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Unbalanced voltage

Unbalanced voltage

Unbalanced voltage

(OP)
Hello !

I am an electrical engineer working in a cement factory.
We have a power plant installation of 3 x 8 MW.
I am facing a problem with the unbalanced voltage.
We are using PT's for measuring voltage (6 / 0.1 KV).
This PT have two secondary windings. First one is wye connection and there is the other one which is an open delta connection for measuring neutral to earth voltage.
This second one when we are running the biggest MV motors is going up to 9.5 V. I want to know how can i find the reasons of this unbalance and how can i fix that.
 

RE: Unbalanced voltage

Have you checked your motor for unbalanced resistances or impedances to ground?

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Unbalanced voltage

Open delta can't be used to measure neutral voltage. How are you measuring 9.5V?

RE: Unbalanced voltage

Ah, so. Maybe the OP can clarify.

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