Abstract
Transmission line disconnection, tower collapse and insulator flashover caused by icing seriously threaten power system security. Ice type and state of transmission lines, which vary a lot with terrain and climate, in typical areas such as Daqing-ridge, Yak Mountain and Erlang Mountain in Sichuan Province in South China were investigated in this paper. It is shown that mixed-phase ice with obvious layered structure, low density, strong adhesive force and windward-side growth is the main type of ice threatening the security of transmission lines and insulators. There is more ice on the ends of insulators than other areas in severe cases, where all sheds of the insulator is bridged by ice. Besides, temperature, humidity and precipitation intensity are main factors influencing the icing process. As a result, terrain and climate play a leading role in determination of icing type and severity.
Highlights
In China, geographical distribution of energy presents a serious imbalance
AC 500kV Gan-Shu line go through 10mm ice area from 019 tower to 022 tower, through 20mm ice area from tower to tower, through 40mm ice area from tower to tower, through 60mm ice area from 024 tower to 033 tower, through 40mm ice area from 033 tower to 040 tower, and through 20mm ice area from 040 tower to 044 tower It shows that icing conditions of transmission lines in Sichuan region are very complex, which makes the anti-icing modification of transmission lines very difficult
In order to understand ice forms, characteristics and formation conditions under microtopography and micrometeorology conditions in south-western China, the paper conducted the research on the icing conditions of several selected typical regions, including Daqing-ridge in Xichang City, Yak Mountain, Erlang Mountain and Luding County
Summary
In China, geographical distribution of energy presents a serious imbalance. The load centers are in concentrated distribution in the southeastern coastal strip, far away from southwest regions where clean hydropower resource is rich. Under the influence of geographical environment in the south-western China, EHV and UHV transmission lines will inevitably go through high altitude areas, canyons, rivers and other regions with complex geography and climate, which leads ice-covered insulator to high flashover risk. In order to understand ice forms, characteristics and formation conditions under microtopography and micrometeorology conditions in south-western China, the paper conducted the research on the icing conditions of several selected typical regions, including Daqing-ridge in Xichang City (altitude 2500m), Yak Mountain (altitude 3100m), Erlang Mountain (average altitude 3000m) and Luding County. Icing process of transmission lines and conditions in these areas is observed and recorded and icing accidents in these areas in recent are analysed and researched, in order to develop a targeted anti-ice strategy for power grid
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