Title :
Sparkover voltage of sphere gaps under standard lightning and switching impulse voltages
Author :
Gourgoulis, D.E. ; Mikropoulos, P.N. ; Stassinopoulos, C.A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Aristotelian Univ. of Thessaloniki, Greece
fDate :
5/1/1996 12:00:00 AM
Abstract :
The influence of impulse shape, gap spacing and of humidity on the sparkover voltage of sphere gaps consisting of 25 cm diameter spheres has been studied for both polarities under standard waveshapes of 1.2/50 μs and 250/2500 μs. Results are compared with the values proposed by the IEC standard and an attempt to explain the breakdown mechanism and especially how it is influenced both by humidity and the waveshape has been made. Further suggestions are given concerning their use as calibrating gaps, especially under switching impulses. Also, under certain conditions, the inclusion in the calibrating gaps of 15 cm gaps is proposed
Keywords :
calibration; electric breakdown; lightning; spark gaps; switching; transients; 1.2 Es; 2.5 to 15 cm; 250 mus; 2500 mus; 50 mus; breakdown mechanism; breakdown probability curves; calibrating gaps; gap spacing; humidity influence; impulse shape; lightning impulse voltages; sparkover voltage; sphere gaps; standard waveshapes; switching impulse voltages;
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
DOI :
10.1049/ip-smt:19960086
