The lightning protection could be improved by means of decreasing grounding resistance of tower, installing line type surge arrester and side lightning rod as well as increasing the insulation level.
采取杆塔降阻、装设线路避雷器、侧向避雷针和加强绝缘等多种措施后，防雷保护效果较好。
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。
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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