In high voltage networks for the transport of electrical energy, lightning, a phenomenon as dangerous as it is impressive, with an easily recognizable form, can affect a power line by striking either a phase conductor...In high voltage networks for the transport of electrical energy, lightning, a phenomenon as dangerous as it is impressive, with an easily recognizable form, can affect a power line by striking either a phase conductor, a tower or a guard cable, thus causing more dangerous and constraining stresses on the lines for its proper operation. Thus, this article aims to analyze the behavior of a HV line during an atmospheric discharge and assess the spatial and temporal distribution of the lightning current wave. For this purpose, the generalities on the transmissible power in case of link without resistance and the modeling of the atmospheric surge propagation established on the basis of the theory of the lines with distributed constants implementing the wave equation known as the Alembert equation have been developed. Through this research, we are interested in the study of the space-time distribution of the lightning current wave in order to model the radiated electromagnetic field and to examine the influence of the atmospheric discharge induced overvoltage on the transportable power of a High Voltage AC Transmission line, for a good selective protection in order to illuminate the parasites. The 2D simulation based on engineering and “Transmission Line” models have been developed as well as the verification of the coherence of the different models, by comparing the fractal dimensions of the program results with those of the experimentally obtained figures.展开更多
随着中国特高压电网的建设发展和铁塔组立施工工艺及配套施工装备技术水平的进步,以标准《750 k V架空送电线路铁塔组立施工工艺导则》(Q/GDW 112—2004)为核心逐步形成的整个架空输电线路铁塔组立施工技术标准体系存在部分内容重复、...随着中国特高压电网的建设发展和铁塔组立施工工艺及配套施工装备技术水平的进步,以标准《750 k V架空送电线路铁塔组立施工工艺导则》(Q/GDW 112—2004)为核心逐步形成的整个架空输电线路铁塔组立施工技术标准体系存在部分内容重复、衔接性差以及在实际工作中适用性差等问题。因此需要系统梳理架空输电线路铁塔组立施工技术标准体系构成及存在问题,结合现有铁塔塔型特点、组立施工工艺特点和铁塔组立施工装备能力,提出进一步优化中国电力行业架空输电线路铁塔组立施工技术标准体系的框架结构,为铁塔组立施工提供技术支撑。展开更多
文摘In high voltage networks for the transport of electrical energy, lightning, a phenomenon as dangerous as it is impressive, with an easily recognizable form, can affect a power line by striking either a phase conductor, a tower or a guard cable, thus causing more dangerous and constraining stresses on the lines for its proper operation. Thus, this article aims to analyze the behavior of a HV line during an atmospheric discharge and assess the spatial and temporal distribution of the lightning current wave. For this purpose, the generalities on the transmissible power in case of link without resistance and the modeling of the atmospheric surge propagation established on the basis of the theory of the lines with distributed constants implementing the wave equation known as the Alembert equation have been developed. Through this research, we are interested in the study of the space-time distribution of the lightning current wave in order to model the radiated electromagnetic field and to examine the influence of the atmospheric discharge induced overvoltage on the transportable power of a High Voltage AC Transmission line, for a good selective protection in order to illuminate the parasites. The 2D simulation based on engineering and “Transmission Line” models have been developed as well as the verification of the coherence of the different models, by comparing the fractal dimensions of the program results with those of the experimentally obtained figures.
文摘随着中国特高压电网的建设发展和铁塔组立施工工艺及配套施工装备技术水平的进步,以标准《750 k V架空送电线路铁塔组立施工工艺导则》(Q/GDW 112—2004)为核心逐步形成的整个架空输电线路铁塔组立施工技术标准体系存在部分内容重复、衔接性差以及在实际工作中适用性差等问题。因此需要系统梳理架空输电线路铁塔组立施工技术标准体系构成及存在问题,结合现有铁塔塔型特点、组立施工工艺特点和铁塔组立施工装备能力,提出进一步优化中国电力行业架空输电线路铁塔组立施工技术标准体系的框架结构,为铁塔组立施工提供技术支撑。
