Isolation transformer for fault reduction

[mbrooke]

since he has to derive a neut his choices are limited
iso or grounding xfmr
or get the supplier to give him a grounded supply
unless this is going to another substation for step-down, 34.5 kv seems odd for residential distribution

I am going to try and refrain from offering opinion on complex topics with limited information which are part of some ones job and involves 100's of 1000's of $'s
he should consult with an engineer familiar with the subject matter
this stuff could come back to bite a PE in the @$$

34.5kv is taking over 15 and 25kv class equipment in many POCOs today. Virginia power and Public Service New Hampshire (now Eversource) both have extensive history of operating it with great luck FWIW.


A neutral would be ideal- but remember that it has to be balanced against the cost of being run vs derived artificially.

 

[mbrooke]

That is what helps the iso case. You are just tweaking the Z a bit on a device you are buying anyway. Most of the capital cost is already sunk and thus gets thrown out of the cost comparison.

Thats what I am thinking- seems to come out that way.