NETA ETT Level 3 Practice Questions - NETA ETT Level 3 Certified Electrical Testing Technician Exam

A transformer differential relay (87T) uses 'percent-slope' characteristics to:

Increase sensitivity at high through-current Provide stability during through-faults, when CT ratio errors cause spurious operating current proportional to restraining current Shorten the clearing time Reduce the pickup

Correct Answer:

Provide stability during through-faults, when CT ratio errors cause spurious operating current proportional to restraining current

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