This month’s Featured Technical Paper is from the Proceedings of the 2023 International Conference of Doble Clients. The paper is titled: Condition Assessment of Stator Windings Using Conventional Tests and Experimental Tests.
This paper will discuss esperiences condition assessment of stator winding using conventional off-line tests and experimental tests. The conventional tests are the power factor tip-up and DC insulation tests, and the experimental tests involve the variable frequency power factor (VFPF), the Reactance and Sweep Frequency Response Analysis (SFRA) tests. Ten stators with different known conditions were tested, and an analysis of the test results will be described. The stators were in hydrogenerators rated from 35 to 165MVA, 13.8kV and originally built by Westinghouse and General Electric. Most of the stators had their windings replaced with the epoxy-mica insulation system (Neccobond, Thermalastic and Preformed Windings), and a few machines had a complete replacement (winding, core and frame).
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