Answer / k.prakashchandra

Output voltage ? For calculation ,find out-put watt-h =V x
A x back up hours.Divide by 12 (battery voltage) to get
total AH of the batteries .

Dear All, In a 400V power system, ratio of three current transformers installed incoming switchgear is 4000/1. Maximum three phases short circuit current of this system is 48kA. One CT is installed on neutral of upstream transformer (6/0.42kV, solidly earthed) for 51G protection. Would you please inform me about the correct CT ratio of this current transformer (on neutral)?? Thanks a million

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