SA nuclear industry sharply criticizes the IRP 2010-2030 Update Report 2013

  A comprehensive review commissioned by the Nuclear Industry Association of South Africa (NIASA) is sharply critical of the draft Update Report 2013 of the Integrated Resource Plan for Electricity (IRP) 2010-2030 recently issued for comment by the South African Department of Energy (DoE).   The draft IRP 2010-2030  Update Report 2013 has not yet […]

Dynamic reactive power compensation of container cranes

  Overall requirements for the reactive power compensation of a container crane vary based on overall crane size and container weights. These dynamically changing requirements affect not only the efficiency of the crane, but also put a significant strain on the local electrical distribution system. Download the PDF

Improving storage efficiency in electric buses

  The development of battery powered electric vehicles has been focused mainly on private passenger vehicles, while public transport seems to have been neglected. A reassessment of the journeys public transport vehicles make has led to the development of battery powered buses and bus rapid transit (BRT) systems. Several trial systems are in successful operation […]

Lightning and surge protection for wind turbines

  Due to their vast exposed surface and height, wind turbines are frequently hit by direct lightning strikes. Comprehensive lightning and surge protection measures are essential to maximise the return on investment and prevent downtime. Download the PDF

Solar farm harvests energy in desert wasteland

  The UAE has embarked on an ambitious programme to introduce renewable energy into its generation mix. Homes, offices and other buildings in Dubai are now partially powered by the desert sun. Phase 1, which produces 13 MW, has been completed and is in operation. This article results from a visit to the site in […]

Protecting IEDs with deviation of power frequency

  The deviation of power frequency component (DPFC) is a fundamental principle employed in many protection IEDs. This principle is based on the concept of superposition, where the pre-fault load current and voltage can be subtracted from the whole fault current and voltage to obtain the pure fault components. Download the PDF

Extending the effective life of a transformer

  Power transformers are key components in any electrical network and to ensure the safe, reliable and optimum working life of the transformer, care is required to limit insulation moisture as one of the most important parameters that cause insulation degradation and reduction in service life [1]. There are also safe limits of moisture content […]

Live-line techniques in high voltage overhead transmission line repair

  by Patrick O’Halloran, City Power This short paper covers how live-line (energised) techniques can be utilised to restore supply as quickly as possible in the event that high voltage transmission towers have collapsed. Download the PDF

Energy recovery from high pressure cold water in mines

  The mining industry in South Africa, being responsible for 18% of electricity demand, is seriously looking at alternative, more energy effective processes, without reducing output. Deep level mines require large volumes of cold water at the underground production levels. The energy consumed by these pumping installations constitutes approximately 14% of the mine’s overall demand. […]

Electromagnetic environment around HVDC transmission lines

by Matthew Sibanda and Robert van Zyl, Cape Peninsula University of Technology and Nishanth Parus, Eskom The purpose of this paper is twofold. Firstly, an overview of the interaction between high voltage direct current (HVDC) transmission lines and the environment they are operated in is presented. Secondly, the equipment required to characterise this environment is […]