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Polarization Index (P.I.) is one of the measures used in evaluating the “goodness” of the insulation resistance of an electric machine. This particular parameter is defined by the IEEE Std 43 as the ratio of the insulation resistance of the motor measured after 10 minutes, i.e. I.R.10, with respect to the insulation resistance measured after 1 minute, i.e. I.R.i, after applying a step dc voltage....
The dc voltage tests procedures for the measurement of the insulation resistance and polarization index of insulated stator, and rotor windings and how to interpret the results are described in this recommended practice.
The dc voltage tests procedures for the measurement of the insulation resistance and polarization index of insulated stator, and rotor windings and how to interpret the results are described in this recommended practice.
After decades of research in insulation systems, little has been published in the area of analyzing the graph of resistance versus time. Plotting the Insulation Resistance versus Time, gives a graph which may be referred to as an “Insulation Resistance Profile” or IRP. In addition to the standard Insulation Resistance (IR) value and the Polarization Index (PI) value, an Insulation Resistance Profile...
In recent years, much has been written about motors concerning storage, startup and operation as they relate to the American Petroleum Institute's (API) Standard 541 and the IEEE Standard 841. Most of these papers and articles assume that the reader has significant knowledge of motor theory and operation. However, this assumption is overly optimistic considering that only a few universities teach...
Dry-band arc resistance determines the quality of fiber optic cable insulation materials. Three different brands of ADSS fiber optic cable qualities are determined with IEEE 1222 standard test method. Results give a ranking of the cables. During the experiment, it is noticed that randomly spread water droplets are a factor for the results. Therefore, the same cables are tested with another standard...
This article investigates the effect of the test solution conductivity on the insulation resistance (IR) measurement, provides the NEMA-approved clarification of the sealed winding test specification, and suggests further clarifications to the sealed winding test procedure.
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