Question

The table lists two instrument transformers and their features:
\begin{tabular}{|l|l|} \hline Instrument Transformers & Features
\hline X) Current Transformer (CT) & P) Primary is connected in parallel to the grid
& Q) Open circuited secondary is not desirable
& R) Primary current is the line current
\hline Y) Potential Transformer (PT) & S) Secondary burden affects the primary current
\hline \end{tabular}
Which matches are correct?

• A. \( X \) matches with \( P, Q \); \( Y \) matches with \( R, S \).
• B. \( X \) matches with \( P, R \); \( Y \) matches with \( Q, S \).
• C. \( X \) matches with \( Q, R \); \( Y \) matches with \( P, S \).
• D. \( X \) matches with \( Q, S \); \( Y \) matches with \( P, R \).

Hint:

Current transformers (CTs) should not have an open-circuited secondary, while potential transformers (PTs) operate in parallel.

Answer 1

The Correct Option is C

Step 1: Identifying transformer features.
- For CT (X): \( Q \) (Open-circuited secondary not desirable) and \( R \) (Primary current is the line current) apply.
- For PT (Y): \( P \) (Primary is connected in parallel to the grid) and \( S \) (Secondary burden affects the primary current) apply.
Hence, the correct option is (C).