Water blocking in MV XLPE cables

  The penetration of water or the presence of moisture in XLPE cables is one of the most serious problems associated with the lifespan of cables under the influence of high electrical stresses. XLPE insulated cables which are designed to operate at 600 to 1000 V require insulation thicknesses well above those required purely for […]

Tapping untapped renewable energy

  In water distribution networks in South Africa, water is often fed under gravity from a higher reservoir to another reservoir at a lower level. This provides an opportunity to generate renewable energy by passing the flow through a turbine. The high pressure head at the receiving reservoir is then dissipated through the control valves […]

Power cable systems: The ideal underground power solution

  As South Africa develops, more and more electric power is needed to electrify domestic homes as well as to meet the ever-increasing demand for more power by the mining, industrial and commercial sectors in existing and newly developed areas around the country’s cities. This demand requires not just more power stations, but also more […]

Technologies for clean coal-power generation

  Coal is going to be an important component of power generation for many years to come. Increasing environmental requirements state that pollution associated with the burning of coal for power generation must be reduced if not eliminated altogether. Technologies for the removal of the harmful by-products associated with the burning of coal have been […]

Twenty-first century distribution transformers

  William Stanley, working for Westinghouse is credited for building the first refined and commercially used transformer. In 1886 he used his transformers in the electrification of Great Barrington, Massachusetts, USA. This was the first ever implementation of an AC power distribution system using step up and step down transformers. Today, more than 120 years […]

Case study: Fire in an underground 33 kV XLPE cable splice

  An underground mine was evacuated after a fault occurred involving the three-phase and ground on the 33 kV overhead line on the mine surface. While the initial fault cleared quickly, it appears to have led to a so-called “cross country fault” in the 33 kV reticulation system. Over the next six minutes a failure […]

Integrating a wind farm into a transmission or distribution system

  South Africa’s Renewable Energy Independent Power Producer programme (REIPPP) has produced keen interest by Independent Power Producers in wind energy facilities (WEFs) [1]. Integrating a WEF into a transmission or distribution network not only requires good engineering practices but also conformance to the NERSA grid connection code. This paper considers some of the requirements […]

Flexible gas engine concepts support renewable energy in power systems

  As the amount of variable renewable generation increases, in order for production to meet demand, sufficient balancing capability is needed. This requires greater flexibility in the power system, and generation technology based on internal combustion gas engines is one of the evident alternatives. Modern gas engine power plants with multi-engine concepts have numerous combinations […]