Estimation of Position of On-line Partial Discharge on Hydrogenerator Stator Windings using Acoustic Emission Detection Techniques

抄録

Establishment of Condition Based Maintenance (CBM) for hydrogenerator is very important for monitoring the insulation of stator windings. The partial discharge (PD) testing is a promising method of stator winding insulation of hydrogenerator conditions monitoring. Therefore, the on-line PD testing has been used to provide useful information to diagnose and monitor the integrity of stator winding insulation of many hydrogenerators. In this paper, we estimated an occurrence position of on-line maximum PD on hydrogenerator stator winding using acoustic emission (AE) detection techniques. Additionally, the PD is dramatically influenced by elements of driving condition on hydrogenerator, which are coil temperature, humidity, output power and stator room temperature. Consequently, we investigated characteristics of PD for various driving condition by means of measuring AE produced by PD at the same time. Especially, we reported characteristics of partial discharge versus humidity that dramatically influenced characteristics of PD.