Read the given Assertion (A) and Reason (R) carefully and select the correct option.

(A): The burden of an instrument transformer is usually expressed in volt-amperes (VA).

(R): Burden is the total impedance of the connected devices, including meters, relays, and wiring

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  1. Both A and R are true and R is the not the correct explanation of A. 
  2. A is false, but R is true.
  3. A is true, but R is false.
  4. Both A and R are true and R is the correct explanation of A.

Answer (Detailed Solution Below)

Option 1 : Both A and R are true and R is the not the correct explanation of A. 
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Detailed Solution

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Burden of an instrument transformer
F1 Vinanti Engineering 22.03.23 D3
The burden is defined as the load connected across its secondary potential transformer.

The burden is specified as VA.

The burden in PT is given by:

\(R_{Burden}={V_{out}\over I_{sec}}\)

The rated burden of a PT is a VA burden that must not be exceeded if the transformer is to operate with its rated accuracy.

From the above explanation, we found Both A and R are true and R is the not the correct explanation of A. 

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