| 温度梯度场对电声脉冲法空间电荷测量波形的影响 |
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| 引用本文： | 陈曦,王霞,吴锴,彭宗仁,成永红.温度梯度场对电声脉冲法空间电荷测量波形的影响[J].物理学报,2010,59(10):7327-7332. |
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| 作者姓名： | 陈曦 王霞 吴锴 彭宗仁 成永红 |
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| 作者单位： | 西安交通大学,电力设备电气绝缘国家重点实验室,西安710049 |
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| 基金项目： | 国家自然科学基金(批准号:50907050)和高等学校科技创新工程重大项目培育基金(批准号:707053) 资助的课题. |
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| 摘 要： | 电力设备运行中的温升现象严重影响绝缘的使用寿命,因此高温下的空间电荷测量引起了许多学者的关注.但温度升高时,聚合物材料的声阻抗、Young模量、密度、声波在其中传播的速度、衰减特性均发生变化,因此无法准确测量出介质中的空间电荷特性.而对于温度梯度场下的绝缘介质(如电缆发热场)的空间电荷测量,温度的梯度分布对介质的声阻抗、弹性模量、密度、声速及声波衰减的影响将更为复杂.本文基于电声脉冲测量方法中声波的传播特性和温度对聚乙烯材料特性的影响,分析了温度梯度场对空间电荷测量结果的影响并进行了波形恢复.
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| 关 键 词： | 温度梯度 聚乙烯 空间电荷 校正 |
| 收稿时间： | 2009-12-24 |
Effect of temperature gradient on space charge waveform in pulsed electroacoustic method |
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| Chen Xi,Wang Xia,Wu Kai,Peng Zong-Ren,Cheng Yong-Hong.Effect of temperature gradient on space charge waveform in pulsed electroacoustic method[J].Acta Physica Sinica,2010,59(10):7327-7332. |
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| Authors: | Chen Xi Wang Xia Wu Kai Peng Zong-Ren Cheng Yong-Hong |
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| Affiliation: | State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | Temperature rise of power equipment in service serionsly affect the lifetime of insulation, so many researchers have focused on space charge measurements at high temperature. But the changes of polymeric properties (e.g. sound impedance, Young’s modulus, density, velocity of sound wave, decay characteristic etc.) at high temperature make measurement of space charge profiles in polymer inaccurate. What is more, the changes of polymeric properties are more complex under temperature gradient. In this paper, based on the propagation characteristic of sound wave in pulsed electroacoustic method and temperature dependence of polyethylene properties, the effect of temperature gradient on space charge measurement is analyzed and the space charge waveform is recovered. |
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| Keywords: | temperature gradient polyethylene space charge recovery |
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