New method of preventing ice disaster in power grid using expanded conductors in heavy icing area

摘要

Considering continuous power supply conditions, there is currently no effective method for preventing ice disaster, and also some deficiencies of the existing completed short-circuit ice melting method has been found. Here, taking typical bundled and expanded conductors as the sample, its icing performance was tested and the combined ice-wind load of tested lines was analysed. Then, a new method of substituting expanded conductors with the same conductive cross-sectional area for bundled conductors to prevent ice disasters is proposed. Research results showed that: from stagnation point to both sides of crescent-shaped conductors, local collision rate gradually reduce to 0; under various meteorological factors, there is still a power function relationship between ice thickness of conductors (D-c) and the diameter of conductors (D); the ice amount of six tested conductors gradually increases with the increase of ice thickness of Rotating Single-Cylinder Ice Collector (D-r), while the ice amount reduction rate reduces first and then increases with D-r; the combined ice-wind load ratio of bundled and expanded conductors increases with the increase of wind speed and D-r. Therefore, it is a low-cost method for improving the anti-icing capacity of transmission lines and preventing icing disaster once and for all.