ELECTROMAGNETIC TRANSIENTS ON COMPENSATED LINES UNDER CORONA
Titel:
ELECTROMAGNETIC TRANSIENTS ON COMPENSATED LINES UNDER CORONA
Auteur:
Saied, Mohamed Mostafa Safar, Yousef A.
Verschenen in:
Electric power components & systems
Paginering:
Jaargang 16 (1989) nr. 6 pagina's 441-462
Jaar:
1989
Inhoud:
The purpose of this paper is to present a digital computational method for the determination of the fast electromagnetic transients propagating on compensated overhead power lines, evoked by internal or external over voltages, as effected by corona discharges. The approach enables the consideration of series capacitor and shunt reactor compensation. The line model is based on time-domain solution using the Runge-Kutta-Verner numerical technique to solve a set of simultaneous differential equations, whose number depends on the assumed number of line sections, as derived from the line equivalent circuit. The increase of the location-dependent conductor effective radius due to corona is considered as one of variable sets, using an iterative solution procedure. To avoid the parasitic Gibbs-oscillations due to the finite number of line sections (which are superimposed on the actual solutions, a set of properly chosen damping resistors is added to the line model, yielding a frequency-dependent damping. The simulation of the corona discharge uses a model derived from an experimentally measurable voltage-charge hysteresis loop relationship of a line test length. As far the input voltage stimuli are concerned, so the model can consider any voltage-time function (step, ramp, double-exponential, sine waves...etc), or even be in the form of tabulated numerical data. The validity of the model is checked by comparing its results to corresponding measurements.
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