The economic feasibility of four-phase AC overhead connections
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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.Keywords:
Overhead line
Investment
Three-phase
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.
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DOI: 10.1049/cp.2009.0671 ISBN: 978 1 84919 126 5 Location: Prague, Czech Republic Conference date: 8-11 June 2009 Format: PDF With the development of cities and electric power industry, the power frequency electric field and environmental impact assessment near to the buildings under the high voltage overhead lines have caused wide public concern. In this paper charge simulation method is employed to analyze the distribution of electric field near the typical building in Shanghai under the transmission lines. And some measures to the buildings under the transmission line validate the results. At last, a comparison is made between methods to decrease the electric field surrounding the buildings under the high voltage overhead lines. (4 pages) Inspec keywords: power overhead lines; electric fields Subjects: Overhead power lines
Overhead line
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The paper presents an industry-validated technique for analysing the technical state of overhead power transmission lines and forecasting their residual life with the ability to predict their repairs and maintenance schedule. The authors propose a new approach to overhead lines technical state identification based on the analysis of its components: towers, conductors and insulation nodes. Also, within the study, an indirect method for assessing the wear indicator of overhead power transmission lines has been developed, taking into account the previously carried out replacement of its elements and components. The feasibility of extending the life of the overhead power transmission line components based on residual life assessment methods is justified. The developed methodology is intended to energy utilities as well as to engineering supervision organisations performing overhead power transmission lines surveys. Novel recommendations are formulated to assess the overhead transmission lines wear.
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Power transmission
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The condition monitoring of overhead lines is a central task of network operators. The monitoring of overhead line currents, e.g., with overhead line indicators, is already state of the art. Due to the increase in the number of decentralized generators, the power flow is not more uni-directional. As a consequence, the direction of fault currents can no longer be determined in a simple manner, as knowledge of the overhead line voltage is required to determine the power flow direction. This paper presents a sensor concept with a calculation method to detect the high voltage of an overhead line using sensors which are galvanically isolated from the ground potential. The new method has been successfully verified with measurements on a simulated overhead line in HV labs.
Overhead line
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Galvanic isolation
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The fact that overhead lines are exposed to external effects aggravate to provide healthy operating conditions, especially during winter months. Ice load consists of one of the most important problems overhead line network during the winter months. Aside from problems such as conductor breaking due to ice load, to solve these problems can take a long time due to climatic and geographical conditions. During this time, the consumers remain without electricity. In this study, algorithms and analysis studies were accomplished to predict and prevent icing on MV overhead lines. The output of the algorithm was tested under the real operational conditions in the field and it was observed that studies to predict and prevent icing yielded successful results.
Overhead line
Line (geometry)
Aside
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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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This article is devoted to the investigation of lightning protection of 110 kV overhead power line with composite supports. The aim is to determine the lightning resistance of an overhead line with composite supports by comparing the number of line breaks caused by lightning with a similar parameter for conventional support types. The concept of lightning resistance of overhead lines and peculiarities of line design, on which this parameter depends, are given. I calculated the number of line breaks in lightning strikes in different parts of the overhead line for three types of supports - composite, metal and reinforced concrete.
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Lightning
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Due to the recent situation in the neighbouring countries, where icing damaged many transmission and distribution power lines and caused financial losses, it is necessary to operate weather stations. Last icing events caught the overhead power line operators unprepared because they occurred in locations where the design did not expect any icing. The contribution summarizes the knowledge on the effect of wire diameter upon the thickness of icing on overhead transmission lines.
Overhead line
Line (geometry)
Power transmission
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