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This document discusses measurement variations of insulation resistance (IR) and polarization index (PI) over time in high voltage electrical machines. It reviews the theory of IR testing and describes the different types of currents that flow through insulation: capacitive, conduction, surface leakage, and dielectric absorption. It examines how IR/PI values vary during machine operation depending on these current behaviors, insulation condition over time, and the constant time parameter of IR testing. The

Author

Ratheesh Kumar

Language

EN