Research on Ice-shedding Prevention and Control Technology for Isolated Transmission Line Based on Spacer Rod

Line jump subjected to ice-shedding may cause inter-phase flashover and tripping of transmission lines, while excessive dynamic tension can lead to structural damage, severely threatening the safe and stable operation of the transmission lines. This paper aims to propose a transmission conductor ice-shedding jump prevention and control technology based on spacer rods. Taking a practical isolated transmission line project as a case study, the nonlinear finite element method is used to investigate the effect of inter-phase spacer rods on suppressing conductor ice-shedding jumps. The inter-phase spacer rods are placed at various positions within the isolated conductor, and a comparative study is conducted on the jump height and maximum dynamic tension response of the conductor after ice-shedding, both with and without the inter-phase spacer rods. The results show that the inter-phase spacer rod is effective in suppressing the jump height after ice-shedding. The closer the inter-phase spacer rod is positioned to the center of the conductor span, the better the suppression effect, with a maximum reduction of approximately 51.5% in jump height. The inter-phase spacer rod also mitigates the sudden tension change caused by ice-shedding, and their impact on the maximum dynamic tension after ice-shedding is minimal and can be neglected. This paper provides guidance for the prevention and control of ice-shedding jumps in transmission lines.