Evaluating Direct-Current Motors Using Motor Circuit Analysis Basics

Electrical Reliability, Insulation Systems, Motor Diagnostics, Motor Management, Reliability, Uncategorized

Howard W Penrose, Ph.D., CMRP MotorDoc LLC, www.motordoc.com The term MCA (Motor Circuit Analysis) is derived from a test method that provides information on the basic components of an alternate-current (AC) or direct-current (DC) electric motor. These basic components include: resistance, measured in Ohms; impedance, measured in Ohms; inductance, measured in Henries; the induction winding…

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Evaluation of Offline Partial Discharge in Vacuum Environments

Electrical Reliability, Energy, Insulation Systems, Motor Diagnostics, Reliability, Smart Grid, Variable Frequency Drive

An evaluation of several insulation types at various degrees of vacuum using repetitive discharge inception and extinction voltage offline testing will be presented.  Insulation systems were evaluated in atmosphere and compared to values to 1mmHg using a commercial partial discharge surge tester.  The insulation systems evaluated include unvarnished windings, dip and bake epoxy, epoxy trickle…

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