The Classified According And Severity Maps Of Ice In Chongqing Power Grid

As the global climate getting warm, electric power system is damaged by icing that become increasingly prominent. A history rare icing disaster has happened in 2008 in Southern China caused large area power cut, done serious harm to national life. This ice disaster also happened in Chongqing. The safe of power grid suffered great damage. From that on, the power system icing study was beginning to be taken great attention. It's important to study the icing on the release of the transmission line protection.The designed anti-ice thickness much less than the actual ice thickness on the transmission line is the mainly cause of the accident ice storm. Present it's quite different on the on-site ice thickness and the ice thickness in the artifical laboratory testing or simulation. The ice measurement sensors have their limit. There have errors when measure icing factors. It will lead the deviation when calculated ice thickness.If we can not accurately determine the actual ice on transmission line during the design, it will caused serious accidents. This article is based on the ice data on transmission line in Chongqing, 2008. According to the special climate, terrain condition and ice characteristica in Chongqing, we can determined the classified foundation of ice. It can have the ice zoning map by use the foundation. In this paper, the map palys an important role to the ice protection on transmission line, devise the new circuit and choose route and the transformation of the old line. It's important for the rational planning and scientific design of power grid. So the study of this paper of icing level map realizes important academic significance and engineering application value. Accoiding to the transmission lines and ice accident data of the Chongqing region in 2008, analysing the background and causes of the ice accident occurred in 2008. It can summarize the characteristics of ice in Chongqing Power Grid. Taking into account the characteristics of lead ice and influencing factors, it can identify four ice zoning authority: ambient temperature, relative humidity, speed of the wind and altitude.Ambient temperature, relative humidity and wind are the formation of ice leads the decisive factors. At different altitudes, ice and various influencing factors are different. In turn, this affects distribution of the ice thickness on the wires.According to the environmental temperature, relative humidity and the speed of zhe wind; It carved out of ice districts and counties in Chongqing region. Analysised ice elevation model and detailed breakdown of the ice region, we can drawed the region ice zoning map. The terrain is complex in Chongqing. There are many number of micro-topography and micro-climate locations in Chongqing. The ice is more severe on the location of micro-topography and micro-climate. The rivers and lakes are all over the city. It can not be ignored the affect of water vapor on the ice of wire. So in this paper, we should use the two affect to correct the ice zoning of Chongqing. After that we can obtained a reasonable and accurate ice zoning map.