Effect of temperature on space charge characteristics in epoxy resin
Effect of temperature on space charge characteristics in epoxy resin
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DOI：
10.1109/tdei.2014.004518
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发表时间：
2015-02
影响因子：
3.1
通讯作者：
Peng Liu;X. Ning;Zongren Peng;Z. Xiang;Hua Feng;Hongliang Zhang
中科院分区：
文献类型：
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作者：
Peng Liu;X. Ning;Zongren Peng;Z. Xiang;Hua Feng;Hongliang Zhang
环氧树脂已被广泛用作高压直流套管的干式绝缘材料。在额定功率流下工作时，中心导线的温度可高达90-105°C。因此，由环氧树脂制成的内绝缘材料可以承受这些高温。为了研究温度对环氧树脂介电性能的影响，用改进的脉冲电声装置研究了不同温度(21、40、60、80和100℃)下环氧树脂的空间电荷特性。此外，还测量了体电阻率与温度的关系。在所有的测试中，只能发现接近电极的同电荷电。温度越高，大部分样品中的电场变形越严重。随着温度的升高，空间电荷积累的阈值显著降低。表观陷阱控制的电荷迁移率和直流电导率都表现出相似的正温度依赖关系，并随着温度的升高而增加，导致不同温度下的电荷衰减特性不同。还得到了不同温度下的表观陷阱深度。
Epoxy resin has been widely used as the dry-type insulation in high voltage direct current bushing. The temperature of the central conductor can go up to 90-105°C when working at the rated power flow. Thus, the inner insulation made of epoxy resin sustains these high temperatures. In order to study the effect of temperature on the dielectric performance, the space charge characteristics of epoxy resin at different temperatures (21, 40, 60, 80 and 100°C) have been studied with an improved pulsed electro-acoustic set-up. Moreover, the temperature dependence of the volume resistivity has also been measured. Only homocharge close to the electrodes can be found in all tests. The higher the temperature, the more serious the electric field distortion is in the bulk of a sample. The threshold for space charge accumulation decreases remarkably with increasing temperature. Both the apparent trap-controlled charge mobility and the dc conductivity show similar positive temperature dependence, which increases with the elevation of temperature, resulting in different charge decay characteristics at different temperatures. The apparent trap depths corresponding to different temperatures have also been obtained.