Simultaneous measurement of Electroluminescence and dissipation current in cable insulation
Simultaneous measurement of Electroluminescence and dissipation current in cable insulation
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同时测量电缆绝缘中的电致发光和耗散电流
DOI：
10.1109/icpadm.2003.1218603
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Bulinski
中科院分区：
文献类型：
--
作者：
K. Tohyama;S. Bamji;A. Bulinski
聚合物材料广泛应用于电容器、电缆、变压器等高压设备中。电致发光(EL)是高电应力下绝缘材料中的光发射，已知发生在局部放电开始之前很久。EL发射与聚合物绝缘中空间电荷的存在有关。在高交流电场下，从电极注入到绝缘中的电荷占主导地位，损耗电流变为非线性。本文介绍了均匀交变电场作用下LDPE中EL发射和损耗电流的同时测量。结果表明，在EL发射开始时，耗散电流波形偏离了正弦特性，开始出现谐波。耗散电流的谐波失真的增加可能表明交流传导机制的改变。
Polymeric materials are widely used in high voltage devices such as capacitors, cables and transformers. Electroluminescence (EL), the emission of light in insulating materials subjected to high electric stress, is known to occur much before partial discharge inception. EL emission has been linked to the presence of space charge in the polymeric insulation. At high ac fields, charge injection from the electrodes into the insulation becomes dominant and the dissipation current becomes nonlinear. This paper describes the simultaneous measurement of EL emission and dissipation current in LDPE subjected to uniform ac field. It is shown that at the onset of EL emission the dissipation current waveform deviates from its sinusoidal characteristics and starts to show harmonics. The increase in the harmonic distortion of the dissipation current could indicate a change in the ac conduction mechanism.