GATE 2024 EE – Question 23
The table lists two instrument transformers and their features:
| Instrument Transformers | Features |
|---|---|
| P) Primary is connected in parallel to the grid | |
| X) Current Transformer (CT) | Q) Open circuited secondary is not desirable |
| Y) Potential Transformer (PT) | R) Primary current is the line current |
| S) Secondary burden affects the primary current |
The correct matching of the two columns is
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Show answer and explanation
Correct answer: (C) X matches with Q and R; Y matches with P and S.
Explanation
A CT is connected in series with the line, so its primary current is the line current (R), and its secondary must never be open-circuited because the flux would rise dangerously (Q). A PT has its primary connected in parallel with the grid (P), and its secondary burden affects the primary current (S). So CT: Q and R; PT: P and S.