Physics · Power Systems
A radial feeder is protected using an inverse-time overcurrent relay with a plug setting of 125% and a time dial setting of 2. If a fault occurs causing the current to rise to four times the rated load current, which of the following best describes the relay's behavior?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The relay will operate instantaneously as the 4x current immediately exceeds the plug setting.
- 2The relay will operate with a delay, and the operating time will depend on the inverse-time curve characteristics.✓
- 3The relay will not operate because it only trips during overload conditions, not short-circuit faults.
- 4The relay may not operate because the fault current is below the time multiplier setting.
Correct answer
The relay will operate with a delay, and the operating time will depend on the inverse-time curve characteristics.
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