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This article concerns reliability assessment of an electricity distribution substation surge protection system, composed of surge arresters. For this purpose a reliability analysis is performed and also a surge protection system reliability mathematical model is suggested. Based on it mathematical formulae are worked out intended for practical calculation of proper reliability indices values. The...
The flow of the lightning current through the grounding grids of electrical substations produces impulse processes in the soil. The authors have developed a simulation model of the grounding, considering the wave processes. To expand the model, determination of the maximum possible touch voltage in these processes have to be done. This report proposes a mathematical model, describing the dependence...
The direct stroke of a lightning in the power lines is a major cause of failure of the linear isolation and the disruption of the normal operation of electrical grids. In the power lines for high voltages prevail the reverse discharges — from atmospheric overvoltages, struck on the towers or on the ground wire near the towers. In order to be taken the necessary precautions, researches should be made,...
The high-voltage switchgears are frequently exposed to lightning strokes. The arising overvoltage in some cases can exceed the insulation level of the power equipment. A commonly used lightning protection devices are the metal-oxide surge arresters. This paper presents a developed simulation model, appropriate for assessment of the impact of lightning strokes on the insulation of the switchyard equipment...
The aim of the current report is to find the mathematical equation describing the dependence on resistivity and dielectric permittivity of frequency for multilayer soil. Experiments have been taken for the researched dependencies for the particular field of future substation.
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