Surface flashover character of insulator in vacuum under self-magnetic field
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摘要: 基于磁场闪络抑制原理，研究回路电流产生的自磁场效应对固体材料绝缘性能的影响。通过计算电场强度与磁感应强度的临界比值，设计了同轴电极结构，确定了满足闪络抑制判据的电极尺寸，开展自磁场闪络抑制实验、自磁场闪络促进实验以及无磁场绝缘闪络实验，对比三种条件下绝缘材料的沿面闪络规律，分析磁场位形对材料绝缘特性的影响情况。实验结果表明:绝缘样品在自磁场闪络抑制效应影响下闪络电压提高了约15%，在自磁场促进闪络效应下闪络电压降低了约18%。Abstract: The surface flashover character of insulator in vacuum under self-magnetic field is investigated in this paper through the principle of magnetic flashover inhibition (MFI). Considering the calculation of the critical ratio between electric and magnetic field, a coaxial electrode was designed to carry out experiments under three different conditions: the self-magnetic field flashover inhibition, the self-magnetic field flashover acceleration and none magnetic field. The results show that the insulator surface flashover voltage is improved about 15% with the self-magnetic field flashover inhibition and is reduced about 18% with the self-magnetic field flashover enhancement compared with that without magnetic field.
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Key words:
- insulator /
- surface flashover /
- self-magnetic flashover inhibition /
- circuit current
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