Transformer

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Cub57 said:
Checking a transformer 3 phase the primary and secondary should not read continuity to ground correct


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I guess it is completely disconnected? And by ground you mean the frame / laminations?
I've not seen a transformer with an internal ground connection, but I suppose it is possible.
What kind / size of transformer?
 
Between what points are you taking a measurement? If you mean from H1, H2, H3, X1, X2, or X3, or, if present, any of the voltage adjustment taps, no, you shouldn't have continuity to ground or neutral (H0 or X0).

eta: a *bit* like a compressor for air conditioning. Three terminals on top, should all have continuity between each other, and nothing from terminals to chassis/ground. If there is no continuity from terminal to terminal, there is an open motor winding. Continuity between terminal and ground and the compressor is shorted out.
 
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Actually, if a transformer has an X0 or H0 terminal it must be part of a wye winding set and there must be continuity through the winding from each ungrounded terminal to its corresponding neutral. Unless there is a neutral to ground bond inside the transformer, a disconnected transformer will not show continuity from primary to secondary or to ground.

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