Partial discharge influence on dissipation factor values during stator-bar testing

摘要

Dissipation factor (DF) and partial discharge (PD) measurements are the most popular methods used to evaluate the insulation condition of stator bars, coils, and complete windings of rotating machines [1], [2]. However, the relationship between the PD characteristic parameters and DF values has not been well understood [3]-[6]. For example, an increase or decrease in PD values does not always result in a proportional change of DF values [6]. To increase the knowledge base in this topic, this article investigates how PD activity can influence DF values in stator-bar testing.