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The most expensive kWh is the one you don't have
by Mike Rycroft, Energize editor
 A phrase used at a recent workshop in support of energy savings was "The cheapest kWh is the one you don't use". With the warning of energy shortfalls, the appropriate slogan for 2011 may be "The most expensive kWh is the one you don't have"... ( more) |
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State of the electricity system
Information from Eskom
Eskom has outlined South Africa's power system status constraints over the next two to five years, the measures it is taking to ensure a secure electricity supply and the steps consumers should take to help contain demand over this difficult period... ( more) |
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SAIEE National Student Project Competition
by Mark Botha, EEpublishers
The 2010 SAIEE National Student Project Competition took place on 25 November at the University of Johannesburg. EE Publishers sponsored the prize money of R25 000... ( more) |
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REDs are dead, long live the MEDs
by Oom Kaspas
Participants have to acknowledge the destructive role that politics has played in the debate on REDs. A new culture has to be instilled in this industry whereby emphasis has to be placed on its public mandate; supply authorities are merely custodians of the power consumers' assets... ( more) |
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The Jacob Marley column: A taxing problem
Business, it seems, is more interested, like my old partner Scrooge, in turning a fast penny (as are politicians, I fear). So I will persist in rattling my chains and making your erudite readers think not about what might have been, but what can be... (more)
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Balancing coal mass flow to burners
by Leif Svov, M & W Asketeknik, for OEN Enterprises
The topic of balancing coal mass flow to burners in coal fired power plants has become the focus for power plant optimisation. A range of instruments is available to provide the best results in terms of flow balancing... ( more) |
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China and nuclear energy: Humility from hard experience
by Chris Meyer, technical journalist
If the projections of the World Nuclear Association materialise, China could have 160 GW of electricity generated by nuclear power by 2030. If all this were to be supplied by nuclear power plants of 1000 MWe, that would mean 160 such plants would need to be built... (more) |
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Breakthrough with CO2 reduction technology
Information from Siemens
Siemens Energy has successfully completed the first test phase with its CO2 capture process in a pilot facility at the Staudinger power plant operated by E.ON. The process sets new benchmarks in CO2 capture in fossil-fueled power plants... (more) |
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Cigré 2010 Paris: open session SCB2 overhead lines
by Rob Stephen, Eskom Distribution and member of Cigré B2
This is a summary of the discussion which took place during the 2010 open session of the Cigré Group B2, Overhead Lines. The session dealt with three specific preferential subjects. Twenty seven papers were published with almost 60 prepared discussions showing a high interest in the preferential subjects... (more)
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Standards for MV switchgear rated for arc flash protection
by Bryan Johnson, ABB
To achieve some degree of safety users and manufacturers have considered, measures ranging from PPE, specific operating procedures, through to remote control and arc detection systems...(more)
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Transmission lines upgraded without delivery disruption
by Mark Botha, features editor
"Barehand" and "hotstick" energised techniques, coupled with patented robotic arm technology, eliminate power supply interruptions during overhead transmission and distribution line maintenance works... (more) |
Global standards for arc rated personal protective equipment - Part 1
Information from JAS Consulting
As installed infrastructure is operated beyond its design life, maintenance budgets are downsized and the interval between outages is ever increasing, electrical failures are becoming more prevalent in the global context. Electrical failures most often result in an electrical arc flash phenomenon... ( more) |
Efficient energy begins and ends with one thing - a battery
Information from First National Battery
2008's load shedding crisis caused many South African consumers to rush out to purchase generators, and importers could not keep up with the demand. But did consumers consider the implications of their expensive generator investments?... ( more) |
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Motor repair solution for Sasol
Information from Marthinusen and Coutts
Intimate knowledge of induction motors and the application of technology places an expert repairer in the enviable position of being able to assess whether motors are beyond economical repair or not... (more)
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Maximum energy azimuth and tilt angles for PV installations in South Africa
by Tebogo Matshoge, University of Cape Town and Adoniya Ben Sebitosi, University of Stellenbosch
In this paper the optimum angles (azimuth and tilt) to maximise annual energy yield for fixed angle PV installations at all locations in South Africa have been tabulated... (more)
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Inverters for renewable energy systems
Information from MLT Drives
Inverters are an essential component of solar photovoltaic systems. Locally developed and manufactured products are available that cover the range from small systems of several kW to large installations in the MW range... (more)
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IGBTs for solar inverter applications
by Wibawa Chou, International Rectifier
For solar inverter applications, IGBTs offer benefits compared to other types of power devices, like high current carrying capability, gate control using voltage instead of current and the ability to match the co-pack diode with the IGBT... (more)
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