In mountains area, we can use direct graphic method to calculate and draw the graph for protection area of lightning rod.
在山坡地区，避雷针保护范围计算及作图，也可应用避雷针保护的直接作图法。
Study on transient characteristics of overhead transmission lines due to direct lightning stroke is significant to the development of transient based protection and its reliability improvement.
研究和识别输电线路直击雷的暂态特征对研制基于暂态量的保护及提高其可靠性都具有十分重要的意义。
In mountains area, when calculating and drawing the graph for protection area of lightning rod, we can use the direct graphic method.
在山坡地区，避雷针保护范围计算及作图可应用避雷针保护直接作图法。
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