Development of new low lift snow-retardant insulated wire for overhead distribution line

Recently in the snowfall area of the northern part of Japan, snow-retardant insulated wires with a two fin structure are mainly used for 600 V and 6.6 kV class overhead distribution lines to protect against such snow damage. These two fins are placed longitudinally on the insulation at an angle of 180° and their height and width are relatively small; 1 mm and 1.5 mm respectively. Although the snow-retardant insulated wire has good performance against snow damage, the violent vibration of the wire was observed several times under a strong wind and fatigue of conductor occurred as a result of the repeated high stress and vibration at the wire supporting part. In this paper, the aerodynamic vibration occurrence mechanism for snow-retardant insulated wires and measures for vibration suppression are discussed