Feasibility study of flexible gas-insulated transmission line using CF3I gas mixture

Abstract

In these days, a large number of offshore wind-farms projects are planned. For power delivery from such an offshore wind-farm with large amounts of energy, a gas-insulated transmission line (GIL) is expected to offer a solution owing to its low capacitance. In this paper, a test model of 22 kV-class flexible GIL (FGIL) system is designed, which has the same or more flexibility as a cable system has. In this article, we propose a FGIL utilizing atmospheric pressure CF3 I gas, which is one of SF6 alternatives, as insulating medium. Its feasibility is evaluated from the viewpoint of withstand voltage.