Development and pattern identification of end-winding discharge under effect of relative humidity and temperature for HV motors

Autor: Ailiang Kang, Muqin Tian, Chuanyang Li, Jiancheng Song, Simone Vincenzo Suraci, Wei Li, Lingyan Lin, Zhipeng Lei, Davide Fabiani
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: High Voltage (2020)
Druh dokumentu: article
ISSN: 2397-7264
DOI: 10.1049/hve.2019.0124
Popis: During operation of high voltage (HV) motors, different types of discharges, e.g. surface discharge, corona discharge and bar-to-bar discharge can occur at the same time, increasing the difficulty of partial discharge (PD) sources determination and PDs pattern identification. In this study, the end-winding of a 10 kV motor coil was artificially aged and the related PD was measured. The initiation and variation of different PDs under multi-factor stresses were studied. The localised fingerprints coexisting with multiple PDs were identified and analysed. The results confirm that the end-winding discharge process was significantly influenced by the experiment relative humidity (RH) and temperature. The bar-to-bar discharge was easily recognised at a lower voltage since the identification of bar-to-bar discharge pattern would be affected by the corona discharge pattern at a higher voltage. It is shown that it is more difficult for the corona discharge to be detected when RH exceeded 80%, while the surface discharge dominated at the higher RH. In addition, the PDs were more easily identified with the rise of the temperature. This study can provide a reference in PD identification test and be useful for the PD online monitoring of HV motors.
Databáze: Directory of Open Access Journals
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