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http://dx.doi.org/10.5370/KIEE.2011.60.10.1972

Water Absorption Sensor of Generator Stator Bar Insulation using Cross Capacitance  

Bae, Yong-Chae (한전 전력연구원)
Kim, Hee-Soo (한전 전력연구원)
Lee, Doo-Young (한전 전력연구원)
Lee, Wook-Ryun (한전 전력연구원)
Lee, Rae-Deok (표준과학연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.60, no.10, 2011 , pp. 1972-1977 More about this Journal
Abstract
The mechanical integrity of generator stator windings is one of the critical point because the electric power is generated and conducted to power system through these windings. To cool down the heat emitted from generator winding during its operation, a majority of generators use de-mineralized water characterized by high cooling efficiency. Contrary to such the excellent cooling efficiency, however, the damaged bar insulations attributed to the absorption of cooling water in the generator stator winding lead to highly time- and cost consuming efforts as well as to service deterioration due to unexpected forced outage of generator. It is described that the new design of water absorption sensor using cross capacitance for generator in power plant in order to increase the reliability of water absorption diagnostics for generator stator bar insulation.
Keywords
Generator; Stator bar; Insulation; Cross capacitance; Dielectric constant; Water absorption;
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  • Reference
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