What are the protections used in 415 V Class II side?

1 Answer

Answer :

LV to UPS

1. CTZM

2. 50 (instantaneous over current)

3. short circuit

UPS to PMCC S & T

1. 51 RYB (inverse over current)

2. 27 (under voltage)

3. 51N (earth fault)

From Class III to Class II tie

CTZM at Class III and 51, 51N at Class II. 

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