Method for controlling heating and cooling in segments at a fiber glass bushing
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United States of America Patent
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Jul 28, 1998
Issued Date -
N/A
app pub date -
Oct 16, 1996
filing date -
Oct 12, 1994
priority date (Note) -
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Abstract
A supplemental controller for a fiber glass bushing actively performs heating and cooling of a connected segment of the bushing which is otherwise controlled by a primary controller. In one embodiment, the supplemental controller performs heating by means of current injection into a connected bushing segment and cooling by means of current diversion from or around the connected bushing segment. Initial start-up and balancing operations can be performed without activation of the supplemental controller. In another embodiment of the invention, the supplemental controller heats a bushing segment by injecting current in-phase with current from the primary bushing controller and cools the bushing segment by injecting current out-of-phase with current from the primary bushing controller.
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