Fast response GTO assisted novel tap changer

Hao Jiang, Roger Shuttleworth, Bashar A.T. Al Zahawi, Xiaolin Tian, Andrew Power

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


A new type of GTO thyristor assisted tap changer is outlined which addresses the problems of traditional schemes. The scheme minimizes conduction losses in the solid state devices and also permits a fast response speed through the adoption of fast actuator driven vacuum switches. This paper describes a prototype tap changer for a low voltage 300 kVA transformer using the new method of tap changing. The prototype operates at current levels similar to those at which a full scale tap changer would work. Test results are presented.

Original languageBritish English
Pages (from-to)111-115
Number of pages5
JournalIEEE Transactions on Power Delivery
Issue number1
StatePublished - Jan 2001


  • Tap changer
  • Vacuum switches


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