Question

In a substation Single Line Diagram (SLD), which equipment is typically placed closest to the incoming line?

• A. Circuit breaker
• B. Current transformer
• C. Surge arrester
• D. Power transformer

Hint:

Surge arresters are placed near incoming lines to divert overvoltage surges safely to earth.

Answer 1

The Correct Option is C

Concept: A surge arrester protects substation equipment from lightning and switching surges.

Step 1: Incoming lines may carry high voltage surges due to lightning or switching operations.

Step 2: These surges must be diverted to earth before they reach important substation equipment.

Step 3: Therefore, the surge arrester is placed very close to the incoming line.

Step 4: This arrangement protects circuit breakers, transformers, and measuring equipment. Hence: \[ \boxed{\text{Surge arrester}} \]