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Does anyboydy knows how to ratio a delta/zig-zag transformer?

Does anyboydy knows how to ratio a delta/zig-zag transformer?

Does anyboydy knows how to ratio a delta/zig-zag transformer?

(OP)
I have 3 phase 480/208-120 delta/zig-zag transformer that gave me bad ratio when tested with a Vanguard TTR test set. Any ideas how to ratio this transformer using a voltage source on the primary and a voltmeter on the secondary?

RE: Does anyboydy knows how to ratio a delta/zig-zag transformer?

I ran across this some time ago. I was also using the Vanguard TTR test set.

If memory serves I tested it as a Delta-Delta

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