Voltage and var support in electric power systems

  The present environment for the operation of electric power systems (EPS) is complicated by environmental, economic as well as societal constraints. As a result EPS operate often close to their limits while trying to minimise costs and keep the quality of supply according to standards. The picture is complicated further by new types of […]

Oil analysis in wind turbine gearboxes

  South Africa’s Integrated Resource Plan (IRP), under the leadership of the Department of Energy (DoE), envisages renewable energy contributing 42% or 17,8 GW of the country’s new generation capacity by 2030. One of the ways the DoE plans to achieve this is with 8,4 GW of wind generated power. The DoE’s Renewable Energy Independent […]

Pumped storage scheme’s HV yard successfully energised

  Eskom successfully energised the high voltage (HV) yard and three power lines at the Ingula pumped storage scheme in June 2014. The project is currently under construction near Ladysmith on the border of KwaZulu-Natal and the Free State. The Ingula pumped-storage scheme, located within the Little Drakensberg mountain range, 23 km north-east of Van Reenen’s, […]

Emerging geospatial tools for the electrical grid

  Since the genesis of widespread electricity distribution in the 1880s, there has always been a need for geospatial information to help manage the grid. The electrical system is inherently spatial in nature, rooted in the geography of the service territory. This is true whether the territory is an entire country served by a national […]

Toward universal energy access: Designing a new household electrification strategy for SA

  Over the past two decades, South Africa has achieved a significant level of electrification: 76% of all households now have access to largely grid-connected power, up from 34% in 1994. Despite successes, the country’s Department of Energy (DoE) and its delivery partners face several barriers to electrifying the remaining backlog of 3,4-million households. In […]

Replacing a HV mining substation with a modular design

  Mining sites are often located in some of the most inhospitable and logistically challenging areas of the world. Mining operators are increasingly turning to the modular “e-house” design for their electrical systems to overcome these challenges. TGood Electric successfully applied the concept to a 110 kV high voltage mining substation in central Asia. Located […]

Grounding methods in mission critical facilities

  Many factors must be considered when designing the electrical system for critical facilities, such as winders on mines, not the least of which is the type of grounding system to be used. Proper grounding reduces overvoltages, improves uptime, and isolates faults. Grounded systems offer many benefits over ungrounded systems [1, 2, 3]. When properly […]

Quantifying the benefit of network visibility on overhead MV lines

  This paper uses the simplified network reliability framework developed by Eskom to examine the high-level economic benefits of network visibility options. The relative economic benefit of different network visibility options and the order of their deployment is analysed. Eskom supplies over 4,7-million customers on more than 8000 MV feeders (i.e. 6 – 33 kV) […]

Implementation of phasor measurement technology at Eskom

  The modern era of power delivery is faced with many challenges due to decreased reserves, increased use of renewable generation, flexible alternating current transmission system (FACTS) devices, and changes in customer/load behaviour. In order to manage the risks introduced by these challenges, it is important to have near real time visibility of the health […]

Standby or auxiliary power generation set sizing

  With the decreasing reliability of the grid power, standby generators have become a common feature in consumer networks.  In some cases of high reliability requirements, fixed on-site generators are used as the primary power source. In other cases, where power outage during a performance or event is unacceptable, the standby plant is used as […]