| 冷却介质对低密度聚乙烯电树枝老化特性的影响 |
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| 引用本文： | 李剑,梁勇,杨丽君,章华中,赵玉顺.冷却介质对低密度聚乙烯电树枝老化特性的影响[J].高电压技术,2010,36(3):578-583. |
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| 作者姓名： | 李剑 梁勇 杨丽君 章华中 赵玉顺 |
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| 作者单位： | 重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆,400044 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)(2009CB724508)~~ |
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| 摘 要： | 低密度聚乙烯是电力电缆的主要绝缘材料,电树枝生长特性分析是评估电缆绝缘性能的基础。为此选用冰水、空气和硅油3种不同介质对聚乙烯进行淬火处理,采用针板电极设计出试样的电树枝生长实验系统,通过实时数字显微摄像系统对试样中电树枝生长过程进行了观测,采用差示扫描量热法分析了试样的结晶度和晶粒尺寸均匀性,采集了试样的局部放电数据并对数据进行了统计分析。试验与分析结果表明:硅油冷却聚乙烯电树枝增长速度与扩散系数均小于冰水、空气冷却试样;3种试样中,硅油冷却聚乙烯结晶度最高,晶粒尺寸分布最均匀,放电量与放电重复率较低;冰水冷却聚乙烯结晶度最低,放电量与放电重复率较高。
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| 关 键 词： | 低密度聚乙烯 冷却介质 电树枝 生长特性 结晶状态 局部放电 |
Influence of Cooling Medium on Electrical Tree Growing Properties of LDPE |
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| LI Jian
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LIANG Yong
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YANG Li-jun
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ZHANG Hua-zhong
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ZHAO Yu-shun.Influence of Cooling Medium on Electrical Tree Growing Properties of LDPE[J].High Voltage Engineering,2010,36(3):578-583. |
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| Authors: | LI Jian LIANG Yong YANG Li-jun ZHANG Hua-zhong ZHAO Yu-shun |
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| Affiliation: | State Key Laboratory of Power Transmission Equipment & System Security and New Technology;Chongqing University;Chongqing 400044;China |
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| Abstract: | Low density polyethylene(LDPE) is a major type of insulation materials of power cables.Analysis of electrical tree growing properties in LDPE is the basis to evaluate insulation performances of such type of material.LDPE specimens used for electrical tree experiments were made through being cooled in ice water,air,and silicone oil.An experiment system of electrical tree growth was designed on the base of a needle-plate electrode.Electrical tree growing processes were observed by using a living microscope ca... |
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| Keywords: | low density polyethylene cooling medium electrical tree propagation characteristics crystallinity state partial discharge |
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