抄録
The recent trend in electric power consumption shows a steady increase and concentration in large cities and industrial districts. This indicates strong need for a long-distance and enclosed-type power transmission line with large capacity and high reliability. A hybrid gas-insulated transmission line (H-GIL), which has the combined features of an XLPE cable and a conventional gas-insulated transmission line (GIL), has the potential to be applicable to such use.
In the present work, we analyze the required dimension and the current capacity of H-GIL on the basis of insulation and thermal design for various parameters determining the structure. We also report an experimental study on flashover characteristics for a simple electrode model of H-GIL. The results show that the H-GIL can be realized with almost the same sheath diameter and current capacity as a conventional GIL. The experiment has also clarified that the insulation reliability of the H-GIL is much higher than that of a GIL. These properties show that the H-GIL has enough feasibility applicable as a long-distance and reliable transmission line with large capacity especially in urban areas.
