The first successful repair technology of medium voltage cross-linked cable on-site insulation water tree

National Energy Administration News On February 25th, State Grid Sichuan Electric Power Company successfully used the cable insulation field repair technology for the first time in Luzhou 220kV Linzhuang Substation to achieve on-site insulation repair for 10kV running cables, marking the scene of my country's power grid cable insulation. A major breakthrough has been made in the repair technology, which provides technical support for solving the problem of insulation aging of urban distribution network cables in the future. In this cable repair technology, the silicone repair solution is injected into the cable core of the high-voltage cable under pressure, so that the repair solution chemically reacts with water, and the generated silicone resin material fills the water tree gap of the cable, thereby eliminating water trees, water trees, and water. The function of repairing cable insulation and prolonging cable life is the first time that this technology is used in China.