Prospects for Implementing Multiple Circuit Supporting Towers on High Voltage Transmission Line in Ethiopia
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Date
2018-07
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Addis Ababa University
Abstract
Currently Ethiopia is under growing economy related to infrastructure, agriculture as well as
industry parks. And for all these activities electric power is very essential to execute the said
works effectively. On current basis, there are numerous power transmission and substation
construction projects that have been executed and also on progress which are intended to fulfill
the demands of the society by supplying the needed power for its intended purpose.
Among the works that contribute for the growing economy in Ethiopia is, the construction of
power plants, which can generate up to 6450MW, dispersed all over the country. A good
example will be the Grand Ethiopian Renaissance Dam Project. This power generated from
such sources should be transmitted to the intended destination (like industries, city electrical
systems, etc…) successfully and cost effectively. Meanwhile, it is observed that only single
and double circuit steel tower structures being used in Ethiopia which for the growing demand
of the society, related to power, implementation of modified steel structures that can carry
many conductors will be of great help in relation to construction cost as well as effectiveness
especially in Urban area.
This paper studies the prospects in instigating Multi – Circuit steel tower structures to the
current practice in Ethiopia. And accordingly about 9.5% gain on material, transportation as
well as construction cost was seen comparing two 500kV double circuit transmission line with
the proposed ideal 4 – Circuit carrying transmission line assuming almost suave terrain. In
addition to that, more than 50% benefit was also observed from the analysis with regards to the
right of way compensation cost. Besides, while comparing suspension (00 – 20), tension (00 –
300) and angle towers (300 – 600) between single and double circuit 132kV and 230kV
transmission line projects constructed in Ethiopia, more than 50% saving in weight has been
observed for suspension towers of both 132kV and 230kV lines. And while implementing
Multi – Circuit tower structures maintenance difficulty as well as security issues (i.e. regarding
theft against members of the tower) should also be given due attention. Above all the findings
of this paper will be expected to assist as an additive in the creation of an Ethiopian Code
Standards for the planning, modeling, analysis, design, detailing and erection of power
transmission structures.
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Keywords
Towers on High Voltage Transmission