Research on Non-simultaneous Outage Measures for 110 to 220 kVDouble-circuit Lines on the Same Tower

To solve the problems of total substation outages or overcurrent on adjacent 110 to 220 kV lines caused by simultaneous outages of 110 to 220 kV double-circuit lines on the same tower, and to facilitate greater integration of photovoltaic and other renewable energy sources, this paper takes a 220 kV local power grid as an example. It studies non-simultaneous outage measures for double-circuit lines on the same tower from the aspects of transmission line lightning protection and anti-galloping. An unbalanced insulation configuration in which one circuit has a higher insulation level is proposed. At the suspension insulator strings or jumper insulator strings of the three-phase conductors in the higher-insulation circuit, one set of line-type zinc oxide surge arresters is installed on every tower. Double-spring damping devices are also added to the interphase spacers. These measures enable non-simultaneous outages of the two circuits on the same tower. An economic comparison shows that the costs of lightning protection and anti-galloping measures are much lower than the cost of reconstructing the electrical configuration of the local power grid.