Lightning interaction with medium-voltage overhead power distribution systems
| Autor: | Carlo Alberto Nucci, Alexandre Piantini, Alberto Borghetti |
|---|---|
| Přispěvatelé: | A. Piantini, Piantini A., Borghetti A., Nucci C.A. |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Computer science
Power network Protection apparatu Line flashover Power supply quality and harmonic Protective measure Lightning protection Surge arrester Ground Power system quality Electrical engineering Hybrid configuration High voltage Arrester Dielectric breakdown and discharge Flashover Power distribution protection Lightning electromagnetic environment Overhead power line Medium-voltage overhead power distribution system Distribution network Lightning performance Lightning strike Lightning return stroke Lightning overvoltage Line insulation High ground flash densitie Lightning interaction Soil resistivity Electromagnetic environment Direct lightning strike Voltage waveshapes MV system Overhead distribution line Periodically grounded shield wire Power overhead line Electric power system MV distribution line Line conductor Grounding spacing business.industry Overvoltage protection Power supply quality Lightning Overhead MV line Power distribution line High voltage line Lightning-caused power interruption Ground resistance Overhead line conductor business |
| Zdroj: | Lightning Interaction with Power Systems-Volume 2: Applications ISBN: 9781839530920 |
| Popis: | Distribution lines located in areas with high ground flash densities are prone to lightning-caused power interruptions. Lightning overvoltages can be produced on medium-voltage (MV) systems when lightning hits either the line conductors (direct strokes) or a point in the vicinity of the distribution network (indirect strokes). The evaluation of the lightning electromagnetic environment is essential to mitigate its effects and improve the power system quality. This chapter presents initially, using the concepts given in Chapter 5 of Volume 1, a procedure for the estimation of the mean annual number of direct lightning strikes to a given overhead distribution line. Then, the basic features of the lightning overvoltages are discussed. Although some typical characteristics can be identified, the analysis of the overvoltages depends on various parameters relevant to the adopted model of the lightning return stroke, soil and power network. The influences of the most important ones are discussed in this chapter, with examples of measured and calculated voltage waveshapes. Then, the main protective measures that can be applied to improve the lightning performance of MV distribution lines, namely the increase of the line insulation withstand capability, the use of periodically grounded shield wires and the installation of surge arresters along the line, are addressed. The analysis of the effectiveness of each measure as a function of the type of phenomenon (direct or indirect strikes) and of various parameters, such as the soil resistivity, ground resistance and grounding spacing, is performed. After that, the procedure presented in Chapter 1 of this volume for estimating the mean annual number of line flashovers that an overhead MV line can experience, is applied to the case of lines with different protective measures and the relevant performances are compared. The case of urban lines, whose performance is affected by the presence of buildings in their vicinity, is also dealt with, as well as the case of hybrid configurations, in which MV and high voltage (HV) lines share the same structures. |
| Databáze: | OpenAIRE |
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