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Dry transformer problem

Dry transformer problem

Dry transformer problem

(OP)
Folks
We suspect some problem with our dry transformer 6.9 KV to 480 Volts step down.
We did phase to ground megger testing and didn't find any problem. What other test do you suggest to conform the transformer is working fine? We are going to recommend an impedance check of the primary delta winding to see if it is balanced.
Anything else?

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