SF<sub>6</sub>中氧化铝环氧复合材料的纳秒脉冲闪络特性

孙楚昱; 王海洋; 谢霖燊; 迟晓红

doi:10.11884/HPLPB202133.200289

SF₆中氧化铝环氧复合材料的纳秒脉冲闪络特性

doi: 10.11884/HPLPB202133.200289

1.
西北核技术研究所强脉冲辐射模拟与效应国家重点实验室，西安 710024
2.
西安交通大学电力设备电气绝缘国家重点实验室，西安 710049

基金项目: 强脉冲辐射环境模拟与效应国家重点实验室基金项目（SKLIPR1901Z）

详细信息

作者简介:
孙楚昱（1992—），女，硕士，助理研究员，从事脉冲功率及高电压绝缘研究

中图分类号: TM85
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出版历程
- 收稿日期: 2020-10-19
- 修回日期: 2021-03-17
- 网络出版日期: 2021-04-12
- 刊出日期: 2021-05-20

Flashover characteristics of epoxy/Al₂O₃ composite under nanosecond rising pulses in SF₆ gas

1.
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, China
2.
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China

摘要

摘要: 氧化铝掺杂环氧树脂复合材料在电力绝缘设备中应用广泛，然而人们对其在纳秒脉冲下的绝缘性能研究较少，这限制了它在指导脉冲功率装置中的应用。为探究其在纳秒脉冲下的沿面绝缘性能，对氧化铝掺杂环氧树脂复合材料在前沿数十ns快脉冲电压下的闪络特性进行了研究，结果显示，其闪络电场较纯环氧有较大提高，闪络电压符合韦伯分布。实验表明，闪络电压随电压上升率的增加而显著增加，从5.8 kV/ns时的108 kV上升到20.5 kV/ns时的226 kV，增幅超过1倍。闪络时延随电压上升率的上升呈现“先快速下降、后趋于平缓”的趋势。在试样闪络通道表面观测到明显的碳化现象，说明实验中的闪络放电对复合材料有破坏性影响。
- 脉冲功率 /
- 环氧树脂 /
- 快脉冲 /
- 沿面绝缘 /
- 沿面闪络
Abstract: Epoxy/Al₂O₃ composite is widely used as insulating material in power equipment. However, its performance in SF₆ gas under fast-rising pulse is little studied, which limits its application in guiding insulation design of pulse power devices. To investigate the insulation characteristics of epoxy/Al₂O₃ composite under nanosecond pulses, the flashover characteristics of this material are studied under pulse voltage with rise time of about 52 ns. The results show that its electric field of flashover is much higher than pure epoxy’s, and the flashover voltage is in accordance with Weibull distribution. The experiment shows that the flashover voltage increases significantly with the increase of the pulse steepness, from 108 kV at 5.8 kV/ns to 226 kV at 20.5 kV/ns. As pulse steepness increases, the flashover delay time decreases rapidly first, then tends to be flat. The surface morphology of the flashover area of the samples shows that the flashover channel is obviously carbonized and flashover discharge has a destructive effect on the composite material.
- pulse power /
- epoxy resin /
- fast pulse /
- surface insulation /
- surface flashover

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图 1 实验系统整体示意图

Figure 1. Schematic of experiment setup

下载: 全尺寸图片幻灯片

图 2 典型未闪络波形及不同电压上升率的闪络波形

Figure 2. Typical unflashover voltage waveform and flashover waveforms with different pulse steepness

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图 3 韦伯分布图

Figure 3. Weibull probability plot

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图 4 闪络电压和闪络时延与电压上升率的关系

Figure 4. Relationship of flashover voltage, time delay and pulse steepness

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图 5 试样照片及闪络区域SEM图像

Figure 5. Pictures of samples and SEM image of surface after flashover

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表 1 累积概率函数

Table 1. Accumulative frequency

flashover voltage/kV	flashover amount	accumulated amount	F（V）
81−85	1	1	0.0133
86−90	1	2	0.0267
91−95	2	4	0.0533
96−100	11	15	0.2000
101−105	24	39	0.5200
106−110	14	53	0.7067
111−115	10	63	0.8400
116−120	8	71	0.9467
121−125	2	73	0.9733
126−130	1	74	0.9867
131−135	1	75	1

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表 2 部分纯环氧材料闪络场强对比

Table 2. Comparison with flashover electric field of pure epoxy

source	material	electrode	flashover electric field/（kV·cm⁻¹）	pulse rise time/（ns）	SF₆ pressure/（MPa）
this paper	epoxy/Al₂O₃ composite	finger	224	52	0.2
ref.[19]	epoxy resin	finger	113	100	0.2
ref.[20]	epoxy resin	finger	55	20	0.2
ref.[21]	epoxy resin	finger	43	not mentioned	0.2

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