Title :
Short tail lightning impulse behaviour of medium voltage line insulation
Author :
Carrus, A. ; Cinieri, E. ; Fumi, A. ; Mazzetti, C.
Author_Institution :
Rome Univ., Italy
fDate :
1/1/1999 12:00:00 AM
Abstract :
Insulation failure in medium voltage (10-20 kV) and electric traction lines (3 kV DC) is mainly due to indirect and direct lightning strokes to the lines. The overvoltages stressing the insulation have an impulse shape with a very short tail, much shorter than the standard 1.2/50 μs wave. The paper presents the results of experimental tests performed with a 1.2/4 μs wave, on air gaps and insulators in use in the lines under consideration. The flashover probability distributions and the voltage-time to breakdown characteristics under 1.2/4 μs waves determined are presented and compared with the 1.2/50 μs
Keywords :
flashover; impulse testing; insulation testing; lightning; overvoltage; power transmission lines; probability; 1.2 mus; 10 to 20 kV; 3 kV; 4 mus; 50 mus; air gaps; flashover probability distributions; insulation breakdown tests; insulation failure; insulators; medium voltage line insulation; overvoltage stress; short tail lightning impulse behaviour; voltage-time to breakdown characteristics; Air gaps; Breakdown voltage; Dielectrics and electrical insulation; Insulator testing; Lightning; Medium voltage; Performance evaluation; Shape; Surges; Tail;
Journal_Title :
Power Delivery, IEEE Transactions on
