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Ömsesidig koppling mellan parallellgående friledningar
KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
2015 (Swedish)Independent thesis Basic level (university diploma), 180 HE creditsStudent thesisAlternative title
Inductive Coupling Between Parallel Overhead Power Lines (English)
Abstract [sv]

Parallellgående kraftledningar inducerar spänning i varandra som i sin tur driver en ström. I denna rapport utreds hur osymmetriska kortslut-ningar på en kraftledning påverkar strömmen i en parallellgående kraft-ledning på grund av ömsesidig induktion och vilka faror inducerad spän-ning och den av inducerade spänningen drivna strömmen kan leda till, ur hänsyn till leveranssäkerhet samt underhållsarbetare på parallell kraft-ledning.Målet med examensarbetet är att öka noggrannheten för felströmsberäk-ningar på Vattenfalls elnät samt att öka kunskapen för vattenfallpersonal om fenomenet av ömsesidig koppling och de faror den kan innebära.Rapporten kunde konstatera att ömsesidig koppling kan leda till faror för leveranssäkerheten av elnätet och att det finns ett behov av analys av specifika fall av parallella kraftledningar i Vattenfalls elnät.

Abstract [en]

Parallel overhead power lines induce voltage in one another, which in turn drives a current. In this report an investigation is made in how asymmetrical short circuits on an overhead power line influence the cur-rent in a parallel overhead power lines due to the inductive coupling be-tween the power lines and which hazards it can cause for the electrical delivery dependability as well as high voltage workers.The aim with this bachelor thesis is to increase the accuracy in fault cur-rent calculation in the Vattenfall electricity grid as well as to increase the knowledge within Vattenfall of the phenomena of inductive coupling and the hazards which comes with it.The report could ascertain that inductive coupling can lead to danger for electrical delivery dependability and that there exists a need of analysis on specific parallel overhead power lines within the Vattenfall electricity grid.

Place, publisher, year, edition, pages
2015. , 80 p.
Keyword [en]
Overhead Power Line, self-inductance, mutual inductance, symmetrical components, positive sequence impedance, zero sequence impedance, short circuit to earth, inductance, induction.
Keyword [sv]
Friledning, Själv- och ömsesidig impedans, symmetriska komponenter, plusföljdsimpedans, nollföljdsimpedans, jordfel, induktans, induktion.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-172932OAI: diva2:850780
Subject / course
Electrical Engineering
Educational program
Bachelor of Science in Engineering - Electrical Engineering
2015-02-17, Marinens väg 30, Handen, 12:14 (Swedish)
Available from: 2015-09-03 Created: 2015-09-02 Last updated: 2015-09-03Bibliographically approved

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