Description
In Part 1 of our five-part “Basics of Rotating Machine Testing” how-to video series, Alexander Herrera—an OMICRON application engineer specializing in rotating machines—demonstrates how to perform DC Insulation Resistance (IR) and Polarization Index (PI) measurements on stator windings of rotating electrical machines. Learn how to execute these tests for a fast, effective assessment of insulation health, and discover how to correctly interpret your measurement data.
00:07 - Introduction to IR and PI testing
00:29 - How OMICRON’s DIRANA measures IR and PI
01:00 - Measuring multiple phases simultaneously for efficiency
01:30 - Setup: Starting the process and selecting phases
01:48 - Interpreting results in Primary Test Manager (PTM)
02:15 - Understanding PI and resistance data points
02:45 - Troubleshooting: Recognizing signs of insulation abnormalities
DC Insulation Resistance and Polarization Index measurements are among the four primary test procedures OMICRON recommends for assessing the insulation health and integrity of stator windings in rotating electrical machines. Don't miss the rest of our how-to videos about the following diagnostic measurements:
- Part 2: Capacitance & Dissipation/Power Factor (Tan Delta) Measurement
- Part 3: Voltage Withstand (Overvoltage/Hi-Pot) Measurement
- Part 4: Partial Discharge (PD) Measurement
To ensure comprehensive machine maintenance, we also recommend checking for damaging inter-laminar insulation faults (hotspots) in the stator core. Watch Part 5: Stator Core Low Energy (EL CID) Test to see how Alex performs this inspection and analyzes the results.
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