Title :
The effects of nonstandard lightning voltage waveshapes on the impulse strength of short air gaps
Author :
Chowdhuri, P. ; Mishra, A.K. ; Martin, P.M. ; McConnell, B.W.
Author_Institution :
Tennessee Technol. Univ., Cookeville, TN, USA
fDate :
10/1/1994 12:00:00 AM
Abstract :
Sphere-sphere, rod-rod and rod-plane air gaps, each 5-cm long, were tested with lightning surges of eight voltage waves of both polarities. The critical breakdown voltage levels of the tested air gaps attained a minimum plateau within a specific range of wavefronts of the lightning surges. Long time delays of breakdown for the fast-front and short time delays for the slow-front waves were observed. These phenomena would significantly affect the insulation coordination of the power apparatus and systems
Keywords :
air gaps; electric breakdown; electric strength; gases; impulse testing; insulation testing; lightning; overvoltage; surges; transient analysis; transients; 5 cm; critical breakdown voltage levels; fast-front waves; impulse strength; impulse voltage measurement; insulation coordination; lightning surges; long time delays; nonstandard lightning voltage waveshapes; power apparatus; power systems; rod-plane air gaps; rod-rod air gaps; short air gaps; short time delays; slow-front waves; sphere-sphere air gaps; Air gaps; Breakdown voltage; Delay effects; Dielectrics and electrical insulation; Electric breakdown; Lightning; Power system reliability; Power system transients; Surges; Testing;
Journal_Title :
Power Delivery, IEEE Transactions on
