The on-line partial discharge testing has been used to provide useful information to diagnose and monitor the integrity of stator winding insulation of hydrogenerators. We are aiming for the establishment of a method of on-line diagnosis of insulation deterioration on hydrogenerator stator winding by acoustic emission (AE) detection method. We have developed a new AE measuring system that is controlled by output signal of hydrogenerator. In this paper, it was clarified that the insulation deterioration of hydrogenerator stator winding depended remarkably on the temperature of stator winding during a starting operation period.
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