2/2012 - Fingrid

to be constructedto be dismantledFIRST FIELD TOWERto be erected in HyvinkääFingrid will renew the transmission lines running between Nurmijärvi, Hyvinkää and Hikiä inSouthern Finland. Proximity to urban settlement affects the way in which the transmission line isconstructed: part of the existing line will be transferred to a new route, and new types of towers willbe used to streamline the landscape. Fingrid’s first field tower will also be erected in Hyvinkää.Text by Tiina Miettinen | Photograph by Juhani EskelinenFingrid is strengthening the highvoltagetransmission system inSouthern Finland by building anew 400 kilovolt transmission line fromHyvinkää to Hikiä in Hausjärvi. The110 kilovolt double circuit line originallybuilt in the 1920s between theHikiä and Nurmijärvi substations willbe modernised at the same time, andtransmission line rearrangements willbe carried out in the Metsäkalteva areain Hyvinkää.The renewal of the transmission linebetween Hyvinkää and Hikiä is part ofthe ten-year capital investment programmein the Finnish transmissionsystem. The Hyvinkää switching plantwill be decommissioned, and line rearrangementswill be made at the Hikiäsubstation which forms a node in thenetwork. Preparations will be made atHikiä for a situation where the 400 kilovoltnetwork will be extended further toForssa and later to the east and north.The 110 kilovolt transmission line betweenHikiä and Nurmijärvi also callsfor a renewal, because the old line builtas early as the 1920s is in a poor condition.Around a new residentialarea in HyvinkääThe transmission line work will mostlytake place in existing transmission lineroutes. In some places, the new 400kilovolt transmission line will be locatedin a new route or shift slightlyat the corner points of the line. In Hyvinkää,the 400 kilovolt transmissionline will be transferred to a new routeto give way to the new residential areaof Metsäkalteva and the Kravunharjuhousing fair area.The length of the line section betweenHyvinkää and Hikiä is approx. 17 kilometresand the section between Nurmijärviand Hikiä about 29 kilometres. Thecontractor in the project is the Finnishcompany Eltel Networks Oy.The construction of the transmissionline between Nurmijärvi and Hikiä begunby foundation work in Januarythis year. The dismantling of the existingtransmission line structures and theconstruction of the new lines are progressingin stages so that the entire projectwill be ready by the end of October2013.According to Fingrid’s Project ManagerHannu Kuikka, the project adjacentto a residential area is a fairlytypical transmission line constructionproject. However, a few kilometres ofthe line will be built using new types oftower models.“We have taken the impacts on thelandscape into account near residentialareas. On the north side of the Hyvinkääsubstation, we will use streamlined conicaltube towers. They are considerablymore expensive than standard towermodels, but they are also better adaptedto the built-up landscape,” Hannu Kuikkasays.The first field tower designed for Fingridwill also be erected in Hyvinkää.“The field towers will primarily beused in the construction of new transmissionlines in field areas. A modeltower will be erected near the Hyvinkäähousing fair area in early 2013,” saysHannu Kuikka. FINGRID 2/2012 | 9