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PD-source localization in a complicated multi-material insulating system like that of a power transformer is still a challenge for all testing engineers. Additionally to the measurement of apparent charge with a conventional PD-system (according to the Standards), detection of acoustical PD-signals can be used to localize the PD-source. In many cases however, especially for PD-sources hidden in the...
This paper describes the first results from experimental investigations which have been carried out to study the partial discharge phenomena in power transformer insulation. Using different types of modeled insulation defects and ageing tests it is aimed to organize a database of known defects, which will be used for recognition of discharges of unknown sources of defects. Moreover, the first results...
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