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Exact formulas for internal impedance per unit length of solid and tubular cylindrical conductors energized by time-harmonic current involve Bessel functions. These functions are defined by infinite series, which yield unstable and often erroneous results for large magnitudes of the complex function arguments. For such cases, approximate formulas can be used. Results obtained by exact formula and...
This paper presents a brief review of the most important methods available for the grounding grid analysis. This includes numerical methods intended for the grounding grid direct current, time-harmonic current and transient current energization. Emphasis will be given to the methods involving transient grounding grid analysis. Available numerical methods will be surveyed according to the implemented...
In this paper the lightning current function proposed in IEC 62305-1 is approximated by a linear combination of exponential functions in the time domain, which will afterwards be analytically transformed into the frequency domain. The unknown coefficients of the exponential approximation are computed using the least squares method. Lightning current function in the frequency domain can be used for...
This paper presents a mathematical model of the lightning stroke path development. Any lightning model is a mathematical construct design to reproduce certain aspects of the physical process involved in the lightning discharge. This mathematical model resides on the underlying observed physical properties of the lightning stroke development. It uses Monte Carlo based algorithm in order to simulate...
This paper presents a novel computational algorithm for the determination of the overhead power line electromagnetic fields. Algorithm is based on the separation of the phase conductor currents into its longitudinal and transversal components and application of the Biot-Savart law for the computing of the magnetic field. Longitudinal component of the electric field is computed from vector magnetic...
Przedstawiono macierze elementów skończonych dla dwuwymiarowej analizy wiroprądowej z wykorzystaniem ośmiowęzłowych czworobocznych izoparametrycznych elementów skończonych. Szczególną uwagę zwrócono na sformułowanie macierzy elementu skończonego dla przewodników w polu quasi-stacjonarnym z uwzględnieniem warunków brzegowych i topologii przewodników.
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