Study of Fundamental Characteristic in Electrical Insulation Using Paper-Ice Composite Insulating System for High Temperature Superconducting Power Cable

高温超导电力电缆的研究工作为解决电力增量问题而取得了进展。选用何种绝缘材料对超导电力电缆的实际应用具有重要意义。研究了一种以绝缘纸ln_2为材料的复合绝缘系统。然而，在传统的纸-液氮绝缘系统中，纸张内部存在微气泡，容易发生局部放电。为了解决这一问题，我们发明了纸冰复合绝缘系统来替代纸ln_2在低温电绝缘系统中的应用。结果表明，多层纸-冰复合绝缘系统的击穿强度高于多层纸- ln_2复合绝缘系统。与纸- ln_2复合绝缘系统相比，纸-冰复合绝缘系统的模拟量较小。研究了导电异物对纸冰复合绝缘系统的击穿特性等的影响。含有金属夹杂物的of - a纸的击穿强度高于含有金属夹杂物的of - a纸的击穿强度，而含有金属夹杂物的of - a纸的击穿强度与不含金属夹杂物的of - a纸的击穿强度相同。在寿命试验中，发现含金属夹杂的纸冰复合保温系统的寿命低于不含金属夹杂的纸冰复合保温系统，而含金属夹杂的纸冰复合保温系统的寿命几乎没有降低。研究还表明，即使纸冰复合绝缘系统中存在金属夹杂物，在3倍局部放电电场作用下，该系统的寿命也优于含或不含金属夹杂物的纸-LN2复合绝缘系统。少

The research work for high temperature superconducting power cable has advanced to deal with increment of electric power. It is important that what is elected as insulating materials for the practical application of superconducting power cable. A composite insulating system made of insulating paper-LN_2 has been studied as one of the insulating system. However, in paper-liquid nitrogen (LN_2) insulating system using conventional techniques, micro bubbles remain inside the paper and the partial discharge could occur easily. To overcome this problem, we invented the paper-ice composite insulation system as a substitute for paper-LN_2 at cryogenic electric insulating system. We found that the electric breakdown strength of multi paper layer-ice composite insulation system was higher than that of the multi paper layer-LN_2 composite insulation system. It is also reported that the decreasing rate of breakdown strength occurred by conducting foreign particles with the paper-ice composite ins … More ulation system is small compared with that of the paper-LN_2 composite insulation system. In this research, the electric breakdown characteristics etc of the paper-ice composite insulating system influenced by the conducting foreign particles were investigated.The breakdown strength of OF-paper B with the metallic inclusion was higher than that of OF-A which has lower paper density in the same manner as that without the metallic inclusion. In lifetime test, it was recognized that the lifetime of the paper-ice composite insulation system with the metallic inclusion was inferior to that without the metallic inclusion while the lifetime showed almost no reduction in the paper-LN_2 composite insulation system. It was also cleared that even if the metallic inclusion existed in the paper-ice composite insulation system, the lifetime of that system under the electric field of 3 times for the partial discharge was previously excellent to that of the in the paper -LN2 composite insulation system with or without metallic inclusion. Less