| ZnO压敏电阻器用电气绝缘粉末固化物吸水特性的研究 |
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| 引用本文： | 李盛涛,梁磊,刘念杰.ZnO压敏电阻器用电气绝缘粉末固化物吸水特性的研究[J].电瓷避雷器,2004(3):25-28. |
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| 作者姓名： | 李盛涛 梁磊 刘念杰 |
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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,陕西,西安,710049;陕西华电材料总公司伟华电子封装材料厂,陕西,咸阳,712099 |
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| 摘 要： | ZnO压敏电阻器的耐湿热劣化性能主要决定于电气绝缘粉末固化物的吸水特性和透水特性,研究了电气绝缘粉末固化物在恒温恒湿条件下的吸水规律,指出其初期符合费克第二定律,经过一定受潮时间后趋于饱和。实验表明,吸水后介电常数和介质损耗角正切增大,国外和部分国产试样吸水后高频区和低频区的介电常数和介质损耗角正切基本同步增加,但是另一部分国产试样低频区的介质损耗角正切增长幅度大于高频区,这可能是水分子引起的可动离子造成的离子电导所致。
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| 关 键 词： | ZnO压敏电阻器:电气绝缘粉末固化物 吸水特性 |
| 文章编号： | 1003-8337(2004)03-0025-04 |
| 修稿时间： | 2004年2月4日 |
The Water-absorbing Characteristics of Epoxy Coating Used ZnO on Varistors |
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| LI Sheng-tao,LIANG Lei,LIU Nian-jie r Power Equipment,Xi'an Jiaotong University,Xi'an China,.Wei Hua Electricity Package Material Factory,Hua Dian Material Corp of Shannxi,Xianyang ,China.The Water-absorbing Characteristics of Epoxy Coating Used ZnO on Varistors[J].Insulators and Surge Arresters,2004(3):25-28. |
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| Authors: | LI Sheng-tao LIANG Lei LIU Nian-jie r Power Equipment Xi'an Jiaotong University Xi'an China Wei Hua Electricity Package Material Factory Hua Dian Material Corp of Shannxi Xianyang China |
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| Affiliation: | LI Sheng-tao~1,LIANG Lei~1,LIU Nian-jie~2 r Power Equipment,Xi'an Jiaotong University,Xi'an 710049 China,2.Wei Hua Electricity Package Material Factory,Hua Dian Material Corp of Shannxi,Xianyang 712099,China) |
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| Abstract: | The ageing behaviour of ZnO varistors under humid-thermal conditions is chiefly determined by the water absorbability and water permeability of electrical insulating epoxy coating.It is found that the water absorption in hardened electrical insulating epoxy coating agrees with the second law of Fick in early stage,and tends to be saturated after a certain time. Comparing the different dielectric properties of samples when they were dry and determined before and after water absorption.It is found that permittivity and dissipation factor increase after they absorbed water.Permittivity and dissipation factor of foreign-made samples and some domestic samples inceraes at a same rate in high frequency range and low frequency range,whereas increased magnitude of dissipation factor of some domestic samples is greater in low frequency range than that in high frequency range.It may be caused by ionic conductance of mobile initiated by water molecule inside the samples. |
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| Keywords: | ZnO varistors electrical insulation solidified powder water absorbability |
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