The next big improvement in the world of transformer core production was the advent of step-lap construction, which eases the transfer of flux in the corners from one lamination to another, thereby reducing the core loss by up to 14%. The process also reduces the build time.

In the 1970s and 1980s, before privatisation of the electricity supply industry, the regional electricity companies placed a high value on loss, and so the drive was always towards more efficient transformers, which lead to more expensive materials with much reduced losses. However, this trend has reversed since privatisation as priorities have changed to cost saving.

Paul Dunford argues that the need to reduce emissions could give a boost to the transformer industry by encouraging research into new ways of building them, but he is concerned that despite industry talk, it is mostly just lip service. Transformers may have been around for 100 years but as far as reduction of emissions is concerned we are still tinkering around the edges of the problem instead of driving forward.

Further changes in transformer building are likely to be led by the increasing prevalence of alternative forms of power generation. Wind, solar, wave, tidal power and photvoltaics are all ripe for exploitation.

Established more than 100 years ago R. F. Winder Ltd, specialises in the manufacture of industrial electrical power equipment (e. g.

transformers and LV switchgear).

The company offers a comprehensive design and build service, which is backed up a full 24 hour emergency service, and an extensive loan range of equipment for most commercial and industrial power applications.

www.winder.co.uk