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Why test

Why test. REASON 1. 40% PROBLEMS IN TRANSFORMERS OLTC. REASON 2. HQ study showed 12% require maintenance before manufacturer’s suggested period. Presentation on OLTC diagnostics, Laurent Allard, ABB Secheron, Euro TechCon Chester UK 2010. REASON 3.

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Why test

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  1. Why test

  2. REASON 1 • 40% PROBLEMS IN TRANSFORMERS OLTC

  3. REASON 2 • HQ study showed 12% require maintenance before manufacturer’s suggested period. • Presentation on OLTC diagnostics, Laurent Allard, ABB Secheron, Euro TechCon Chester UK 2010

  4. REASON 3 • About one in 20 OLTC failures lead to transformer main tank failure • [western electricity coordinating council] • WECC Substation WG meeting minutes, Vancouver Washington, May 2006

  5. REASON 4 • About 33% of OLTC failures are caused by incorrect maintenance and bad reassembly. • P.Kang, D. Birthwistle, et al. "Non invasive on line condition monitoring of OLTC", IEEE proceedings January 2000, Generation, transmission and distribution, Volume 3, pp.2223-2228

  6. History of DRM • First proposal 1994 • First results published 1999-2000 Our experience (10 years) • Hall probes and scope • Modern electronic instruments + lap-top Today • Working group formed in Dublin 2010

  7. Working Group – Madrid 2011

  8. Workshop – field testing

  9. WG meeting Stockholm 2012

  10. ESBI Ireland Liandon The Netherlands ARCE Spain Gas Natural Spain EAC Cyprus Terna Italy ELIA Belgium MHY Pro Power Malaysia Elektroprenos Bosnia EDF France Siemens Germany ONE Nordic Sweden DV Power Sweden MR - Reinhousen Doble PowerTest UK Omicron Austria Seitz Instruments Switzerland PG&E USA ABB Stevo Electric Megger WG Participants

  11. Technology • In 1999 old technology with scope • In 2004 computer recording • RS232 communication • In 2009 high speed recording • USB communication • In 2011 demagnetization • In 2012 three phase recording

  12. Hall effect probe and scope

  13. Old instrument

  14. New instrument

  15. References • DYNAMIC RESISTANCE MEASUREMENTS IN LOAD TAP CHANGER - Luis Miguel Perea. Angel Ramos Gómez Unión Fenosa Distribución, Spain, José Luis Lozano Gómez  Norcontrol Soluziona, Spain • A DIAGNOSTIC TO DETERMINE THE CONDITION OF THE CONTACTS OF LOAD TAP CHANGERS IN A POWER TRANSFORMER H.F.A. Verhaart and Andre E. Lux, KEMA T &D Consulting, 2004 at Doble conf. • Advanced on-site diagnosis of transformer on-load tap changer, Jur J. Erbrink1, Edward Gulski1, Paul P. Seitz2, Rory Leich3; 1Delft University of Technology, The Netherlands; 2Seitz Instruments AG, Switzerland; 3Nuon Tecno, The Netherlands, IEEE INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATION 8 - 11 June 2008 Vancouver, BC, Canada • EXPERIMENTAL MODEL FOR DIAGNOSING ON-LOAD TAP CHANGER CONTACT AGING WITH DYNAMIC RESISTANCE MEASUREMENTS, Jur J. Erbrink2, Edward Gulski1, Johan Smit1, Rory Leich3; 1Delft University of Technology, The Netherlands; 2Seitz Instruments AG, Switzerland; 3Liandon, The Netherlands, Cired 2009 paper 0134 • On Load Tap Changer Dynamic Resistance Measurement, By Raka Levi, Alex Cincar, Keith Bensley, published in Australia at TechCon 2010 • Experience on Dynamic Contact Resistance Test on Eroded and Worn-Out Tap-Changer Contacts, R. Samsudin, Yogendra, TNB Research Sdn Bhd; A.Berhanuddin, Y.Zaidey, Tenaga Nasional Berhad; M.Haneef, MHY Pro-Power Services Sdn Bhd - published 2010 in Malaysia • Interpretation of Dynamic Resistance Results of On-Load Tap Changers; J.J. Erbrink1, E. Gulski1, J.J. Smit1, R. Leich2, P.P. Seitz3 and B. Quak3 1 Delft University of Technology, Delft, the Netherlands 2 Liandon, Alkmaar, the Netherlands 3 Seitz Instruments AG, Niederrohrdorf, Switzerland  published Japan 2010 • Reproducibility of Dynamic Resistance Measurement Results of On-Load Tap Changers – Effect of Test Parameters; J.J. Erbrink1*, E. Gulski1, J.J. Smit1, R. Leich2, P.P. Seitz3 and B. Quak3 1 Delft University of Technology, Delft, the Netherlands 2 Liandon, Alkmaar, the Netherlands 3 Seitz Instruments AG, Niederrohrdorf, Switzerland - Japan 2010 • Condition Assessment of OLTC using static and dynamic resistance tests; Brendan Diggin, ESBI, presented at the AMforum FORUM Dublin 2010 • Doctoral thesis:  OLTC Diagnosis on High Voltage Power Transformers using Dynamic Resistance Measurements, Jur Erbrink, Technische Universiteit Delft, 28. March 2011

  16. The end http://amforum.org/site/drm.htm

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