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Planerade arbetens påverkan på SAIDI: analys baserad på Vattenfall Eldistribution AB:s nät
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
2019 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Planned work’s affect to SAIDI : analysis based on Vattenfall Eldistribution AB’s grid (English)
Abstract [sv]

Det här examensarbetet är utfört på uppdrag av Vattenfall Eldistribution AB och utfördes på deras kontor i Trollhättan. Syftet med projektet var initialt att påvisa att den idag planerade vägen till SAIDI-målet år 2025, troligen kommer att te sig annorlunda jämfört med de ursprungliga målen. Detta på grund av alla investeringar som görs i elnätet. Med dessa investeringar följer många driftorder, vilket ofta innebär planerade avbrott för kunderna. Det som undersöks är de eventuella störningar som kan kopplas till ett planerat avbrott. Det vill säga, om det har blivit ett följdfel på grund av ett planerat arbete, vilket orsakat ett kundavbrott som varade i minst tre minuter utöver den planerade avbrottstiden. Enligt Energimarknadsinspektionen delas begreppet elkvalitet upp i två olika parametrar; leveranssäkerhet och spänningskvalitet. Detta arbete fokuserar endast på leveranssäkerhet, närmare bestämt de långa avbrotten, vilket innebär avbrott som varar längre än tre minuter. För att elnätsbolag ska kunna jämföras finns det ett antal olika avbrottsindikatorer som exempelvis SAIDI och SAIFI. SAIDI är ett mätetal som fås fram genom kvoten mellan antalet kundavbrottsminuter och det totala kundantalet. Det resultat som framkommit går inte att rättvist jämföra med de historiska SAIDI-resultat som Vattenfall Eldistribution AB presenterar, då olika varianter av SAIDI används. Resultatet visar dock att en betydelsefull påverkan på SAIDI fås på grund av att det uppstår följdfel vid vissa kopplingar som görs i nätet, i samband med planerade arbeten. Dessa följdfel kan exempelvis bero på att en frånskiljare går sönder, fel i dokumentationen vilket leder till att fel apparat manövreras eller på grund av den mänskliga faktorn.

Abstract [en]

This thesis is made on behalf of Vattenfall Eldistribution AB and was conducted at their office in Trollhättan. The purpose of the project was initially to reveal that the way to the 2025‘s SAIDI-goal, probably will deviate from the original goal. This because of the many investments that are made in the power grid. These investments often lead to many switching schedules which often, for the customers, mean a planned interruption of the power supply. What is to be investigated is if there are any disturbances which are related to a planned interruption. Namely, if there was a secondary fault caused by the planned work, that caused a customer interruption that lasted longer than three minutes aside from the planned interruption time. According to Swedish Energy Markets Inspectorate, the concept of power quality divides into two different parameters; continuity of supply and voltage quality. This work will only focus on the continuity of supply, more particularly the interruptions which last more than three minutes. To enable comparison between electrical companies there are a few interruption indicators which for example are SAIDI and SAIFI. SAIDI is the quota of the total customer interruption time and the total customer quantity. The result that has been shown is not comparable to the historical SAIDI-results which Vattenfall Eldistribution AB presents, since different variations of SAIDI is being used. The result shows that a meaningful impact is to be received because of secondary faults occurring with some of the switching done in the grid, due to planned work. These faults could for example be rooted in a disconnector failing, flaws in the documentation that lead to manoeuvres of the wrong device, or simply because of the human factor.

Place, publisher, year, edition, pages
2019. , p. 43
Keywords [sv]
Eldistribution, elnät
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hv:diva-14250Local ID: EXH300OAI: oai:DiVA.org:hv-14250DiVA, id: diva2:1339708
External cooperation
Vattenfall Eldistribution AB
Subject / course
Electrotechnology
Educational program
Elektroingenjör - Elkraft
Supervisors
Examiners
Available from: 2019-08-19 Created: 2019-07-30 Last updated: 2019-08-20Bibliographically approved

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