Calculation of Electric Field and Temperature of Overhead Transmission Lines with Covered Conductors
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Due to advantages of increase of safety and reduction of short circuit, overhead transmission lines with covered conductors have spread gradually. Analytical expressions of electric field to overhead transmission lines with covered conductors are presented. Calculation methods of allowable current and temperature to covered conductors are presented. Calculations of electric field and temperature of overhead lines with bare and covered conductors are taken. Results show differences of electric field and temperature to overhead lines with bare conductors and covered conductors.Calculation of Electric Field and Temperature of Overhead Transmission Lines with Covered Conductors
Due to advantages of increase of safety and reduction of short circuit, overhead transmission lines with covered conductors have spread gradually. Analytical expressions of electric field to overhead transmission lines with covered conductors are presented. Calculation methods of allowable current and temperature to covered conductors are presented. Calculations of electric field and temperature of overhead lines with bare and covered conductors are taken. Results show differences of electric field and temperature to overhead lines with bare conductors and covered conductors.
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Four separate models have been developed during the past thirty years to account for the electrical, mechanical and thermal aspects of the behavior of stranded overhead conductors. Each model contains a number of variables, and some of these variables are common to two or more of the models. Hence, the design of overhead line conductors is usually undertaken in a rather piecemeal fashion. This paper describes the unified model, which incorporates electromagnetic, mechanical, and radial and steady-state thermal models. An example is given of the design of an ACSR conductor.< >
Overhead line
Line (geometry)
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In terms of the requirement for construction of resource-conserving type of transmission lines during the 11~(th) Five Year Plan,the author of this paper made a detailed comment on the existing conductors and those newly developed conductors at home and abroad in recent years for their properties and applications and suggested that for the conductors for main lines,the focus should be on energy-saving and saving the land for power lines and the possibility of safe operation under the N-1 condition;for the conductors for renovation of old power lines,the focus should be on the sag characteristics with increased capacity due to renovation.The author presented the production,R D and scale of the conductors for transmission lines in China and the principle for R D of new conductors,indicating innovation is of most importance.
Power transmission
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During the process of power system construction, whether overhead transmission lines can be stable operation has a direct influence on the quality and safety of electricity used by residents enterprises. Therefore, while attaching importance to the supervision of power system in our country, regular or irregular inspection work for overhead transmission lines will be actively organized. This can not only develop the security risks of the potential as soon as possible and formulate an effective solution. It can also ensure the safety and stability of overhead transmission lines. After understanding the basic concept of unmanned aerial vehicle (UAV) and its control inspection technology, this paper analyzes how to reasonably apply unmanned aerial vehicle (UAV) in the inspection work of overhead transmission lines based on the accumulated experience in recent years, so as to provide basic guarantee for the operation of Chinese power system.
Overhead line
Power transmission
Line (geometry)
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The aim of the article is to determine, by experiment on large-scale models, the probability of direct lightning strikes in overhead lines with protected wires for different model configurations. The experimental results have allowed to refute the hypothesis of the absence of direct impacts in protected wires of overhead lines. The studies conducted suggest that lightning defeat of overhead lines with protected wires is substantially lower than that traditional lines.
Lightning
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The goal of this paper is assessing the economic feasibility of four-phase AC overhead connections, i.e. the real chance that such lines have of being competitive with commonly-used solutions for power transmission. For this reason, the paper illustrates an economical comparison among innovative 325 kV four-phase ac lines, traditional 400 kV three-phase ac lines and increasingly-popular 500 kV HVDC lines. These systems are considered firstly in single-circuit and secondly in double-circuit overhead arrangement. The comparison is based on the main cost items that characterize these lines, namely investment costs, energy losses costs and reliability-related costs. The uncertainty of the relevant parameters, particularly significant as far as innovative four-phase ac lines are concerned, is also discussed.
Overhead line
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Three-phase
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The goal of this paper is to develop a technical comparison among different possible solutions for overhead transmission lines. These include both traditional and innovative solutions: the former are usual three-phase AC lines and HVDC lines, the latter are four-phase AC lines and combined AC-DC lines. A technical-economical comparison between aerial standard three-phase AC and innovative four-phase AC lines has been already developed in, where the possible scope of convenience of the four-phase solution has been individuated. This paper first illustrates the main characteristics of the four considered solutions, pointing out the technical advantages provided by each one. Secondly, the paper performs a more detailed comparison based on a probabilistic analysis of the transient stability performances of the considered alternatives.
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Transient (computer programming)
Three-phase
Overhead line
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Abstract The constantly growing demand for electricity demands both on the installed power of energy sources and on the transmission capabilities of electrical networks. Considering the fact that increasing the transmission capabilities of electrical networks by building new lines is a time and financially demanding process, network operators strive to use the transmission capacities of existing lines as much as possible. One of the possibilities of this maximum use of existing capacities is the application of the calculation of the dynamic ampacity of the lines, when the operators of electric networks know how to determine the maximum load capacity of the lines depending on the current climatic conditions. The presented publication presents a methodology for determining the dynamic ampacity of overhead power lines under different climatic conditions with the subsequent application of this methodology to a specific conductor used in the implementation of overhead transmission lines.
Ampacity
Overhead line
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Forest Fire can cause a serious damage to overhead conductors. Therefore, the detailed investigation for the changes of mechanical and electrical properties of damaged conductors should be carried out to understand the effect of forest fires on conductors. This is very much important to maintain transmission line safely. Oxidation of overhead conductor was increased with temperature and time(maximum time : 30min). Conductivity of Al conductor was decreased by Agents. The detailed will be given in the text.
Overhead line
Line (geometry)
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