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Recently, current-limiting arcing horn with zin c oxide elements have been installed on distribution lines as lightning protection equipment. In this paper, we show an analytical study of rational lightning protection measures with the above equipment on power distribution lines using the assessment method of lightning risk.
In the service area of the Hungarian DSOs many of the failures of medium voltage devices are related to the lack of requirements regarding to the technical side of the procurement processes. The main aim of a research and development project executed by the High Voltage Laboratory of Budapest University of Technology and Economics was the inspection of current failure rates and typical ways of failures...
We have clarified the relationship between the grounding resistance of surge arresters and the lightning surge behavior observed in low-voltage equipment by Electro-Magnetic Transients Program analysis. The result shows that the grounding resistance of surge arresters installed on a pole with a pole transformer can be increased to some extent without decreasing the lightning protection level of the...
This paper describes switching overvoltage of 345[kV] combined transmission system. Generally, switching overvoltage may cause the breakdown of insulation or joints of the underground power cable section. Therefore, in this paper, the various switching overvoltages are analysed according to the change of fault resistance, the amplitude of trapped charge and underground cable rate on 345[kV] combined...
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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