Most common wastes in an electro-mechanical system

  According to the US Department of Energy estimates, motors account for 70% of all electricity used by industry. They are prime targets for finding and reducing energy waste because they use so much energy. Electro-mechanical equipment wastes energy in two primary ways: When it is operated more often than necessary. Either by schedule (equipment […]

Switchgear for power factor correction systems

  The importance of differentiating between various circuit types or capacitor assignments to inductive loads when implementing power factor correction (PFC). A differentiation is made between individual PFC and group PFC. With individual PFC, the capacitor is assigned individually or switched to a load. With group PFC, the power factor of a load group is […]

Ilanga II: Under the hood of a sun chaser

  The engineering challenge of designing and building a solar-powered racing car for a strenuous eight-day international endurance race brings together research, theory and development while promoting alternative energy and technological innovation. The Ilanga II is a prototype solar racing car developed by the University of Johannesburg (UJ) Solar Team to compete in this year’s […]

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 […]