Electricity: conductors and insulators – Conduits – cables or conductors – Insulated
Patent
1995-08-24
1998-09-01
Kincaid, Kristine L.
Electricity: conductors and insulators
Conduits, cables or conductors
Insulated
335299, 336223, H01F 2728
Patent
active
058013342
ABSTRACT:
An insulation system for the turns of a multiturn coil in a high voltage electrical generator or motor having the outer strands of each turn insulated with a high dielectric strength material such as mica and having the inner strands insulated with a low dielectric strength material such as double dacron glass (DDG) or single dacron glass (SDG). The outer mica insulated strands of the turn are smaller in width than the inner DDG or SDG insulated strands in order to accommodate the differences in thickness between the mica, DDG, SDG or other materials used for strand insulation and in order to create a higher overall dielectric strength in the ground insulation of the coils. The outer mica insulated strands of the turn are different in thickness from the inner DDG or SDG insulated strands in order to minimize the Eddy and Circulating Current Losses of the winding and in order to accommodate the differences between the mechanical strengths of the mica and the DDG/SDG tapes. More than one outer top or bottom strands can be insulated with mica in order to accommodate generator or motor designs and applications where the turn to turn voltages or the expected turn to turn voltage surges are exceptionally high.
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Kincaid Kristine L.
Machtinger Marc D.
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