Description
In Part 4 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 a Partial Discharge (PD) measurement on stator windings, one of the most sensitive diagnostic methods available. Learn how to detect critical insulation defects like voids, delamination, and end-winding issues. Alex demonstrates the phase-by-phase measurement process and shows you how to recognize abnormal PD levels.
00:08 - Introduction to PD testing for rotating machines
00:32 - Setup overview and essential safety considerations
01:00 - Step-by-step phase measurement using OMICRON’s CPC 100 and MPD 800
01:38 - Efficiency: Transitioning to dissipation factor and capacitance tests
01:55 - Interpreting PRPD diagrams and charge data
02:25 - Analyzing trends and the importance of linear scaling
02:55 - Recognizing high-magnitude PD in the end-winding
03:22 - Summary and key takeaways for defect diagnosis
PD measurements are among the four primary test procedures recommended 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 1: DC Insulation Resistance & Polarization Index (PI) Measurement
- Part 2: Capacitance & Dissipation/Power Factor (Tan Delta) Measurement
- Part 3: Voltage Withstand (Overvoltage/Hi-Pot) Measurement
To ensure comprehensive machine maintenance, we also recommend checking for damaging inter-laminar insulation faults (hotspots) in the stator core of machines. 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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