Behavior of MV Insulators Under Lightning-Induced Overvoltages: Experimental Results and Reproduction of Volt-Time Characteristics by Disruptive Effect Models

This paper presents the results of experimental tests performed with an impulse voltage of short tail (STLI: 1.2/4 ¿s), similar to lightning-induced overvoltages, on composite insulators used in the electric traction lines. The characteristics of volt-time breakdown under STLI waves are shown and co...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2010-01, Vol.25 (1), p.221-230
Main Authors: Ancajima, A., Carrus, A., Cinieri, E., Mazzetti, C.
Format: Article
Language:English
Subjects:
Applied sciences
Arcs, sparks, lightning
Dielectrics and electrical insulation
Electric discharges
Electric potential
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Impulse testing
Impulses
Insulation coordination
Insulators
Lightning
lightning-induced overvoltages
Materials
Miscellaneous
Overvoltage
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Power networks and lines
Power transformer insulation
Rail transportation
Reproduction
Shape
Stress
Surges
Tail
time to spark over models
Various equipment and components
volt-time characteristics
Voltage
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Summary:This paper presents the results of experimental tests performed with an impulse voltage of short tail (STLI: 1.2/4 ¿s), similar to lightning-induced overvoltages, on composite insulators used in the electric traction lines. The characteristics of volt-time breakdown under STLI waves are shown and compared with the characteristics obtained under standard lightning impulse (LI:1.2/50 ¿s). Models based on the disruptive effect, as proposed by Kind and Chowdhuri, are considered and applied in order to reproduce the volt-time characteristics under standard and nonstandard lightning voltages. The application viability of these models to tested insulators is considered and discussed and the accuracy in their reproduction is evaluated. It is demonstrated that the Kind model, calibrated with a suitable selection of the parameters using standard flashover data (LI), is able to estimate the response of the insulators to the short tail lightning impulses (STLI) with satisfactory accuracy.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2009.2033956