Posts tagged as Mike Rycroft

Causes and control of electrical machine vibration

  This article examines the causes of electrical machine vibration, the effects of vibration, and means taken to mitigate vibration. All rotating machines, no matter how well designed and manufactured, exhibit vibration of some form when operating. Excessive vibration can cause damage to the machine or reduce its lifetime, as well as damage to other […]

Man-made disasters and resilient home power systems

  Resilient power systems are usually taken to mean grid power systems that can survive natural disasters and provide power to critical sites under extreme conditions. This requirement emerged in the USA after Hurricane Katrina and is now being legislated into many states. In South Africa, we are not subject to such devastating natural disasters […]

Amorphous core material offers lower losses for distribution transformers

  Traditionally transformer cores have been constructed of grain orientated steel alloys, but a new material which has an amorphous structure is being used increasingly in distribution transformers. The material offers advantages over traditional materials and transformers using the core material are being used in a wide range of applications. Distribution transformers constitute the largest […]

Industrial power and energy savings initiatives in South Africa

The electricity crisis of 2008 sparked numerous initiatives by government, Eskom and industry associations to reduce power demand and energy use. This article provides a summary of some of these, their effectiveness and impact. The main purpose of these programmes was to reduce the demand on the grid and to free up generating capacity. Two […]

Rectifier transformers: Technology update

  Industry sectors such as the electrochemical and smelting rely on low voltage high current DC supplies for operation, which are supplied from sources known as rectifier transformers. This article is an overview of the technology available in this field. The transformer and rectifier are provided as a combined unit. The low voltage and very […]