Abstract
On-line insulation monitoring of transformer and the fault diagnosis are effective means to avoid sudden accidents happening on the transformer, which are necessary to perform the condition based maintenance (CBM) of transformer. Partial discharge is often accompanied by the external signals of sound, light and electricity as well as some detectable physical phenomena such as characteristic gas and dielectric loss. The partial discharge defects inside the transformer can be found by detecting the external signals. The principle of electro-acoustic monitoring, its monitoring systems and the related judgment technologies are expounded, on the basis of which an outline design of the monitoring system is presented.
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