Ventilation circuits applied to cylindrical rotor synchronous machines

  The main ventilation arrangements for cylindrical rotors in synchronous machines to dissipate heat from the stator and rotor windings. Cylindrical rotor synchronous machines are characterised by their rugged pole design. The poles are built flush with the rotor surface and their windings lie in slots in the rotor periphery, and are also called non-salient […]

Some interesting features of a modern power station – Part 2

  From the ICMEESA archive A closer look at South Africa’s most modern power plant, Arnot, focusing on its coal and ash handling plant; boilers; water plant; generators and control and monitoring, among others. Part 1 of this article discussed Arnot power station’s coal and ash handling plant; its boilers; circulation system; superheaters and reheaters […]

Preventing “accidents” in construction

  The recent Tongaat Mall collapse led to a media frenzy, only to fizzle out over time. The Department of Labour is investigating the “accident” and the question now is, “what will the findings be?” Fatalities, injuries, disease, and inadequate health and safety (H&S) measures, including non-compliance, will continue to occur until the South African […]

The causes and effects of inter-system ground noise

  Non-isolated computer equipment connections such as RS-232, parallel and USB can cause inter-system ground noise which AC power protection equipment cannot correct. The uninterruptible power supply (UPS) system is essential to any business computer system but it cannot protect the computer completely from all power related problems. Energy management company Schneider Electric has identified […]

Not-so-smart metering: an end-user’s point of view

  Smart metering, we have been told, allows the utility to read the meter remotely and the end-user to monitor and control energy consumption. The reality, however, is somewhat less appealing. Never having had such a facility available before makes one fairly ignorant of what can be expected and, as is usual in these cases, […]

Public lighting: Smarter lighting or no lighting at all?

  This article includes a review of major Belgian and international studies on street and highway lighting and its effects on road safety and energy conservation. In terms of street lighting, it is possible to maintain service and safety levels for users while saving energy. New terms are defined, such as “service level”, which measures […]