Comparing harmonics mitigation techniques

  A comparison of harmonic mitigation techniques in a range of applications and settings, and theoretical and practical comparisons between active and passive series and shunt filters to reduce harmonic loading in a drive system. Harmonics in power systems are mostly caused by various semiconductor-based loads. Most common loads are drive systems (typically transistor-based variable […]

LED: what the end-user should know

  It is expected that LED lighting will account for more than half the global lighting market by 2017, making it essential for the end-user to better understand this technology. Although the cost of LED products is currently higher than regular lighting systems, the demand for LED technology is growing exponentially, which will inevitably result […]

Clever pumping: making the water industry’s pumps intelligent

  Climate change, increasing water demands and the legal obligations of the EU’s Water Framework Directive are all making the water sector an attractive arena for technologies that can help reduce costs and contribute to reducing the effects of climate change. It is against this backdrop that the demand for intelligent process control equipment is […]

Maximising surge protection safety

  Servicing surge protection devices (SPDs) safely without impacting critical operations has traditionally been difficult but a new generation SPDs is solving this problem. Servicing traditional SPDs poses serious risks to maintenance personnel and mission-critical workloads. If the SPD has an internal disconnect, power on the line side of the disconnect continues to flow even […]

South Africa’s position in the world nuclear energy picture

  From the ICMEESA archive With its uranium enrichment expertise and technology, South Africa is in a strategic position to enrich and market its uranium and, perhaps in future, to provide fuel elements for manifold identical stages. Only thirty years have passed since Enrico Fermi gave a practical demonstration of a controlled fission chain reaction […]

Three steps for reducing total cost of ownership in pumping systems

  Electrical energy cost represents some 40% of the total cost of ownership of pumping systems, yet many organisations fail to introduce the proper steps to leverage cost reduction through efficiency improvements. The following major barriers must be recognised and addressed to solve this dilemma: Lack of proper metrics: Energy efficiency has traditionally not been […]

The top six places to look for energy losses in buildings

  A typical thermal imager’s scan of a building can show energy saving opportunities of up to 15% with varying degrees of repair investments required. Unlike regular digital cameras, thermal imagers create pictures by detecting infrared energy or heat. The thermal imager then assigns colours based on the temperature differences it detects. With a small […]

Farewell to the incandescent lamp

  This article discusses the place of the incandescent lamp in the lighting industry over the years and explains in some detail three alternatives to this technology offered by the lighting industry. A lot has been written about the invention of the incandescent lamp. The first attempts at creating light using incandescent technology were made […]

The challenges of dimming LED loads with magnetic transformers

  The technical difficulties with dimming low-voltage LED lamps on magnetic transformers and some design tips to improve the situation and avoid problems. Anyone who has used LED loads with low-voltage magnetic or electronic transformers in dimming applications has likely experienced confusion, frustration or disappointment. Some blame the dimmer as the cause of the problem, […]