Short tail lightning impulse behaviour of medium voltage line insulation

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 /spl mu/s wave. The...

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Bibliographic Details
Published in:IEEE transactions on power delivery 1999-01, Vol.14 (1), p.218-226
Main Authors: Carrus, A., Cinieri, E., Fumi, A., Mazzetti, C.
Format: Article
Language:English
Subjects:
Air gaps
Breakdown voltage
Dielectrics and electrical insulation
Electric potential
Impulses
Insulation
Insulator testing
Insulators
Lightning
Medium voltage
Overvoltage
Performance evaluation
Shape
Surges
Tail
Traction
Voltage
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Summary: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 /spl mu/s wave. The paper presents the results of experimental tests performed with a 1.2/4 /spl mu/s 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 /spl mu/s waves determined are presented and compared with the 1.2/50 /spl mu/s.
ISSN:0885-8977
1937-4208
DOI:10.1109/61.736725