MANUFACTURE OF THE SAMPLE OBSERVING ELECTROLUMINESCENCE PHENOMENA OF POLYMERIC INSULATING FILM UNDER UNIFORM HIGH ELECTRIC FIELD

聚合物绝缘体广泛应用于电容器、电缆、变压器等高压器件中。电致发光（EL）是绝缘材料在高电应力作用下发出的光，在局部放电开始之前就已经发生了。电致发光与聚合物绝缘体中的空间电荷区有关。在高交流磁场下，电极向绝缘中的电荷注入成为主导，并且由于绝缘中的空间电荷，耗散电流变为非线性。在本研究中，为了同时测量EL发射和耗散电流，研制了在均匀高电场下观测这些现象的样品。利用该样品，进行了同步测量。实验结果表明，在电致发光开始时，耗散电流波形偏离其正弦特性，开始出现谐波。耗散三次谐波的增加可能表明传导机制发生了变化。

Polymeric insulators are widely used in high voltage devices such as capacitors, cables and transformers. Electroluminescence (EL), the emission of light in insulation materials subjected to high electric stress, is known to occur much before partial discharge inception. EL emission has been linked to the space charge region in the polymeric insulation. At high ac fields, charge injection from the electrodes into the insulation becomes dominant and the dissipation current becomes nonlinear due to the space charge in the insulation. In this research, in order to carry out the simultaneous measurement of EL emission and dissipation current, the sample for observing these phenomena under uniform high electric filed has been developed. By using this sample, simultaneous measurement has been carried out. As results of these experiments, it was found 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 third harmonic of the dissipation could indicate a change in the conduction mechanism.