Details for Neutral Current Transformer

I think trafo manufacturer is requesting you for REF protection CT to be mounted on the neutral circuit.You can either go in for 1 AMP secondary or 5 AMP SECONDARY.

The full load current of 2500 kVA transformer on LT side would be 3500 Amps. Therefore CT ratio is to be either 3500/1 or 3500/5.

VA burden of the CT is to be 15 VA,class of accuracy is to be 5P10.Knee point voltage has to be calculated depending on the location,cable length etc.

Are you asking for length of LT side XLPE cable? location of factory is District -Sundergarh, Orissa.

And thanks a lot for your concern.

Shashi.

Not site location.

The relay location with referance to CT location.Interconnecting cable length between the relay and CT is required for calculation of resistance.also cable size.with material like aluminium/copper.

Dear Sir,

It means that ,we will size the NCT based on the fulload current of the transformer.

Regards,

E.Santhanakumar