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Generator Protection
What are the actual Difference between Voltage restrained over current protection, 51V-R and Voltage controlled over current protection, 51V-C?

Is it true that to activate 51V-R (Voltage restrained over current protection) system voltage will remain constant only pick up current will be 1.5 times of rated current? actually how 51V-R works?

I already know that 51V-C will only work if stator current must be go 75 % of rated (depends on relay setting), and voltage should reduce to 25 % of rated.

Please clarify about both 2 mechanisms.