Stator bar insulation failures often occur as a result of carbon deposits. If a failure occurs while in service it can cause extensive collateral damage to the generator stator core and field, which can extend a forced outage several months. The severe impact of a winding or stator insulation failure on generator availability demonstrates the importance of a thorough, routine leak testing and repair plan. Removing carbon deposits is a bigger job than can be handled by conventional contact cleaners and rags. Industrial degreasers such as Ecolink’s flagship products, Electron and Positron, have been in use for this very application for over 20 years. Approved and in use by Siemens, General Electric and Alstom, these solvent degreasers deliver incredible cleaning performance while also easy to work with including high flash point (above 140°F), high dielectric strength (46,000 volts) and no surface leakage of current in immediate residue tests. More importantly they are very cost-effective saving money on inbound shipping, freight and outbound disposal costs.
Typical field service scope for a stator rewind installation will include:
Stator core preparation, including cleaning, repairs to interlaminar insulation, testing and re-painting. (Some scopes may include a core restack. In other cases, age of the unit or testing results may indicate problems requiring a core replacement.)
Installation of upgraded end winding support system (Certain fossil units).
Installation of new surge and bus rings ( may include provisions for a future Main-Neutral Interchange).
Installation of stator bars, RTDs and wedging and blocking system and testing of individual coils or groups of coils at specified points in the installation.
Brazing and circuit connections
Testing of the completed winding
Painting and miscellaneous finishing details
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