Abstract: | This paper presents some relations established by authors, for analytical design of protective zones at horizontal lightning rods, according to standard NTE 001/03/00. There are presented relations for usually cases in the energetically installations: an inclined horizontal lightning rod, two inclined and unparallel horizontal lightning rods, two parallel horizontal lightning rods. Using of analytical models proposed by authors permit as design and verification of protective zone surface to make easier for complex electrical installations, such as substations. |