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| The Phenomena and Characteristics of Oil-Paper Insulation Surface Discharge Under AC and DC Voltage |
| Qi Bo1,2, Wei Zhen3, Li Chengrong1,2, Yuan Qing2, Gao Yi2, Zhang Xiaohan2 |
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. Beijing Key Laboratory of High Voltage & EMC North China Electric Power University Beijing 102206 China;
3. State Grid Qingdao Power Supply Company of Shandong Power Company Qingdao 266002 China |
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Abstract Surface discharge in oil-paper insulation is a common defect in converter transformer. Because of the complex operation conditions in converter transformer, the occurrence likelihood of surface discharge increases. It is important to understand the phenomena and characteristics of surface discharge in oil-paper insulation for fault diagnosis of converter transformer. But the electric field in converter transformer is AC-DC combined electric field, which is quite different from AC voltage. So this article built an oil-paper insulation surface partial discharge detection platform under AC-DC combined voltage, and then analyzed the trend of partial discharge characteristics, at last divided the severity classification according to the characteristics of discharge and dissolved gas analysis (DGA). The diagnosis method under AC voltage has certain applicability under AC-DC combined voltage. These characteristics on partial discharge and DGA could be the foundations of fault diagnosis for converter transformer.
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Received: 25 August 2014
Published: 11 July 2016
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2016, Vol. 31 
