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Factors Affecting the Failure of Copper Connectors Brazed to Copper Bus Bar Segments on a 615-MVA Hydroelectric Generator at Grand Coulee Dam.

DE88005481

Publication Date	1988
Personal Author	Atteridge, D. G.; Klein, R. F.; Layne, R.; Anderson, W. E.; Correy, T. B.
Page Count	48
Abstract	On March 21, 1986, the United States Bureau of Reclamation experienced a ground fault in the main parallel ring assembly of Unit G19 - a 615-MVA hydroelectric generator - at Grand Coulee Dam, Washington. Inspection of the unit revealed that the ground fault had been induced by fracture of one or more of the copper connectors used to join adjacent segments of one of the bus bars in the north half of the assembly. Various experimental techniques were used to detect and determine the presence of cracks, crack morphology, corrosion products, and material microstructure and/or embrittlement. The results of these inspections and recommendations are given. 7 refs., 27 figs. (ERA citation 13:017914)
Keywords	Water Current Power Generators Brazing Corrosion Products Cracks Electric Grounds Failures Industrial Radiography Inspection Metallography Oxidation ERDA/130700 Grand Coulee Dam Washington
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	97I - Electric Power Production
Corporate Authors	Battelle Pacific Northwest Labs., Richland, WA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	198814
Contract Number	AC06-76RL01830

Factors Affecting the Failure of Copper Connectors Brazed to Copper Bus Bar Segments on a 615-MVA Hydroelectric Generator at Grand Coulee Dam.

Factors Affecting the Failure of Copper Connectors Brazed to Copper Bus Bar Segments on a 615-MVA Hydroelectric Generator at Grand Coulee Dam.
DE88005481

Publication Date	1988
Personal Author	Atteridge, D. G.; Klein, R. F.; Layne, R.; Anderson, W. E.; Correy, T. B.
Page Count	48
Abstract	On March 21, 1986, the United States Bureau of Reclamation experienced a ground fault in the main parallel ring assembly of Unit G19 - a 615-MVA hydroelectric generator - at Grand Coulee Dam, Washington. Inspection of the unit revealed that the ground fault had been induced by fracture of one or more of the copper connectors used to join adjacent segments of one of the bus bars in the north half of the assembly. Various experimental techniques were used to detect and determine the presence of cracks, crack morphology, corrosion products, and material microstructure and/or embrittlement. The results of these inspections and recommendations are given. 7 refs., 27 figs. (ERA citation 13:017914)
Keywords	Water Current Power Generators Brazing Corrosion Products Cracks Electric Grounds Failures Industrial Radiography Inspection Metallography Oxidation ERDA/130700 Grand Coulee Dam Washington
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	97I - Electric Power Production
Corporate Authors	Battelle Pacific Northwest Labs., Richland, WA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	198814
Contract Number	AC06-76RL01830