![]() ![]() Is the meter sufficient precision and are the results repeatable. Was the measurement done immediately after an insulation resistance test? (sometimes high residual voltage on the winding capacitance can interfere with low voltage measurements). Was the motor done directly at the motor terminals (good) or was it done through cables which can add imbalance. ![]() Or far less likely shorted turns causing one coil to have low resistance which shows up in two different phase to phase readings if motor is wound wye (unlikely because typically shorted turns cause escalating damage leading to trip pretty darned quick)įor a critical motor in an industrial plant (one whose failure could have big consequences), I'd want to investigate further to understand. For example maybe there's a high resistance internal connection in that one high reading. I wouldn't necessarily be worried about it causing unbalanced current, I'd more wonder what exactly is causing that high resistive unbalance. More than 10% resistive variation? That sounds a little high to me.
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