Power Factor Insulation Diagnosis - University of Minnesota

Power Factor Insulation Diagnosis Demystifying Standard Practices Nov 4th 2014 Dinesh Chhajer, PE MEGGER 50th Annual Minnesota Power Systems Conference . 2 ... Specimens like bushings, three winding transformers , inter phase insulation of rotating machinery sometimes exhibits negative PF values. PF values cannot be negative. It is a phantom value.

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