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Propagation and mitigation of Very Fast Transient Overvoltage in Gas Insulated Substation
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Very Fast Transients are surge overvoltages created for example when opening or closing a

disconnector switch (DS). Because of the very high frequency stress they exert on the

equipment and their magnitude (up to 3 pu), they constitute an important issue in the design

of ultra-high voltage Gas Insulated Substations.

This thesis offers a general understanding of Very Fast Transient Overvoltages (VFTO or

VFT) and explores different mitigation techniques, mainly based on dissipation of the energy

associated with it.

Two solutions are mainly discussed for attenuating the VFTO: applying a semi resistive and

magnetic coating or using magnetic rings. Both rely on the non-linearity of skin effect and

magnetic losses and are treated in similar manners. An electromagnetic model of both

systems is proposed as well as a way to model the influence of the device on the transient

behaviour of the system.

The performances of both systems still have to be determined by experimentation but they

both should significantly reduce the impact of the VFTO.

Abstract [sv]

Mycket snabba transienter (eng. Very Fast Transients) är överspänningar som skapas till

exempel när en frånskiljare öppnas eller stängs (DS). På grund av de mycket högfrekventa

påkänningar som de utövar på utrustningen och deras storlek (upp till 3 pu), utgör de en

viktig fråga i utformningen av ultrahögspännings gasisolerade ställverk.

Denna avhandling ger en allmän förståelse för mycket snabba transienta överspänningar

(VFTO eller VFT) och undersöker olika metoder för dämpning, främst baserade på förlust av

energi. .

Främst diskuteras två lösningar för dämpning av VFTO: applicering av en semi resistiv och

magnetisk beläggning kring ledaren eller använda magnetiska ringar. Båda är beroende av

icke-linjäritet av strömförträngningseffekt och magnetiska förluster, båda

metodernabehandlas på liknande sätt. En elektromagnetisk modell av båda systemen föreslås

liksom ett sätt att modellera inverkan av anordningen på transienta systemets beteende.

Utförandet av båda systemen måste verifieras genom experiment, men de båda bör avsevärt

minska effekterna av VFTO.

Place, publisher, year, edition, pages
2015. , 88 p.
Series
EES Examensarbete / Master Thesis, XR-EE-ETK 2015:02
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-160516OAI: oai:DiVA.org:kth-160516DiVA: diva2:790036
External cooperation
Alstrom
Educational program
Master of Science in Engineering - Electrical Engineering
Examiners
Available from: 2015-02-23 Created: 2015-02-23 Last updated: 2015-02-23Bibliographically approved

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CiteExportLink to record
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