摘要
从影响避雷针(线)保护范围主要因素及其无法定量等方面说明了世界各国的避雷针(线)保护范围计算方法均是经验公式,并就GB 50057—1994选用外国经验公式提出质疑;同时指出避雷针(线)保护范围的绕击率除应经理论、实验室分析研究外还要靠实践运行统计分析得出,并分析了实际工程中不宜设置较高的独立避雷针(线),非金属结构屋顶应用避雷网,不宜用避雷针的原因。
It is stressed in this paper that all formulas dealing with the protection range of lightning rods and overhead ground wires at home and abroad are empirical formulas, for some key influencing factors can not be quantitated. The adoption of the foreign empirical formula in GB 50057-1994 is also queried. It is indicated that the risk of shielding failure in the protection range of lightning rods and overhead ground wires should be acquired through theoretical analysis, laboratory test and research as well as statistical analysis based on long-term practice. The reason why relatively high independent lightning rods or overhead ground wires are not appropriate for actual projects is analyzed, and the use of lightning protection net for roofs of nonmetallic structure is expounded.
出处
《广东电力》
2005年第12期12-14,38,共4页
Guangdong Electric Power
关键词
避雷针(线)
防直击雷
雷电流
绕击率
lightning rod （overhead ground wire）
protection against direct lightning strike
lightning current
risk of shielding failure
