Influence of GPO-3 Barrier on AC Breakdown Voltage of Rod-Plane Gaps and Surface Residual Charge Characteristics
Zan Haibin1, Li Guochang2,3, Wang Jingbing1, Wei Yanhui2
1. CRRC Qingdao SiFang Rolling Stock Research Institute Co. Ltd Qingdao 266031 China; 2. Institute of Advanced Electrical Materials Qingdao University of Science and Technology Qingdao 266042 China; 3. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China;
Abstract The insulation performance of the whole system can be greatly improved by introducing the insulation barrier. The effects of size, position and thickness of insulation barrier on ac breakdown voltage were studied. Furthermore, the surface residual charge properties on the barrier after discharge were measured by non-contact surface potentiometer. The experimental results indicate that the breakdown voltage of the system increases up to 1.91 times. When the thickness exceeds about 6mm, the increase of breakdown voltage is not obvious. Obvious residual charges can be observed on the barrier after breakdown, while the surface potential of GPO-3 reaches 3 856V after breakdown and reduces to 239V after 1h. The peak density of surface charges on GPO-3 are 1.59×1019/m3 and 8.87×1018/m3 respectively, and the trap level is about 1.0eV. This paper can provide a reference for the design of the insulation barrier.
Zan Haibin,Li Guochang,Wang Jingbing等. Influence of GPO-3 Barrier on AC Breakdown Voltage of Rod-Plane Gaps and Surface Residual Charge Characteristics[J]. Transactions of China Electrotechnical Society, 2020, 35(8): 1799-1806.
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2020, Vol. 35 
