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Hjälpkraftsystem med två lågspänningsnivåer
KTH, School of Electrical Engineering (EES), Electric Power Systems.
2008 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Because of increasing demand of power on Malmbanan the capacity of the existing wires which supply the trains must be increased. This increases the stress on the existing poles and for this reason the system for supplying the loads along the railway is to be removed from the poles and be replaced by some other system. This thesis is a study on a two-level low voltage (1 kV and 0.4 kV) electrical system with the aim to investigate if it can be an alternative to the system used today taking into account the voltages, fault currents and costs.

In this thesis the following tasks have been performed:

� Gathering of data

� Description of basic theory

� Loadow and fault current calculations of the system with MATLAB

� Life Cycle Cost estimate of the system

� Analysis and conclusions from the results

The results show that the new system can be an alternative to replace today's system. The simulations and calculations show that the voltage drop is at an acceptable level and that the fault currents are large enough to supply a safe disconnection if a fault occurs at the far end of the system.

Place, publisher, year, edition, pages
2008. , 61 p.
EES Examensarbete / Master Thesis, XR-EE-ES 2008:005
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-118951OAI: diva2:609201
Educational program
Master of Science - Electric Power Engineering
Available from: 2013-03-12 Created: 2013-03-04 Last updated: 2013-03-12Bibliographically approved

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