Protecting smart power grids and data networks

  In future, structures for power generation, transmission and distribution in the high, medium and low-voltage ranges will be more complex and flexible than they are today. New topics such as smart grid, smart metering or smart home require innovative solutions. But also the rapid rise of distributed, renewable energy sources, in combination with centralised […]

Causes and control of electrical machine vibration

  This article examines the causes of electrical machine vibration, the effects of vibration, and means taken to mitigate vibration. All rotating machines, no matter how well designed and manufactured, exhibit vibration of some form when operating. Excessive vibration can cause damage to the machine or reduce its lifetime, as well as damage to other […]

The “how to” of surge protection for dairy farming

  Lightning protection systems are recommended for all farm buildings to reduce the risk of damage sustained from a lightning strike. This is of particular concern across the African continent, given the high incidence of thunderstorms involving lightning that occur across this region. Lightning is a stream of pure energy that is looking for the […]

Positive demand side management: balancing renewable energy sources

  Demand side management (DSM) is normally associated with encouraging or forcing a reduction in maximum demand to enable a constrained generation capacity to match demand. However, the introduction of variable renewable energy sources into many grids has resulted in times where generation capacity far exceeds demand for short periods, stressing the generation fleet as […]

Extending the life of gas engines for power generation

  The development of regional gas-fields will lead to natural gas becoming a more significant fuel source in South Africa. Natural gas, while not renewable, is an abundant, clean low-carbon fossil fuel that is projected to become a significant fossil energy medium in the next 50 years. Electricity-generating gas engines will become increasingly important as […]

Solar solutions for low cost housing

  South Africa faces an immense challenge to address the backlog in the construction and delivery of quality, low cost housing. While there are a number of initiatives underway, there is said to be a backlog of about 2,3-million houses. Integral to the construction of these houses is the provision of energy for basic needs. […]

Energy efficiency in HVAC industrial applications

  Several industrial HVAC requirements differ from commercial building requirements and are not often considered in terms of energy efficiency. Heating, ventilation, and air conditioning (HVAC) is a major energy consumer  in commercial buildings and energy efficiency measures have been developed in this field. Industrial premises have special requirements which are more complex than commercial […]