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Högfrekventa övertoner i sjukvårdens elnät – utvärdering av skillnader i tid och rum
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
High frequency harmonics in the healthcare power grid – evaluation of differences in time and space (English)
Abstract [sv]

Examensarbetet går ut på att utreda hur störningsnivån varierar över tid i elnätet samt ett antal olika ställen inom Norrlands universitetssjukhus, Umeå. Elektrisk fältmätning ingick också i arbetet för att undersöka om det fanns ett samband mellan det elektriska fältet och övertoner i sjukhusets elnät.

Examensarbetet presenterar grundläggande teori om elnät, elkvalité och parametrar som beskriver elkvalité, t.ex. övertoner, flimmer och transienter. Förslag på hur övertonshalten kan reducera tas även upp.

Mätningarna av elkvalitets parametrar genomfördes med ett antal mätinstrument. Insamlat mätdata analyserades i några olika programvaror.

Undersökningen visar att övertonshalten varierade mycket över dygnet och var högst på intensivvårdsavdelning där maxvärdet på spänningsövertonshalten THDu var 4,01%. Ström, spänning och frekvens var inte stabila, dvs. transienter och flimmer har uppstått under mätningen. Analysen av mätdata visar att den totala spänningsövertonshalten THDu var under 5% och inte överskred gränsvärdet 8% som anges i standarden SS-EN 50 160.

Abstract [en]

The aim of the thesis was to examine whether the level of disturbance in the power grid vary between different types of care environment over time at University Hospital of Umeå. Electric field measurement was also included in the thesis to investigate whether there was a connection between the electric field and harmonics in the hospital’s power grid.

The thesis presents basic theory about power grid, power quality and parameters which describe power quality, such as, harmonics, flicker and transients. Suggestions on how to reduce the harmonic content will also be discussed.

The measurements of the power quality parameters were performed by using different measuring equipment. The data were analyzed using different software.

The study shows that the harmonic content often varied and was highest in intensive care unit, where the maximum value of the harmonic voltage distortion THD was 4,01%. The measurement shows that current, voltage and frequency were not stable, that is transients and flicker occurred several times during the measurement. The analysis of the data shows that the harmonic voltage distortion THDu was below 5% and never above the limit 8% which is specified in the standard SS-EN 50 160. 

Place, publisher, year, edition, pages
2016. , 22 p.
Keyword [en]
distortion, harmonics, power grid, hospital
Keyword [sv]
störningar, övertoner, elnät, NUS, Norrlands universitetssjukhus
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:umu:diva-122510OAI: oai:DiVA.org:umu-122510DiVA: diva2:939356
External cooperation
Medicinsk Teknik, Forskning och utveckling - NUS
Subject / course
Elektronik
Educational program
Bachelor of Science Programme in Electronic and Computer Engeneering/ Medical engineering
Supervisors
Examiners
Available from: 2016-06-19 Created: 2016-06-19 Last updated: 2016-06-19Bibliographically approved

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