Breakdown characteristics of oil-impregnated paper with different parameters of high-voltage pulse
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摘要: 配电变压器在高空电磁脉冲(high-altitude electromagnetic pulse,HEMP)的传导环境下会受到纳秒电应力的入侵,易造成绕组引线间的绝缘失效或损伤。为此,本文以变压器绕组模型为基础,研究以不同半高宽和上升沿的纳秒脉冲电压对油浸纸的伏秒特性、击穿概率、脉冲电压幅值与累积耐受次数间的关系(即U-N特性),并采用Weibull分布函数对数据结果进行拟合。统计试验结果发现不同电压参数对伏秒特性和击穿概率的影响较为明显,在同一击穿概率下,所需要的击穿电压随着半高宽的增加而降低,随着上升沿的增加而增加。观察试验后的波形图得出:油浸纸波头击穿概率随半高宽的增加而降低,随着上升沿的增加而增加,从而导致击穿概率与伏秒特性随之变化,而U-N特性的改变受电压幅值大小的影响较大,电压参数改变的影响较小。
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关键词:
- 配电变压器 /
- 纳秒脉冲 /
- 半高宽和上升沿 /
- Weibull分布函数 /
- 击穿特性
Abstract:Background Distribution transformers in the high altitude electromagnetic pulse (HEMP) conduction environment are subjected to nanosecond electrical stress, which can easily cause insulation failure or damage between the winding leads.Purpose This paper takes the transformer winding model as the basis to study the relationship between the volt-second characteristics of oil-immersed paper, breakdown probability, pulse voltage amplitude, and cumulative number of withstand times with different half-height widths and rising edge of the nanosecond voltage pulses (U-N characteristics) .Methods Modify the circuit components to alter the output voltage’s half-width and rise time, thereby investigating the impact of these changes on the breakdown characteristics of oil-immersed paper. Apply the Weibull distribution function to fit and analyze the resulting data.Result When the fixed rising edge is 20 ns, the breakdown voltage decreases as the half-height width increases; when the fixed half-height width is 500 ns, the breakdown voltage increases as the rising edge increases.Conclusions The effects of different voltage parameters on the volt-second characteristics and breakdown probability are more obvious, and it is found that the probability of breakdown of oil immersed paper wave head decreases with the increase of full width at half maximum, and increases with the increase of rising edge, resulting in changes in breakdown probability and volt-second characteristics. The change in U-N characteristics is more affected by the magnitude of voltage amplitude, and less affected by changes in voltage characteristic parameters. -
表 1 波头击穿占比
Table 1. Percentage of the breakdown at wave head
rising edge/ns full width at half
maximum/nspercentage/% 20 100 80.28 20 300 76.05 20 500 72.3 20 700 69.01 20 900 67.6 5 500 69.01 10 500 70.42 50 500 73.23 100 500 76.05 表 2 U-N特性拟合数据
Table 2. Fitting parameters for U-N characteristics
rising edge/ns full width at half
maximum/nsK A U0 U0 probability of
penetration/%20 100 18.59 0.02 16.66 3.9 20 300 16.48 0.02 14.78 3.9 20 500 16.17 0.025 13.99 3.8 20 700 14.51 0.024 13.5 4 20 900 13.7 0.027 12.89 4.3 5 500 13.4 0.031 19.6 3.5 10 500 15.7 0.03 16.75 4.3 50 500 17.9 0.022 12.57 3.2 100 500 19.33 0.019 11.31 4.4 -
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