Posts tagged as Installations Technical

Lightning and surge protection for rooftop PV systems

  Apart from damaging solar photovoltaic (PV) modules, inverters and monitoring elecronics, lightning strikes also lead to field-based and conducted electrical interference. According to the South African Photovoltaic Industry Association (SAPVIA), photovoltaic (PV) is the fastest growing power generation technology in the world. More than 35 GW of PV is installed and operating worldwide, producing […]

Modern power quality issues

  As we connect more electronic devices to our power systems, the quality of the power becomes more complex. Grounding affects voltage stability and, more importantly, is critical to personal safety. Numerous articles have been written on the subject of harmonics. However, these articles do not always address our basic problems in an understandable way: […]

Most common wastes in an electro-mechanical system

  According to the US Department of Energy estimates, motors account for 70% of all electricity used by industry. They are prime targets for finding and reducing energy waste because they use so much energy. Electro-mechanical equipment wastes energy in two primary ways: When it is operated more often than necessary. Either by schedule (equipment […]

Comparing harmonics mitigation techniques

  A comparison of harmonic mitigation techniques in a range of applications and settings, and theoretical and practical comparisons between active and passive series and shunt filters to reduce harmonic loading in a drive system. Harmonics in power systems are mostly caused by various semiconductor-based loads. Most common loads are drive systems (typically transistor-based variable […]

The top six places to look for energy losses in buildings

  A typical thermal imager’s scan of a building can show energy saving opportunities of up to 15% with varying degrees of repair investments required. Unlike regular digital cameras, thermal imagers create pictures by detecting infrared energy or heat. The thermal imager then assigns colours based on the temperature differences it detects. With a small […]