While grounding rods are basic and surge protectors can cost as much as $400 or more, a perhaps bigger expense is to organize and maintain the system, he said.
他说，接地棒是最基本的，避雷器成本可能高达400美元或以上，但或许更大的开支是组织和维护这个系统。
2
Tower grounding resistance, distance between towers, etc can affect the function of line-surge arrester.
输电线路的接地电阻，线路档距等因素对线路型避雷器的应用有影响。
3
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.