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Uppdate and improvement of the mains selectivity in Edsbyn & Ovanåker.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2018 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Abstract

A power failure can lead to major financial losses for companies and industries. To prevent unnecessary power outages, selectivity of the mains relay protection is established. This means that the malfunctioning part is disconnected from the working network. Inadequate selectivity of the mains relay protection can also lead to personal danger, the equipment takes unnecessary damage and a major part of the power grid is affected by a minor fault. Electricity distribution companies therefore have selective plans where a summary is made of the short circuit currents and disconnection times for the relay protections in their own grid.

Edsbyns Elverk AB is a privately-owned electricity company, currently owned by approximately 600 shareholders. The business consists of production, sales and distribution of electricity in an efficient manner, within the county of Edsbyn and Ovanåker.

Development and changes to the electric grid means that updates must be made for the existing selective plan. This may lead to changes for the relay current and time settings. These types of changes will be highlighted during the work and possible solutions will be presented. This work has been done as a degree project for a bachelor’s degree in the field of energy engineering.

The work shows that improved selectivity can be achieved for three of the eight outgoing electrical compartments, that if relay protection settings are changed and updated according to current operating conditions. Recommendations have been presented in charts where the settings of time and current have been drawn. These have been made for two conditions, recommended times and currents as well as previous settings. The result can then be compared and motivate a change for the old relay settings.

Place, publisher, year, edition, pages
2018. , p. 29
Keywords [sv]
elkraft, elnät, selektivplan, reläskydd
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-152101OAI: oai:DiVA.org:umu-152101DiVA, id: diva2:1251332
External cooperation
Elektra-nät
Subject / course
Energiteknik
Educational program
Bachelor of Science Programme in Energy Engineering
Presentation
2018-06-05, Ta305, Håken Gullessons väg 20, Teknikhuset, Umeå universitet, 901 87 Umeå, Umeå, 14:00 (Swedish)
Supervisors
Examiners
Available from: 2018-10-01 Created: 2018-09-26 Last updated: 2018-09-28Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
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Output format
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