Lightning arrester spark gaps — II

This paper presents data giving the discharge characteristics of a commercial type of impulse gap under different conditions. Test data are also presented giving the characteristics of certain experimental gap structures designed to minimize the effects of adverse weather conditions, such as rain, fog, etc. A brief discussion of some of the factors that determine the degree of protection afforded by a lightning arrester spark gap is included in the paper. The term “protection factor” is defined and curves giving the protection factor of certain types of gap are presented.