摘要
10 kV线路避雷器雷击放电电流是其试验方法、型号选择和运行寿命评估的关键问题。采用电磁暂态程序(EMTP)和电气几何模型法,分析了首次和后续雷击典型结构10 kV线路杆塔和导线的情况下,首次雷击和后续雷击的雷电流波头、波尾和幅值概率分布、杆塔接地电阻和杆塔高度等因素对避雷器放电电流的影响。结果表明:首次雷击引起的避雷器放电电流幅值、波尾、年预计雷击数比后续雷击大得多;取雷电流中值波头、中值波尾首次雷击杆塔情况下,避雷器放电电流波形能量大于标称放电电流8/20 s波形;雷电流幅值分布中值电流增大,线路避雷器放电电流波头、波尾、幅值和线路年预计雷击数都增加。
The discharge current of 10 kV distribution line surge arrester is the key problem of test method, selection of arrester type and service life assessment. The EMTP and electro-geometric model are used to analyze the condition of the first or subsequent lightning stroke on the conductor and line tower, the discharge current affected factors： current wave front time, wave tail time and peak current distribution of the first and subsequent hghtning stroke, as well as tower grounding resistance and tower height are analyzed. The results show that the discharge current of distribution line surge arrester due to the first stroke are larger than due to subsequent stroke. The energy of discharge current of distribution line surge arrester under median current front time and median wave tail of the first stroke on tower head condition are large than nominal discharge current 8/20 s. The front time, wave tail and peak current of distribution line surge arrester discharge current and annual number of lightning strokes increased with median current of lightning current distribution.
出处
《电瓷避雷器》
CAS
北大核心
2015年第5期71-76,共6页
Insulators and Surge Arresters
关键词
直击雷
10
kV线路避雷器
放电电流
EMTP
电气几何模型
direct lightning stroke
10 kV distribution line surge arrester
discharge current
EMTP
electro-geometric model
