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Beredning och beräkning av elnät i Bäckefors
University West, Department of Engineering Science.
2024 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Preparation and calculation of power grid in Bäckefors (English)
Abstract [en]

This thesis describes the course of action for a preparation work in an area of Bäckefors inthe municipality of Bengtsfors. The preparation work is executed by Vinnergi AB at therequest of Två Grävare and covers a countryside power grid 0,4 kV/12 kV. The project has been developed by Vattenfall eldistribution who has identified the need to weatherproof and strengthen the power grid in this area in Bäckefors. The preparation work concerns 8 clients and consists of a reconstruction where parts of the power grid consist of old overhead powerlines. The reconstruction covers the demolition of 1,8 km overhead power lines, 1,4 km underground power lines, 1 ground substation including transformer, 1 pole substation including transformer and 1 cable distribution cabinet which will be replaced with 2,9 km underground medium-voltage cables, 1,1 km underground low-voltage cables, 3 new substations and 2 new cable distribution cabinets. As a result of the reconstruction the power grid will be weatherproof as well as the quality improved and the low-voltage part of the power grid will be isolated. The preparation work includes a field visit, contract- and permit tasks, map drawing, cost calculation as well as calculation of voltage drop and trigger time.

This preparation work is executed in parallel with the preparation work of Vinnergi which means that permits and contact with landowners is carried out by Vinnergi. Vattenfalls draft of the cable routing has been used as basis but has been partially changed following suggestions from Två Grävare and Vinnergi. An example of a modified cable routing where Vinnergi has chosen their own option is a drilling under the road by a bedrock. Vattenfalls suggestion of cable routing stretches across the bedrock and Två Grävares suggestion is tocross earlier along the road. After a field visit the suggestion of the preparer to cross the roadby the bedrock turned out to be the most appropriate alternative.

The total cost of the project is estimated to 1,7 million SEK. The cost is calculated based onthe EBR cost index, where Vinnergi has created a template of their own based on what specifically is included in their projects.

Place, publisher, year, edition, pages
2024. , p. 25
Keywords [en]
preparation, calculation, power grid
Keywords [sv]
beredning, beräkning, elnät
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hv:diva-21328Local ID: EXH300OAI: oai:DiVA.org:hv-21328DiVA, id: diva2:1841346
Subject / course
Electrical power technology
Educational program
Högskoletekniker, elkraft
Supervisors
Examiners
Available from: 2024-03-01 Created: 2024-02-28 Last updated: 2024-03-01Bibliographically approved

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