The current plug settings usually range from 10% to 70% in steps of _________ for earth leakage relays.

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NHPC JE Electrical 5 April 2022 (Shift 1) Official Paper
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  1. 20%
  2. 15%
  3. 10%
  4. 5%

Answer (Detailed Solution Below)

Option 3 : 10%
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Earth leakage relays:

  • The earth leakage relay is an electronic device that detects earth failures.
  • This device operates by sensing earth leakages and opening a circuit breaker when the leakage current exceeds the preset value. 
  • The current plug settings usually range from 10% to 70% in steps of 10% for earth leakage relays.
  • Earth leakage relays are used in combination with core balance current transformers.
  • Under normal conditions, the vector sum of the current flow in phase and neutral will be zero.
  • Earth faults cause an imbalance in the current flow in the phase and neutral conductors.
  • Core balance current transformers or zero-phase current transformers are used to sense this current imbalance.
  • The earth fault relay continuously monitors the output of the core balance current transformers.
  • When its output exceeds the present limit, the relay contacts operate. 
  • These relay contacts are used to activate the trip contacts of the circuit breaker and trip it.
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