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Analys av fördelningssystem för bostadshus
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2012 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The purpose of this project is to analyze earthing systems for houses. By practical measurements and theoretical analyzes consequences of possible faults, that can occur within the facility and in the low-voltage distribution network, is illustrated.  

The reason for this project is that nowadays one has to arrange with a main equipotential bonding system for buildings. Apart from that, if necessary, bathrooms must be provided with a supplementary equipotential bonding system.

The practical measurements verify that potential differences in facilities may be due to voltage drops in the PEN conductor between the origin of the electrical installation and the power transformer.

Based on the theoretical analyzes of possible faults, it is considered that the requirement for  supplementary equipotential bonding systems for bathrooms in most cases can be questioned, when basic insulation, fault protection, residual current devise and main equipotential bonding system already provides an adequate level of protection.

A PEN conductor loss may result in a situation where metallic parts attached to the equipotential bonding system starts working as earth electrodes. Equipotential bonding system may also increase the incidence of stray currents. If TN-C-S systems is provided with a local connection to earth a redundant system against PEN conductor loss is obtained. That is not the case for neutral conductor loss in TN-S systems with a local connection to earth. If district heating pipes is supplied with insulated flanges it prevents stray currents and foreign potential to be spread in the district heating network.

Place, publisher, year, edition, pages
2012.
Keyword [sv]
Fördelningssystem, Potentialutjämning
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-60023OAI: oai:DiVA.org:umu-60023DiVA: diva2:557447
External cooperation
Tyréns AB
Educational program
Bachelor of Science Programme in Energy Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-10-05 Created: 2012-09-27 Last updated: 2012-10-05Bibliographically approved

Open Access in DiVA