Answer / muhammad ismail

http://www.alstom.com/grid/products-and-services/engineered-
energy-solutions/hvdc-transmission-systems/HVDC-Back-to-Back/

How to size the Neutral grounding resistor?

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7 Answers  

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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

2 Answers  

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