Probabilistic assessment of flashover performance of transmission lines in contaminated areas

Suzuki, Yoshihiro; Fukuta, Toshibumi; Mizuno, Yukio; Naito, K.

doi:10.1109/94.775620

Cited by 6 publications

(2 citation statements)

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“…If this unstable equilibrium is perturbed then a discharge will appear along the length of the dry band and the current pulse intensity will be reduced by the resistance of the residual polluted surface. The extension of arcs along the length of the dry bands depends on many factors, mainly the non-uniformity of the surface pollution, the deposit's resistivity and the peak leakage current value [1][2][3][4][5][6][7][8][9][10].…”

Section: Discussionmentioning

confidence: 99%

“…The probability of flashover on an insulator with pollution depends mainly on two factors: the degree of pollution and the wetting conditions. The pollution flashover process, as generally accepted, is that it consists of the following phases: deposition of the pollution on the surface of the insulators, moistening resulting in a conductive electrolyte film, leakage currents developing, heating and dry band formation, partial arcing, and arc elongation leading, finally, to complete flashover between the electrodes of the insulator [1][2][3][4]. according to international and national standards (IEC 507, 815, 383, 1109, ANSI C29.11, VDE 0441, 0278, ASTM D2303, D2132, CEA wheel Tests, etc).…”

Section: Introductionmentioning

confidence: 99%

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Measurements and interpretations concerning leakage currents on polluted high voltage insulators

Thalassinakis

Karagiannopoulos

2003

Meas. Sci. Technol.

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This paper presents data that may aid physical interpretation of leakage currents on insulators suffering pollution under real physical conditions. The measurements were performed on the power distribution system on the island of Crete. An on-line recording system has been installed on the insulators of the 150 kV network, in order to monitor the leakage currents on the polluted insulators and investigate the various parameters of the phenomena. It is convincingly shown that in the timeframe of one period of 50 Hz, above a threshold voltage value (smaller than the peak voltage) a non-linear i -v relationship may develop, leading to bistability and non-linear conductance phenomena. The well-established theory regarding leakage currents on high voltage insulators, as well as that concerning dielectrics in strong electric fields, provide the required theoretical basis for the interpretation of the experimental results obtained.

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