气象要素对电力污闪发生的影响

Influence of Meteorological Elements on Electric Power Pollution Flashover Occurrence

利用石家庄地区1990～2013年电力污闪事故发生的详细资料，归纳整理出污闪发生的一般规律，结合诱发污闪发生的天气现象和气象要素，综合在不同气象条件下污闪发生的可能性大小，对其进行分级，给出污闪发生级别的综合预测标准，从而判定预测电力污闪发生的气象指数，并提出必要安全预防措施。结果表明：当气温＞15．6℃，相对湿度＜45％，风速＞4．8 m／s时天气晴朗，不会发生污闪；在相对湿度≥80％，风速≤2．0 m／s时，气温在－7．5～7．5℃时出现雾，气温在－4．5～4．5℃时出现积雪或结冰，极易发生污闪；在相对湿度≥80％，风速≤2．0 m／s，气温在－4．5～4．5 ℃时出现液态、混合或固态降水、轻雾，容易发生污闪。

Electric power pollution flashover occurring under different meteorological conditions was analyzed to improve the ability a-bout prediction of it. Based on the detailed information on electric power pollution flashover from 1990 to 2013 in Shijiazhuang,its gen-eral rules were organized and classified. Comprehensive prediction criterion of electric power pollution flashover was given,the meteoro-logical index criterion was determined,and the necessary safety precaution was proposed according to weather phenomenon and meteoro-logical elements. The results show that electric power pollution flashover would not happen when it was sunny with temperature more than 15. 6 ℃,the relative humidity less than 45% and wind speed greater than 4. 8 meters per second. Electric power pollution flash-over would happen very easily when it was misty with temperature being from -7. 5 ℃ to 7. 5 ℃,and it was snowy and icy with tem-perature being from -4. 5 ℃ to 4. 5 ℃ under the condition of relative humidity being not less than 80% and wind speed being not greater than 2. 0 meters per second. Electric power pollution flashover would happen easily when it was liquid,solid or mixed precipita-tion and it was light fog under the condition of relative humidity move than 80% and wind speed less than 2. 0 meters per second.