Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Åsktransienter och överspänningar: En spänningsfylld simulering av elkraftsystemet vid Forsmark 3
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2014 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A power system will inevitably be subjected to transient overvoltages, most often produced by switching operations and lightning strikes. These transient overvoltages may harm sensitive equipment without sufficient protection, but it is not an easy task to predict what transients may occur or how they affect the system. A fault occurred in a low voltage system at Forsmark 2012 and overvoltages from lightning were concluded as the probable cause. The three aims with this thesis are to develop and test a model of the power system at Forsmark 3, analyse the transient behaviour of the system when subjected to lightning surges and identify critical parameters, and lastly to provide a tool for investigating the protection of the system. The modelling and simulations were performed in the freely available simulation program LT Spice. Challenges and difficulties have been to obtain parameter values for components that are relevant for the high frequencies produced by the short rise time in lightning surges. The main conclusions are: the maximum current in the lightning discharge has the largest impact on the system voltages and surges in the external grid can produce standing waves in the system, causing significant overvoltages even in low voltage systems. The simulations produced larger overvoltages than would occur in a real system, which also would dampen the high frequency signals to a larger extent. Further work to obtain models better suited for high frequency simulation is suggested.

Place, publisher, year, edition, pages
2014. , 33 p.
Series
UPTEC ES, ISSN 1650-8300 ; 14034
Keyword [sv]
kraftsystem, simulering, transient, överspänning, åska
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-231271OAI: oai:DiVA.org:uu-231271DiVA: diva2:744062
External cooperation
Forsmark Kraftgrupp AB
Educational program
Master Programme in Energy Systems Engineering
Supervisors
Examiners
Available from: 2014-09-11 Created: 2014-09-05 Last updated: 2014-09-11Bibliographically approved

Open Access in DiVA

EXAMENSARBETE ERIK AHLSTRÖM(2648 kB)441 downloads
File information
File name FULLTEXT01.pdfFile size 2648 kBChecksum SHA-512
22c7dc9733744543a1d88337510e1b8ab5a8e4b745e5d3b5a97c197c6b9dcc68c7684be1e753afdbc0bb1b79d9ad03810bfd240f37c36b5a264f8309bf604e9a
Type fulltextMimetype application/pdf

By organisation
Electricity
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 441 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 1012 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf