Motorblog

10 Motor Testing and CBM

Simple voltage readings can be used to perform some limited evaluation of the motor system.  In particular, it can assist in the identification of power quality and motor mis-application.  In this presentation, we will discuss how RMS voltage measurements can be used as part of your CBM program.

9 Motor Testing and CBM

Evaluating the condition of electric motor rotors is not a new concept.  Electric motor repair shops have been using techniques such as growler testing, single-phasing, infrared, vibration and/or dye testing as methods used through the repair process.  In the field, vibration, analog current tests and inductive testing has been used.  Over the past twenty years, a variety of motor circuit analysis and current signature analysis technologies have entered the market providing even greater accuracy in the detection of rotor bars.

8 Motor Testing and CBM

AC and DC High Potential Tests

While the Insulation Resistance, Polarization Index and Dielectric Absorption tests are methods of evaluating general insulation to ground condition, the high potential test is a method of evaluating insulation to ground integrity, or dielectric strength.  There are two basic types of high potential tests: AC and DC, of which we will cover both in today’s presentation.