other options include statement 3.
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