Water-cooled stator coil header repair process

Details Water-cooled stator coil header repair process Water-cooled stator coil header repair process

1995-12-08

1998-06-02

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219 8518, 219 8522, 228119, B23K 100

Patent

active

057603715

ABSTRACT:
A process is disclosed for repairing leaks in turbine generators that have water cooled stator coils with hollow conductor strands. Such generators have a tendency to leak where the stator coil joins a header. Once a leak is detected the repair is accomplished by following the steps off the invention. First, the header is cut into an outboard section, and into an inboard section that remains attached to the conductor strands. Second, the exposed lead ends of the conductor strands and the attached inboard section are cleaned to remove oxidation. Third, a water-tight braze seal is applied over the lead ends of the conductor strands. And finally, the stator coil and the inboard section are joined to a new outboard section.

REFERENCES:
patent: 3614493 (1971-10-01), Collings et al.
patent: 4066203 (1978-01-01), Davies
patent: 4629917 (1986-12-01), Brem
Taillon, J., et al., In Place Brazing solution To Liquid Cooled Stator Winding Leaks, Mechanical Dynamics and Analysis, Inc., Schnectady, N.Y.
Comprehensive Waterclip Solution, ABB Power Generation, Inc., Richmond, VA.

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