Electrical-discharge-inhibiting conformable layer for use in inner-cooler coils
AssigneeSiemens Westinghouse Power Corporation
InventorsFranklin Emery, Douglas Conley, James Lau
Life of this patent
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Abstract
A conformable layer (14) for inhibiting electrical discharge between vent tubes (16) and strands (12) in an inner-cooled coil (5). The conformable layer comprises a resistive inner core (24) and a conductive strip (20) wrapped in a conductive outer wrap (26). The conductive strip (20) is electrically connected to the strands (12) at one end of the coil (5) and left to electrically float at the other end. In this configuration, the conformable layer (14) reduces voltage buildup between the vent tubes (16) and the strands (12) to help prevent electrical damage to the coil (5).
Claims22
A dynamoelectric machine, comprising:
- a rotor;
- and
- a stator positioned adjacent said rotor, said stator including a plurality of high-voltage stator coil sections, each of said stator coil sections comprising
- a plurality of strands elled to form a stack of strands,
- a plurality of vent tubes stacked to form a stack of vent tubes, wherein said stack of vent tubes is positioned adjacent to said plurality of strands to form a stack assembly, said stack assembly having a surface with irregularities,
- a layer of groundwall insulation formed around said stack assembly,
- an outer ground electrode formed around said groundwall insulation, and
- a conformable layer positioned on said surface of said stack assembly, between said stack assembly and said groundwall insulation, wherein said conformable layer conforms substantially to said irregularities and wherein said conformable layer includes a conductive strip for electrically connecting said conformable layer to said stack of strands.
A high-voltage coil for use in a dynamoelectric machine, comprising:
- a plurality of strands elled to form a stack of strands,
- a plurality of vent tubes stacked to form a stack of vent tubes, wherein said stack of vent tubes is positioned adjacent to said stack of strands to form a stack assembly, said stack assembly having a surface with irregularities,
- a layer of groundwall insulation formed around said stack assembly,
- an outer electrode formed around said groundwall insulation, and
- a conformable layer positioned on said surface of said stack assembly, between said stack assembly and said groundwall insulation, wherein said conformable layer conforms substantially to said irregularities and wherein said conformable layer includes a conductive strip for electrically connecting said conformable layer to said stack of strands.
A conformable layer for inhibiting electrical discharge between a vent tube and a strand in a stacked coil assembly, comprising:
- an inner core including a conductive strip, and
- an outer conductive layer formed around said inner core and said conductive strip.
Dependencies are inferred from the claim text.