Abstract: | This paper presents some relations established by authors, for analytical design of protective zones at vertical lightning rods, according to standard NTE 001/03/00. There are presented relations for usually cases in the energetic installations: a vertical lightning rod, two lightning rods with equal heights, and two lightning rods with different heights. The analytical models proposed by authors permit easy design and verification of protective surface for complex electrical installations. For example, using these relations it can be easy design the protective surface of substation. |