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Partial discharge (PD) measurement on power transformers has become an established approach for transformer insulation diagnostics. Acoustic measurement can be used to detect PD in power transformers. With this technique a detection and localization of PD is possible by placing acoustic sensors on transformer tank surfaces. One advantage of this acoustic approach is it is less subject to electrical...
The winding hot-spot temperature is an extremely important factor limiting the loading capability of a power transformer. High temperature also accelerates the aging of paper insulation and thus reduces the lifetime of a transformer. Ohmic losses in the winding are the main source of heat inside a transformer. Precise knowledge of these losses is very important to determine the winding temperature...
Water slowly accumulates in transformers through various mechanisms, e.g., slow decomposition of paper insulation, contact between humid air and oil in a free-breathing conservator, and penetration through degraded sealing and absorption when the transformer is opened for maintenance [1].
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