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Cooling and insulating system for extra high voltage electrical machine with a spiral winding

  • US 4,164,672 A
  • Filed: 08/18/1977
  • Issued: 08/14/1979
  • Est. Priority Date: 08/18/1977
  • Status: Expired due to Term
First Claim
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1. An insulating structure for use in a rotating electrical machine with a high voltage rating on the order of 500 kV and having an armature winding comprised of phase coils disposed in paths which spiral outwardly about the axis of rotation of the machine with interphase spaces formed between adjacent coils, the insulating structure including the combination of an insulating layer disposed within each interphase space, and at the inner and outer peripheries of the winding, each layer comprising a plurality of superposed sheets formed of a material capable of being impregnated with a dielectric liquid, a dielectric liquid impregnated in the material of the insulating layers, means forming passageways extending between each side of each layer and the coil adjacent thereto, a transformer oil in the passageways in heat exchange contact with the coil surfaces, and means for circulating the oil through the passageways for cooling the coils.

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