Compare Contamination Discharge AE with Corona Discharge AE

In order to know discharge type exactly, contamination discharge AE and corona AE of insulator are compared by experiments. Increase test voltage and vary work condition, at the same time, measure and record AE wave from contamination discharge and corona discharge, then the varying laws of AE with test voltage and with test time during the two discharges are analyzed and compared. Experiment result shows that corona discharge AE and contamination discharge AE can be both detected by AE sensor, and they appear both in periodicity and in axial symmetry in test voltage period. However, there are some obvious differences in the two discharges, such as AE event count in a test period, AE start voltage, test voltage stability, test time stability and AE's shape. So applying the differences to identify the discharge type of insulator should be effective and feasible.