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Semi-conducting layer for insulated electrical conductors

  • US 5,066,881 A
  • Filed: 07/23/1990
  • Issued: 11/19/1991
  • Est. Priority Date: 08/23/1984
  • Status: Expired due to Fees
First Claim
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1. An internal grading layer for an electrically conductive winding which includes a plurality of conductive strands bundled together in at least two adjacent columns and a first strand of said plurality of conductive strands being transposed with respect to a second strand of said plurality of conductive strands in an adjacent column, an inert transposition filler material disposed proximate said conductive first and second strands to round off that portion of the bundled together conductive strands, said bundled together conductive strands and said filler material being surrounded by an insulative material, the internal grading layer comprising:

  • a semi-conducting pyrolyzed glass fiber layer having a resistivity in a range of 200 to 10,000,000 ohms per square disposed between said filler material and said insulative material in intimate contact with said insulative material and electrically coupled to said conductive first and second strands.

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