GATE EE 2015 Set 1 — Question 33
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Electrical & Electronic Measurements → Instrument Transformers → CT & PT
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Question
The primary mmf is least affected by the secondary terminal conditions in a
Correct answer
(C) current transformer.
Solution
In a current transformer (CT), the primary winding is connected in series with the line whose current is being measured. The primary current is determined by the load in the main power circuit and is independent of the secondary circuit conditions (the burden). Consequently, the primary mmf () is essentially constant and least affected by changes in the secondary terminal conditions. In contrast, for power, potential, and distribution transformers, the primary current is highly dependent on the secondary load to maintain the core flux.
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