Insulators with Contaminated Surfaces, Part II: Modeling of Discharge Mechanisms

Static modelling of AC flashover on contaminated insulators covered with ice using intelligent identificat ion methods =

“…Moreover, the mathematical resistance model was proposed to calculate flashover voltage. [117] This model deals with the mechanism of discharge on the surface within the boundary of the two circular electrodes illustrated in figure 2.2. A mathematical model, is considered using a simple geometry of a flat plate with concentric circular electrodes.…”

“…Uitbridged ice layer Figure 3.5 Equivalent circuit used for modeling arc propagation on iced surfaces [37] The formulas were also derived based on the simulation results, as well as the experiments carried out by Ishii et al [117], in order to take into account the arc temperature as a function of the applied voltage level for DC+ and DC- [35].…”

“…[112,59] The foregoing discussions about the complex nature of the residual resistance of contaminated insulators covered with ice reveals that any analytical approach aimed at developing a formula for residual resistance seems to be extremely difficult. Nevertheless, being inspired by the power of the finite element method, one may think about calculating the electric field using a sophisticated finite element software within very complex In spite of several resistance models given for polluted surfaces by different authors as reviewed through chapter II of this dissertation [95,48,116,118,117,79], none of them is applicable to the situation of pre-contaminated Insulators covered with ice. In the case of Ice covered Insulators, Farzaneh and Zhang [29] have employed the R. Wilklns resistance model [116], assuming the conductive surface in series with the arc is composed of a very thin water film on the surface of the ice accretion.…”

Dynamic modeling of AC arc development on ice surfaces

“…3.7 Form Factor plotted against creeping distance for a cap and pin 43 insulator [22]. 3.8 Disc insulator model as studied by McElroy [143]. 44 …”

Étude de l'influence des caractéristiques des isolateurs sur leurs performances électriques dans des conditions de givrage /

“…Woodson et McElroy ont représenté l'isolateur comme un disque circulaire en partant de l'hypothèse que la résistance superficielle de la couche de pollution humide peut s'exprimer en fonction du rayon de l'électrode externe et de la résistivité superficielle du polluant [Woodson et McElroy, 1970].…”