Water-cooled stator coil header repair process
First Claim
1. A process for repairing leaks in water cooled stator coils having a plurality of hollow conductor strands each having a lead end with an opening therein, and wherein the lead ends of the conductor strands are joined to a header, comprising the steps of:
- (a) sectioning the header into an outboard section, and into an inboard section that remains attached to the conductor strands, such that the lead ends of the conductor strands are accessible;
(b) cleaning the lead ends of the conductor strands and the attached inboard section;
(c) applying a water-tight braze seal over the lead ends of the conductor strands; and
,(d) after the braze seal has been applied, joining the stator coil and the inboard section to a second outboard section.
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Accused Products
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.
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Citations
20 Claims
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1. A process for repairing leaks in water cooled stator coils having a plurality of hollow conductor strands each having a lead end with an opening therein, and wherein the lead ends of the conductor strands are joined to a header, comprising the steps of:
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(a) sectioning the header into an outboard section, and into an inboard section that remains attached to the conductor strands, such that the lead ends of the conductor strands are accessible; (b) cleaning the lead ends of the conductor strands and the attached inboard section; (c) applying a water-tight braze seal over the lead ends of the conductor strands; and
,(d) after the braze seal has been applied, joining the stator coil and the inboard section to a second outboard section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification