Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance
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摘要: 为了分析不同盐密值下污秽绝缘子并联间隙的雷电冲击击穿特性，以SC-210瓷横担绝缘子为例进行雷电冲击试验，通过对比清洁和污秽绝缘子的电场仿真结果，对试验时多次发生沿绝缘子表面闪络的现象进行了分析. 试验和分析表明：安装并联间隙的SC-210瓷横担，其雷电冲击击穿电压U50%随盐密值增加而降低，更容易趋于饱和；污秽绝缘子与防雷间隙的雷电冲击伏秒特性曲线逐渐相交，试验时多次发生沿绝缘子表面闪络的现象. 研究结果建议在进行并联间隙与绝缘子串的绝缘配合整定时，应考虑绝缘子表面污秽对闪络/击穿部位的影响.Abstract: To analyse the lightning impulse breakdown characteristics of the parallel gaps of contaminated insulators with different salt densities, the SC-210 porcelain cross-arm insulator was used to conduct the lightning impulse test. Comparing with the electric field simulation results of the clean and contaminated insulators, the phenomenon of flashover along the surface of the insulator was analysed several times during the test. The tests and analysis indicate that in case of the SC-210 porcelain cross-arm installed with parallel gaps, its lightning impulse breakdown voltage U50% decreases with increasing salt density and tends to saturate more readily. The voltage-time characteristics curve of the lightning impulse of the contaminated insulator and the lightning protection gap gradually intersect, and the phenomenon of flashover along the surface of the insulator occurs several times during the test. The results of the study suggest that the effect of contamination on the flashover/breakdown location on the surface of the insulator should be considered in the insulation timing of the parallel gap and the insulator string.
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图 1 不同距离下雷电冲击击穿电压的伏秒特性曲线
Figure 1. Contrast of voltage-time characteristics for different distances
图 3 不同污秽程度和间隙距离的U50%分布
Figure 3. Diagram of U50% distribution for different contaminated levels and gap distances
图 4 不同盐密值下SC-210瓷横担伏秒特性曲线
Figure 4. Voltage-time characteristics curves of SC-210 porcelain cross-arm under different salt densities
图 5 不同盐密值下绝缘子并联间隙伏秒特性曲线
Figure 5. Voltage-time characteristics curves of parallel gap of insulator under different salt densities levels
图 6 绝缘子表面径向方向的电场强度曲线
Figure 6. Electric field intensity curve of radial direction along surface of insulator
表 1 不同盐密值情况下改变间隙距离试验的电弧闪络/击穿位置对比
Table 1. Contrast of flashover arc position when changing distance of parallel gap under different salt densities
盐密值/（mg•cm–2） 距离 31.5 29.9 28.3 26.7 0.01 13/7 13/7 15/5 20/0 0.03 11/9 13/7 14/6 19/1 0.07 5/15 7/13 6/14 9/11 0.12 2/18 3/17 2/18 4/16 
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