Renewable energy capacity in Sub-Saharan Africa is projected to nearly double by 2027, with the addition of over 40 GW from alternative power sources. More than 60% of this growth will be derived from South Africa, largely due to its Renewable Independent Power Producer Programme (REIPPP).
However, as the world's attention increasingly focuses on optimizing energy consumption and minimizing CO₂ emissions, the sustainability of the components used in renewable energy projects becomes paramount.
Electricity generation technologies
Electricity generation technologies, including renewables, emit greenhouse gases during their lifecycle
Dr Andrew Dickson, Engineering Executive at CBI-electric: low voltage, emphasises that despite their eco-friendly nature, all electricity generation technologies, including renewables, emit greenhouse gases during their lifecycle.
“The carbon footprint of renewable energy can range from 11 to 740 grams of CO₂ equivalent per kWh. Therefore, to achieve true sustainability, it is imperative to adopt advanced, greener technologies wherever possible.”
Essential for safeguarding electrical installations
Dickson continues by saying, “Something as innocuous as a circuit breaker should be factored in when determining the carbon footprint an installation creates. While these are essential for safeguarding electrical installations, they still consume electrical energy during normal operation and though they are passive devices, they are contributing to CO₂ emissions."
"Furthermore, this passive energy consumption ultimately translates into monetary costs. Given the growing demand for low-voltage circuit breakers as renewable energy projects expand across South Africa and the continent, it's essential to reduce these emissions and financial costs while also gaining maximum efficiency from the renewable system.”
Refocus on Hy-Mag circuit breakers
To this end, Dr. Dickson recommends a refocus on Hydraulic-Magnetic (Hy-Mag) circuit breakers over thermal-magnetic counterparts in renewable energy projects.
“Hy-Mag circuit breakers utilise magnetic flux to switch, relying on the relationship between current flow and coil turns to create the necessary tripping force. In contrast, thermal-magnetic breakers require the heating of a bimetal strip mechanism, which, by its nature, consumes more electrical energy. This fundamental technology difference results in lower lifetime energy consumption during standard operation of Hy-Mag breakers, reducing total energy losses and carbon emissions.”
Thermal-magnetic breakers' performance
Dickson points out that thermal-magnetic breakers' skit is temperature-dependent, which can be problematic
He also points out that thermal-magnetic breakers' performance is temperature-dependent, which can be problematic in regions with extreme temperature variations, such as South Africa's Northern Cape, which is home to numerous solar power plants.
“Hy-Mag breakers, on the other hand, maintain consistent protection regardless of temperature changes, making them more suitable for environments with substantial temperature fluctuations.”
Long-term success of renewable energy installations
“Furthermore, Hy-Mag breakers' optimal performance within a temperature range of −40°C to +85°C minimises nuisance tripping and ensures a more stable solution,” he adds. “This not only enhances operational reliability but also extends the lifespan of the breakers, leading to more dependable performance over time.”
“By adopting greener, more energy-efficient solutions, the industry can reduce carbon emissions, improve energy efficiency, and ensure the long-term success of renewable energy installations. As Sub-Saharan Africa and the world at large transition toward a more sustainable energy landscape, these innovations are pivotal in driving positive change,” concludes Dr Dickson.
