SITING OF TRANSMISSION LINE USING G1S

Abstract

The demand of power has increased manifold in the last few decades and thus there is requirement for developing power transmission systems to follow up with the rapid growth. In the site evaluation process for transmission line, it is necessary to carefully consider not only technical issues, but also the impact on natural environment, the influence on local communities, and various regulations. However, it is getting difficult to find the preferable site for a transmission line, be cause of the increasing cost of constructions, the increasing concern on environmental issues and the growing consciousness of land owners. To solve those problems, a computer system has been developed employing GIS technology. The new methodology for automated route selection for the construction of new power lines, based on geographic information systems (GIS). It uses a dynamic programming model for route optimization. Environmental restrictions are taken into account together with all of the operating, maintenance, and equipment installation costs, including a new approach to the costs associated with the slope of the terrain crossed by the power lines. GIS platform is used for the selection of the minimum cost route as well as its economic corridor, where geographic data (installation, maintenance, operation costs, land use, etc.) and computing results are represented in raster format instead of vector format. The raster format allows adopting dynamic programming for all of the studied geographic areas. The most Significant challenge for a transmission system and line designer is to achieve an economical design while meeting many diverse requirements and constraints. After recognition that a transmission facility is needed, a coordinated effort providing for this need is accomplished through long range transmission planning. When selecting a support structures, the design engineer will try to utilize available design to avoid the expenditures for a new tower family including the workshop drawings, especially in case of relatively short lines. From the technical point of view, a line route should be selected which avoid angle points, as far as possible, since they require considerably higher efforts and investments. A tower configuration as uniform iii as possible should be selected. An easy access to the tower sites reduces compensation for land use and maintenance costs. Tower sites on exposed points of the terrain, such as rock noses, should be avoided although they offer advantages concerning the adjustments of the conductor catenary to the terrain. In this dissertation, a Geographic Information System(GIS) application has been developed using MATLAB for the selection of optimal route and siting of the transmission line towers along the route so that overall cost of the project is minimum. Remote sensing is the most cost-effective source of information for updating a GIS and it is a valuable source of current land use/land cover data. This is done through satellite imagery, Arial photography etc. In this dissertation work satellite Imagery was taken as the data source for GIS. In this Integrated system between GIS and MATLAB has been designed. The GIS gives the complete profile of the pre selected routes. This profile is stored in the tabular form. Using the MATLAB the transmission line tower are sited which satisfies the design constraints so that the overall cost of the project is minimum. The output obtained from the above algorithm which satisfy the constraints are plotted in three dimensional view in MATLAB. This output has also been interfaced with a GIS platform for easier display, analysis and assimilation. ArcView 3.0 has been used for developing the display of all the above data collected including development of attributes databases for the same. The data also specifically includes the latitudes and longitudes of each site locations.