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This paper addressed surge propagation on a vertical line with a discontinuity. A formula of surge reflection coefficient expressed by specially-defined surge impedance was introduced, which is similar to that of a conventional transmission line. The formula for the discontinuity with a lumped resistance was also presented. With these formulas, surges on the line with the discontinuity can be evaluated...
This paper presents a study of lightning induced surges in railway signaling systems with the FDTD method. During an indirect lightning strike, induced surges are observed in the outdoor circuits due to electric and magnetic coupling. The induced surge currents propagate along the signal cables towards the receiving equipment in railway stations. It is found that geometry of the outdoor lines, earthing...
This paper presents a Partial Element Equivalent Circuit (PEEC) based simulation tool, called TAES for simulating transients in a wire system. The enhancement in the traditional PEEC model with the vector fitting method is provided in order to achieve a time domain simulation for frequency-dependent conductors. A system with steel bars, cables and arrestors is studied and results of experimental verification...
The household appliances in buildings have increased rapidly in the recent years. However, the surge withstanding capability of these household appliances has not been increased. Therefore, it is necessary to install surge protection device (SPD) to prevent serious damage of household electrical appliances caused by the in-rushing surges. In order to avoid the oscillation phenomenon, the effective...
This paper presents an investigation into transient surge impedance of a vertical conductor over a perfect ground during a lightning struck. An equivalent circuit approach is employed, and voltage on the conductor is directly obtained by using traditional circuit analysis techniques. The transient surge impedance is then computed with the instantaneous voltage and current obtained in the simulation,...
This paper presented a modeling procedure for a DC traction power system (TPS) of electrified railway to study lightning transients with EMTP. The TPS included overhead lines, electric cables on the ground, masts and other associated components. The nonlinear ionization characteristic of earth resistance and the flashover characteristic of insulators were taken into account. These models were integrated...
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