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In this paper, an analysis study on parameters which affecting the backflash over pattern cause by lightning is done. A 132kV double circuit transmission line is modeled using ElectroMagnetic Transient Program EMTP software for backflash over simulation. A vertically configured double circuit transmission line can be modeled into several parts: towers, insulators, phase conductors, ground wire and...
Lightning stroke is the key problem for safe operation of UHV transmission line. Because of the large scale of the tower and the high operation AC voltage, the shielding design of tower became one of the most important aspects of the UHV transmission line design. This paper was based on the typical towers of China 1000 kV AC transmission line: waist-type single-circuit tower, cup-shape single-circuit...
This paper represents a developed procedure for the evaluation of flashover rates caused by both lightning vertical and non-vertical strokes on transmission lines using a Monte Carlo method. The main goal of this paper is increase the accuracy of the flashover rates through an accurate modelling of network components such as footing impedance, transmission tower and the chain of insulators and also...
Lightning flash is one of the natural causes of faults in overhead transmission lines. The critical stroke current which causes flashover is a basic parameter characterizing the lightning performance of transmission lines. In recent times, there has not been any mature experience to be referred to either in China or other foreign countries of the study on lightning withstand level of UHVDC transmission...
This paper presents a comparative lightning performance study conducted on a 275 kV double circuit shielded transmission line using two software programs, TFlash and Sigma-Slp. The line performance was investigated by using both a single stroke and a statistical performance analysis and considering cases of shielding failure and backflashover. A sensitivity analysis was carried out to determine the...
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