A problem with modern drives using high speed switching devices is the presence of common mode voltages (CMVs) in the variable frequency drive (VFD) feed. Doing away with the isolation transformer reduces the size, weight and cost of the VFD. While the electronics involved are more complex and therefore more costly, the overall benefits outweigh […]
Protection of synchronous generators involves the consideration of faults and harmful abnormal operating conditions, more so than the protection of other power system elements. The range of abnormal conditions and faults that can occur is extensive, and many could result in serious damage to the alternator and associated plant. In a properly protected generator, automatic […]
Health and cost savings considerations are driving an increasing move towards electric battery-driven vehicles and machinery in underground and opencast mining operations. Battery powered mining vehicles were introduced in the 1980s, but it is only in recent years that large-scale adoption of the technology is being considered. A recent news report states that the market […]
The units, which are supplied on several trailers, are available from a number of suppliers. Units are transported to site and the trailers coupled together on site to provide a fully functional and complete power station within the space of a few months from signing of contract. Installation on site is claimed to be as […]
The insulating properties of power cables deteriorate with time and, at some stage of life, the cable will be unable to meet performance requirements, and suffer repeated failures. End of life (EOL) will vary with the cable type, the installation and conditions under which the cable is operated, and will vary from installation to installation. […]
Substations and distribution boards in both the utility and industry sector are under increasing pressure to reduce space usage and cost, while maintaining safety and integrity. Switchgear is the main space occupant, and efforts at space reduction are focused on reducing both the volume and footprint occupied. Solid insulation switchgear offers reduced space and […]
The world’s first Generation 3+ nuclear power plant was recently taken into service in the Novovoronezh power station, some 500 km south of Moscow. This nuclear power plant (NPP) features some advanced features relating to safety, efficiency and cost reduction. Generation 3+ reactors are a development of the well-established Generation 3 reactor series. The […]
Storage is becoming one of the most important components of power generation, transmission and distribution, and consumption management. Efficient and cost effective storage is the next hurdle that needs to be overcome in the move to a higher penetration of renewable energy in the grid. EE Publishers will be hosting a dedicated conference and […]
Although Eskom has kept the promise of no more rolling black-outs, we are still experiencing random isolated area failures due to failures of the distribution network. The focus on managing electricity during rolling blackouts has diverted attention away from the problems with distribution, and now that there is plenty of power available, the problem […]
A recent tweet that drew attention to the fact that the problem of recycling old solar panels had been solved led me to delve into the subject of recycling renewable energy bits and pieces when they reach end of life. The process is well established and there is no real problem as to how to […]
