With reference to line protection, state True/False for the following statements:

1. In the event of a short circuit, the circuit breaker closest to the fault should open.

2. The relay operating time should be as large as possible.

Question

Question

This question was previously asked in

MPPGCL JE Electrical 28 April 2023 Shift 2 Official Paper

Answer 1

Circuit breaker

A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by current more than that which the equipment can safely carry (overcurrent).
Its basic function is to interrupt current flow to protect equipment and to prevent fire.
In power systems, protection schemes follow the principle of selective coordination. The circuit breaker closest to the fault (downstream) must trip first to isolate the fault while keeping the rest of the system operational.
This prevents unnecessary disconnection of large portions of the electrical network.

Statement 1 is True.

Relay

Relays are electrically operated switches that open and close the circuits by receiving electrical signals from outside sources.
Relays should operate as quickly as possible to minimize damage to equipment and ensure safety.

Statement 2 is False.