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Connecting 3 phases triangle-star transformer NEMA

S

Steve & Julie

Jan 1, 1970
0
Hi,
I wonder why NEMA standard tells to connect star-triangle 3-phases
transformer a so the secondary is lagging the primary. I know the phase
difference is 30 deg but why lagging and not leading? Could it be connected
so it could be leading anyway?
Anyone have an explanation?

Thank you very much

Steve
 
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