輸電線路雷擊跳閘率分級評估方法研究
童杭偉1,王燦燦2,楊健偉2,王少華1
(1 國網(wǎng)浙江省電力公司電力科學(xué)研究院,浙江 杭州 310014;
2 國網(wǎng)浙江麗水供電公司,浙江 麗水 323000)
摘 要: 雷擊跳閘對電網(wǎng)的安全運(yùn)行和供電可靠性構(gòu)成了嚴(yán)重威脅。介紹了輸電線路雷擊跳閘率的理論值和實(shí)際值計(jì)算方法,提出了雷擊跳閘率分級評估方法,并應(yīng)用于工程實(shí)際。結(jié)果表明:采集精確的地閃密度數(shù)據(jù),準(zhǔn)確計(jì)算輸電線路雷擊跳閘率是雷擊風(fēng)險(xiǎn)評估的重要基礎(chǔ);雷擊跳閘評估可采用雷擊跳閘率與線路雷擊跳閘率指標(biāo)的對比方法,風(fēng)險(xiǎn)級別分為4 級;浙江220 kV楠麗線133 基桿塔中,70% 的桿塔雷擊跳閘風(fēng)險(xiǎn)等級為C 級及以上,建議優(yōu)先進(jìn)行防雷改造。
關(guān)鍵詞: 輸電線路;雷擊跳閘率;分級評估;防雷;地閃密度
中圖分類號:TM726 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2015)03-0017-04
Study on Grading Assessment Method of Lightning Trip-Out Rate of Transmission Lines
TONG Hang-wei1, WANG Can-can2, YANG Jian-wei2, WANG Shao-hua1
(1 State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014 , China;
2 State Grid Zhejiang Lishui Power Supply Company, Lishui 323000, China)
Abstract: The lightning trip-out rate has seriously threatened the safe operation and reliable power transmission of power grid. Introduction was made to the theoretical values and actual calculation methods of lightning trip-out rate in transmission lines. This paper put forward the grading evaluation method of lightning trip-out rate and put it in the real project application. The result shows that the accurate acquisition of flash density data and the right calculation of lightning trip-out rate is the key foundation for risk assessment. Lightning trip-out rate grading assessment could be performed by comparing the indexes between the lightning trip-out rate and the lightning line trip-out rate and the level of risk is divided into four grades. Taking the level of risk of 133 base towers in 220 kV transmission line of Nanli in Zhejiang province as an example, 70% of them is C-level or above. It is concluded that lightning protection transformation should be carried out in priority.
Key words: transmission line; lightning trip-out rate; grading assessment; lightning proof; flash density
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