Distribution Line Tie In

Hola,

I think you should use a Y-Y transformer rated 23,90 kV – 24,94 kV connected in the feeder "D". You have to check that feeder "D" phase shift is the same as feeder "A".

Chao

BAM

There are many ways to do this. Can you let us know what is the final voltage ie 13.8 kv/?.Are u also planning to use when one feeder is off or both simultaneously?

My first thought is

WHY?

MR GUY

I don't fully understand what you are doing, or what you are doing it with. However I did study and find that in a voltage regulation transfer between Mexican and US Grid systems one company had converted all the power to DC, which had enabled conforming to AC within a phase range that did not overpower the neutral.

Check with Switchman.

Firstly you need to tell us what your final voltage required is. Assuming that this is 14.40kV the simplest way is to get a 23.90kV/14.40kV transformer and a change over switch. Ensure the phase rotation is the same way. Parallel the new transformer with the existing 23.90 one and connect the change over switch on the secondary side of both transformers

You do not provide enough information. Are the feeders overhead or underground? Do they come from the Utility or a company substation? I would suggest hiring a good electrical consulting engineering company. This is a voltage level that requires competent design work.