Graded electric field insulation system for dynamoelectric machine
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United States of America Patent
Stats
-
Jun 15, 2004
Grant Date -
Mar 14, 2002
app pub date -
Aug 31, 2001
filing date -
Sep 14, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A groundwall insulation system for use in dynamoelectric machines carrying voltage above 4 kV, and preferably in the order of 13.8 kV, or higher has two layers of insulation wound onto the conductors of the high voltage winding. The first layer of insulation has a first permittivity that is greater then the permittivity of the second layer of insulation wound onto the first layer of insulation. As a consequence, at the juncture between the first and second layers there is a sharp increase in the electric field profile as seen through the groundwall insulation.
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