Judd, M.D. and Yang, L. and Bennoch, C.J. and Hunter, Ian, B.B. (2004) UHF diagnostic monitoring techniques for power transformers. In: EPRI Substation Equipment Diagnostics Conference XII, 2004-02-15 - 2004-02-18, New Orleans.
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This paper initially gives an introduction to ultra-high frequency (UHF) partial discharge monitoring techniques and their application to gas insulated substations. Recent advances in the technique, covering its application to power transformers, are then discussed and illustrated by means of four site trials. Mounting and installation of the UHF sensors is described and measurements of electrical discharges inside transformers are presented in a range of formats, demonstrating the potential of the UHF method. A procedure for locating sources of electrical discharge is described and demonstrated by means of a practical example where a source of sparking on a tap changer lead was located to within 15 cm. Progress with the development of a prototype on-line monitoring and diagnostic system is reviewed and possible approaches to its utilization are discussed. New concepts for enhancing the capabilities of the UHF technique are presented, including the possibility of monitoring the internal mechanical integrity of plant. The research presented provides sufficient evidence to justify the installation of robust UHF sensors on transformer tanks to facilitate their monitoring if and when required during the service lifetime.
|Item type:||Conference or Workshop Item (Paper)|
|Keywords:||uhf diagnostic monitoring, techniques, power transformers, Electrical engineering. Electronics Nuclear engineering|
|Subjects:||Technology > Electrical engineering. Electronics Nuclear engineering|
|Department:||Faculty of Engineering > Electronic and Electrical Engineering|
|Depositing user:||Pure Administrator|
|Date Deposited:||27 Apr 2012 14:01|
|Last modified:||24 Jul 2015 11:21|
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