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Study of flashover model on overhead distribution lines
Author(s) -
Asano Kentaro,
Miyazato Kenji,
Hara Kazuhiko,
Shimomura Tetsuro,
Horinouchi Yusaku
Publication year - 2004
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20022
Subject(s) - arc flash , waveform , electrical engineering , electrical impedance , breakdown voltage , voltage , materials science , impulse (physics) , transient (computer programming) , mechanics , engineering , physics , computer science , quantum mechanics , operating system
We have carried out analysis of lightning surge on overhead distribution lines by means of EMTP. We made a model for electric breakdown of a 14‐m concrete pole with impulse voltage (rise time: 2 μ s) applied to the outer surface at the top of the concrete pole. We found that the transient impedance of the breakdown increased linearly before the breakdown and decreased exponentially after the breakdown. The measured voltage and current waveforms correspond to the calculated waveforms by regarding the impedance of the breakdown as resistance. Also we examined the impedance of flashover of an insulator with impulse voltage applied to the lines. The transient impedance of flashover is expressed approximately by the formula: Z ( t ) = A × exp(−(t − t 0 )/τ) ( A = 1500 to 5000, τ = 3 × 10 −8 to 5 × 10 −8 s, t : time, t 0 : starting time of flashover). © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 34–41, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20022