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An Acoustic Emission Method for On-line Monitoring the Contamination-causing Flashover of Insulator C. M. Pei, N. Q. Shu, L. Li, D. Wang and Z. P. Li School of Electric Engineering, Wuhan University, 430072, China Abstract- This paper presents an acoustic emission (AE) current measurement usually requires reconstructing insulators monitoring method. When a partial discharge occurs, there is an in order to install highly specialized current transducers, which instantaneous release of energy, some of which is emitted as must often be designed into the monitoring apparatus, and this acoustic energy. The pollution severities of insulators in-service extends the apparatus purchase. In field monitoring, acoustic can be monitored and accordingly threaten to the insulation of methods are more applicable than electrical methods in virtue of power grid is evaluated by detecting the sound signals. To prove the immunity to electromagnetic noise and simple this AE monitoring method, artificial contaminations experiments instrumentation; hence acoustic methods can be effectively used are carried out. The essential information about the relationship of at site conditions for on-line contamination monitoring of AE signal and PD are obtained in different moments of the whole insulators. process of flashover. The studied method is a new way of AE A lot of acoustic discharge detection knowledge has been technique in monitoring and characterizing defects of electrical accumulated and developed in a long period. In the previous