Prospects For Implementing Multiple Circuit Supporting Towers On High Voltage Transmission Line In Ethiopia

Currently Ethiopia is under growing economy related to infrastructure, agriculture as well asrnindustry parks. And for all these activities electric power is very essential to execute the saidrnworks effectively. On current basis, there are numerous power transmission and substationrnconstruction projects that have been executed and also on progress which are intended to fulfillrnthe demands of the society by supplying the needed power for its intended purpose.rnAmong the works that contribute for the growing economy in Ethiopia is, the construction ofrnpower plants, which can generate up to 6450MW, dispersed all over the country. A goodrnexample will be the Grand Ethiopian Renaissance Dam Project. This power generated fromrnsuch sources should be transmitted to the intended destination (like industries, city electricalrnsystems, etc…) successfully and cost effectively. Meanwhile, it is observed that only singlernand double circuit steel tower structures being used in Ethiopia which for the growing demandrnof the society, related to power, implementation of modified steel structures that can carryrnmany conductors will be of great help in relation to construction cost as well as effectivenessrnespecially in Urban area.rnThis paper studies the prospects in instigating Multi – Circuit steel tower structures to therncurrent practice in Ethiopia. And accordingly about 9.5% gain on material, transportation asrnwell as construction cost was seen comparing two 500kV double circuit transmission line withrnthe proposed ideal 4 – Circuit carrying transmission line assuming almost suave terrain. Inrnaddition to that, more than 50% benefit was also observed from the analysis with regards to thernright of way compensation cost. Besides, while comparing suspension (00 – 20), tension (00 –rn300) and angle towers (300 – 600) between single and double circuit 132kV and 230kVrntransmission line projects constructed in Ethiopia, more than 50% saving in weight has beenrnobserved for suspension towers of both 132kV and 230kV lines. And while implementingrnMulti – Circuit tower structures maintenance difficulty as well as security issues (i.e. regardingrntheft against members of the tower) should also be given due attention. Above all the findingsrnof this paper will be expected to assist as an additive in the creation of an Ethiopian CodernStandards for the planning, modeling, analysis, design, detailing and erection of powerrntransmission structures.

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