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  • VIEWS & OPINION: more >>

  • LIGHTING: more >>

    • Narrow red phosphor technology

      Information from Lumileds

      An approach to enable high efficacy, high colour rendering performance LEDs. LEDs are used widely for solid state lighting (SSL). While LEDs have improved tremendously in efficacy and cost over the past decade, they must also meet end-user expectations in other aspects to expand market penetration and to realise the full energy saving potential of […]

    • Lighting for a stage production

      by Gerda Kruger, Philip Kruger Consulting

      Lighting designer Gerda Kruger discusses the technical aspects of lighting the stage play, A woman in waiting, and discusses lighting products, design solutions and challenges in the field of stage lighting. The play, A woman in waiting is based on the life and times of Thembi Mtshali-Jones. Written by Yaël Faber, in collaboration with Mtshali-Jones, […]

    • Thermal management of LEDs: Looking beyond thermal conductivity values

      by Jade Bridges, Electrolube

      The application of formulated chemical products for thermal management within the rapidly expanding LED industry. Chemical products are used widely in the electronics industry for a vast array of applications. Whether it is during printed circuit board manufacture or for the protection of components or complete devices, these products have become an essential factor in […]

  • SWITCHGEAR & DRIVES: more >>

    • Transformer-free MV variable speed drives offer size and cost reduction

      by Mike Rycroft, EE Publishers

      A problem with modern drives using high speed switching devices is the presence of common mode voltages (CMVs) in the variable frequency drive (VFD) feed. Doing away with the isolation transformer reduces the size, weight and cost of the VFD. While the electronics involved are more complex and therefore more costly, the overall benefits outweigh […]

    • How service-oriented drive deployments improve VSD driveline uptime

      by Philippe Hampikian, Schneider Electric

      This article examines how the intelligence within variable speed drives (VSDs) can be leveraged to perform predictive maintenance to improve plant uptime. VSDs were introduced to the market several years ago and have since proliferated across many industries. Despite their popularity, much work still needs to be done to fully integrate these technologies to develop […]

    • Selection of AC induction motors for cement plant applications

      by Barton Sauer, Siemens

      The selection of AC induction motors for cement mill applications, with reference to fan, kiln and vertical mill applications. Although motors may appear to be the least complicated component in the specification of cement mill equipment, cement plant applications present an immense matrix of application criteria to specify, design and build motors properly. Operating conditions […]

  • MECHANICAL TECHNOLOGY: more >>

    • Selection and use of grinding wheels

      by AG Gardner, 1965

      Of the three main abrasive processes, grinding, lapping and honing, the operation of grinding has by far the widest application in engineering production. Grinding is usually understood to mean the use of solid abrasive wheels to shape or finish material. Lapping and honing are used as fine shaping and finishing processes involving the removal of […]

    • Finite element analysis for engineers

      Information from Siemens

      Advancements in computing hardware and software have made possible product lifecycle management through effective integration of CAD and computer-aided engineering. In the past, computer-aided design (CAD) and computer-aided engineering (CAE) systems were used only by large engineering firms that could afford the software. Today, product lifecycle management (PLM) software and the hardware required to run […]

    • Measuring shaft HP without slip rings

      Information from ICMEESA

      The torque in a ship’s propeller shaft can be measured without slip rings and recorded remotely with an instrument system developed by Shell and based on the use of two vibrating wire strain gauges. The efficient operation of a fleet of ships requires the services of an experienced trials team, both to verify the performance […]

  • INSTALLATION & CONTRACTING: more >>

    • Assessing the performance of a 500 kWp solar PV plant after one year in operation

      by Jaco Bergh, Brand Engineering

      Assessing a 500 kWp photovoltaic (PV) plant to provide a simplistic approach to determine the performance which PV plants can achieve after a certain period in operation. The 500 kWp PV plant discussed in this article operates in the Northern Cape and has been in operation for over a year. The plant was commissioned by […]

    • Seasonal variation of soil resistivity and the correction factor

      by Christy Thomas, Eskom

      Soil resistivity is one of the main factors influencing the earth grid design and is measured to determine the actual value for the in situ soil under prevailing weather conditions. Soil resistivity is one of the main factors influencing the earth grid design. It is defined as the resistance between opposite faces of a cube […]

    • Preparing for absence of voltage testing

      by James White, Shermco Industries

      Placing electrical equipment or systems in electrically-safe work conditions may seem simple, but there are several factors to consider. Proper planning and preparation will make any type of testing simpler and safer. Having to stop work to fetch other tools or test instruments interrupts focus and can contribute to accidents. Traffic in the area can […]

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