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Transient control in low-voltage power installation networks and electronic systems
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of High Voltage Research.
1997 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Transient protection in a low-voltage power installation network and an electronic system isof vital importance since most of the activities of our society are very dependent on thereliability of low-voltage power installation networks and electronic systems. This thesisconcentrates upon several investigations which all deal with the evaluation and improvementof the protection measures of low-voltage power installation networks and electronic systemsagainst electrical transients.

Different components of transient protection circuits, such as varistors, gas dischargeprotectors and shielded cables, and their co-ordination in complex protection circuits havebeen experimentally investigated. The transient response of an individual protectioncomponent together with a complex protection system is discussed. Using a direct "high-level" current injection, a shielded system including non-linear circuit components wasevaluated experimentally. Based on the theoretical analysis, self-consistent time domainmodels of the varistor, the gas discharge protector, the power installation cable and theshielded cable were developed and implemented under the Alternative Transients Program -Electromagnetic Transients Program (ATP-EMTP). A good agreement was obtained incomparing the measured and the calculated results even for a complex protection circuit. Themodels developed in this thesis are shown to be a very efficient tool in the evaluation ofprotective measures in low-voltage power installation networks and in electronic systems.Different protection schemes for a protection circuit are also discussed in this thesis.

A mid-plane triggered spark gap trigatron was also theoretically and experimentallyinvestigated. On the basis of these investigations, an optimised trigatron spark gap wasdeveloped and used in the construction of a new low impedance impulse current generatorwhich was used in the experiments described in this thesis.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 1997. , 59 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 297
Keyword [en]
Physics, Transient protection, varistor, gas discharge protector, shielded cable, low-voltage power installation, ATP-EMTP, spark gap, current generator
Keyword [sv]
Fysik
National Category
Physical Sciences
Research subject
Electricity, Esp The Study Of Transients and Discharges
Identifiers
URN: urn:nbn:se:uu:diva-113ISBN: 91-554-4006-1 (print)OAI: oai:DiVA.org:uu-113DiVA: diva2:160677
Public defence
1997-09-24, lecture hall at the Institute of High Voltage Research, Uppsala University, Uppsala, 10:15
Available from: 1997-09-03 Created: 1997-09-03Bibliographically approved

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