What is Grading Margin?
A. Reduction factor for adjusting the working time of the overload relay. To allow the relay to run faster
B. The reserve factor for adjusting the working time of the overload relay for work safety
C. Working time multiplier of overcurrent relay for determining the actual working time of a relay at a certain value of PSM
D. The difference in the minimum working time for the timing of the main current overload relay with overload current relay
Show Answer
Answer: D
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