This month’s Featured Technical Paper is from the Proceedings of the 2017 International Conference of Doble Clients. The paper is titled: The Importance of Factory Voltage Endurance Testing to Evaluate Stator Winding Corona Suppression Systems.
The Voltage Endurance Test (VET) can be an effective method for determining expected deterioration of the Outer Corona Protection (OCP) for generator stator windings. The VET can reveal potential reliability issues with the OCP, which can affect long term reliability of the winding. Reliability of the OCP depends not only on the design, materials and application of the OCP, but also on the quality of the ground insulation underneath. Deterioration of the OCP will occur if Partial Discharge (PD) activity (internal corona) is present in the outer layers of the groundwall insulation underneath the OCP. The author’s company has done extensive research and development to enhance the reliability of the OCP for generator stator windings under all operating conditions and the VET was an essential part of that reliability improvement process.
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