EHV TRANSMISSION LINE ICING ANALYSIS AND COUNTERMEASURES RESEARCH

摘要

Ice accretion on transmission line usually causes conductor galloping and flashover, and then a large area power outage occurs. For the dangers of transmission line icing, from the generation of the conductor icing to the icing hazard, the detailed reason have been analyzed. The methods of installing phase-phase spacer and anti-swing device have been used to reduce the happen of breakdown. Threedimensional laser scanning and imaging technology can be used to build transmission line three-dimensional model. In this model, transmission line corridors and equipment's 3D information can be appeared. Through set the parameters of atmospheric temperature, ice thickness, wind speed, etc. the changes in line sag can be simulated and the clearance between conductor to others can be measured. PLS-CADD software based LiDAR has many advantages in transmission line maintenance. LiDAR collects data around transmission lines and deliver it to PLS-CADD. PLS-CADD is capable of calculating the real time conditions of transmission lines. Ice on lines in PLS-CADD can be specified as: 1) a combination of ice thickness and ice density, 2) a nominal load per unit length of wire, or 3) any combination of the previous two. In this paper, PLS-CADD has been used on transmission lines to circuit modelling and intelligent detection.