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Bubble formation from paper insulation during overload is important to understand because it can cause a transformer to fail. This phenomenon has been investigated in a mineral oil-paper system, but not in vegetable oil. This study investigated bubble formation during overload in a vegetable oil impregnated paper system and the results were compared to a mineral oil (Shell Diala B) which was studied...
Various research groups have demonstrated that Kraft paper insulation degrades slower in vegetable oil than in the commonly used mineral oil. This has been proposed as being beneficial to the utilities because their transformers may either last longer, or they can be run at higher load. However, a mode of failure that is frequently ignored is the inception temperature when water bubbles form on the...
Voltage regulators were originally implemented as a cost effective means of improving power quality on network spurs where embedded generation was not considered economically or technically feasible. Their main function in maintaining local network stability is achieved by way of increasing voltage during periods of short-time over-loading and reducing voltage during periods of load shedding. This...
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