Using High Resolution Oscillography to Improve the Performance of Controlled Switching of Transformers

Energisation of power transformers at a random point-on-wave can result in inrush currents that far exceed the full-load rating of the transformer resulting in power quality issues and stress on equipment. Controlled switching, in which the breaker is closed at a point-on-wave chosen to minimise the inrush current, greatly reduces the inrush current and its negative effects.

This presentation will describe the design and commissioning of a controlled switching scheme using high resolution oscillography. This technology has been used to optimally energise and de-energise a high voltage power transformer.

Speakers

Brett Hampson (Senior Application Engineer), Schweitzer Engineering Laboratories (SEL) Asia Pacific

Brett has worked for more than 35 years in the electrical industry. He obtained his degree in Electrical and Electronic Engineering from the University of Auckland in 1997. Prior to this Brett worked as an Electrician in petrochemical, steel production and telecommunications fields. After graduation, Brett moved into a consulting role and has provided power systems services in the USA, UK, Australia and New Zealand.

Brett began working for SEL in 2000 for the Engineering Services division in the USA. A year or so later he accepted an application engineering role specialising in power system protection systems. He continues to provide training and technical support for power systems utilities and projects across the Asia-Pacific region.