UHF diagnostic monitoring techniques for power transformers

M.D. Judd, L. Yang, C.J. Bennoch, Ian, B.B. Hunter

Research output: Contribution to conferencePaper

Abstract

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.

Conference

ConferenceEPRI Substation Equipment Diagnostics Conference XII
CountryUnited States
CityNew Orleans
Period15/02/0418/02/04

Fingerprint

Power transformers
Monitoring
Partial discharges
Sensors
Mountings
Electric sparks
Lead
Gases

Keywords

  • uhf diagnostic monitoring
  • techniques
  • power transformers

Cite this

Judd, M. D., Yang, L., Bennoch, C. J., & Hunter, I. B. B. (2004). UHF diagnostic monitoring techniques for power transformers. Paper presented at EPRI Substation Equipment Diagnostics Conference XII, New Orleans, United States.
Judd, M.D. ; Yang, L. ; Bennoch, C.J. ; Hunter, Ian, B.B. / UHF diagnostic monitoring techniques for power transformers. Paper presented at EPRI Substation Equipment Diagnostics Conference XII, New Orleans, United States.18 p.
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Judd, MD, Yang, L, Bennoch, CJ & Hunter, IBB 2004, 'UHF diagnostic monitoring techniques for power transformers' Paper presented at EPRI Substation Equipment Diagnostics Conference XII, New Orleans, United States, 15/02/04 - 18/02/04, .

UHF diagnostic monitoring techniques for power transformers. / Judd, M.D.; Yang, L.; Bennoch, C.J.; Hunter, Ian, B.B.

2004. Paper presented at EPRI Substation Equipment Diagnostics Conference XII, New Orleans, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - UHF diagnostic monitoring techniques for power transformers

AU - Judd, M.D.

AU - Yang, L.

AU - Bennoch, C.J.

AU - Hunter, Ian, B.B.

PY - 2004/2

Y1 - 2004/2

N2 - 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.

AB - 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.

KW - uhf diagnostic monitoring

KW - techniques

KW - power transformers

M3 - Paper

ER -

Judd MD, Yang L, Bennoch CJ, Hunter IBB. UHF diagnostic monitoring techniques for power transformers. 2004. Paper presented at EPRI Substation Equipment Diagnostics Conference XII, New Orleans, United States.