Abstract

Insulation breakdown of water-cooled generator stator windings occurs frequently due to leakage of cooling water and absorption into the insulation material. Leakage and absorption problems of water-cooled stator windings are often found during regular preventive maintenance. To evaluate cooling water leakage and absorption, diagnostic tests were performed on two water-cooled turbine generators, which have been in service for 13 and 17 years, respectively. The test results of the measured electrical properties such as dissipation factor($tan{\delta}$), capacitance and AC leakage current for water-cooled generator stator windings with wet bars are reported in this paper.

Keywords

• Water-cooled generator;
• Stator winding;
• Cooling water leakage;
• Diagnostic test;
• Dissipation factor;
• Wet bar

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Acknowledgement

Supported by : 한국동서발전(주)

References

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Cited by

1. Prognostics for Stator Windings of Water-Cooled Generator Against Water Absorption vol.39, pp.6, 2015, https://doi.org/10.3795/KSME-A.2015.39.6.625