REVIEW OF RESEARCH ON NONSTANDARD LIGHTNING VOLTAGE WAVES

Although the impulse insulation level of a power apparatus is specifie d under the standard 1.2x50-mus voltage wave, the apparatus seldom enc ounters such a voltage wave in the field. A wealth of knowledge exists on the behavior of air gaps under nonstandard lightning impulse volta ges. The objective of the Task Force was to compile a bibliography on the nonstandard lightning impulse voltages and review the present stat e of research. This paper reviews the present status of research. The bibliography has been compiled in a companion paper, ''Bibliography on the Research on Nonstandard Lightning Voltage waves''.