Posts tagged as electricity

Safety and portability in circuit breaker testing

  A high voltage circuit breaker is the most important component of a HV substation as it has the crucial task of removing the fault, no matter what the fault current is. Even a nominal current could be difficult to open as 2000 A on a 380 kV line would equate to approximately 500 MW […]

Creating a storage enabled smart grid

  With the rise of coupled solar and storage systems, there are challenges which must be addressed, notably claims of grid instability resulting from solar generation. A careful examination of the current situation from different perspectives, and proposition of viable solutions is necessary. There are two main challenges today in the solar photovoltaic (PV) market: […]

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 […]

First generating unit at Medupi goes live

  President Jacob Zuma opened Unit 6 of the Medupi Power Station recently. Unit 6 was first synchronised to the national grid on 2 March this year and has been producing electricity to the national grid intermittently whilst undergoing regular optimisation tests. Eskom’s acting chief executive, Brian Molefe, says the commercial operation of Unit 6 […]

A new Africa energy world: a more positive power utilities outlook

Africa faces a huge electricity demand challenge. Existing infrastructure is insufficient to meet current requirements, let alone the growth of the coming decades. Installed power capacity is expected to rise from 2012’s 90 GW to 380 GW in 2040 in sub-Saharan Africa. Nonetheless millions of Africans remain without access to electricity. Fortunately, difficulties such as […]