Determining water in transformer paper insulation: Effect of measuring oil water activity at two different locations

IEEE Electrical Insulation Magazine

Volumn 31, Issue 3, 2015, Pages 18-25

  Martin, Daniel ^a   Saha, Tapan ^a   Gray, Tony ^b   Wyper, Ken ^b  

^a UNIVERSITY OF QUEENSLAND   (Australia)

^b Asset Performance Substation Systems TransGrid   (Australia)

Author keywords

condition monitoring; insulation; paper insulation; transformer

Indexed keywords

CONDITION MONITORING; INSULATION; POWER TRANSFORMERS;

LABORATORY MEASUREMENTS; OIL WATER; PAPER INSULATION; TRANSFORMER; TRANSFORMER PAPER INSULATION;

OIL FILLED TRANSFORMERS;

EID: 84928732825     PISSN: 08837554     EISSN: None     Source Type: Journal    
DOI: 10.1109/MEI.2015.7089118     Document Type: Article

References (22)

1. T. V. Oommen and T. A. Prevost, "Cellulose insulation in oil-filled power transformers: Part II-Maintaining insulation integrity and life," IEEE Electr. Insul. Mag., vol. 22, pp. 5-14, Mar./Apr. 2006.
2. W. A. Fessler, O. Rouse, W. J. McNutt, and O. R. Compton, "A refined mathematical model for prediction of bubble evolution in transformers," IEEE Trans. Power Del., vol. 4, no. 1, pp. 391-404, Jan. 1989.
3. Y. Du, Measurements and Modeling of Moisture in Transformer Insulation. Saarbrücken, Germany: VDM Verlag Dr. Müller, 2009.
4. Y. Du, A. V. Mamishev, B. C. Lesieutre, M. Zahn, and S. H. Kang, "Measurements of moisture solubility for differently conditioned transformer oils," IEEE Trans. Dielectr. Electr. Insul., vol. 8, no. 5, Oct. 2001.
5. T. K. Saha and P. Purkait, "Investigations of temperature effects on the dielectric response measurements of transformer oil-paper insulation system," IEEE Trans. Power Del., vol. 23, no. 1, pp. 252-260, Jan. 2008.
6. D. Martin, C. Perkasa, and N. Lelekakis, "Measuring paper water content of transformers: A new approach using cellulose isotherms in nonequilibrium conditions," IEEE Trans. Power Del., vol. 28, no. 3, pp. 1433-1439, 2013.
7. International Food Information Service, Dictionary of Food Science and Technology, 2nd ed. West Sussex, UK: Wiley-Blackwell, 2009.
8. D. Martin, N. Lelekakis, W. Guo, and Y. Odarenko, "Further studies of a vegetable-oil-filled power transformer," IEEE Electr. Insul. Mag., vol. 27, no. 5, pp. 6-13, 2011.
9. A. L. Buck, "New equations for computing vapor pressure and enhancement factor," J. Appl. Met., vol. 20, pp. 1527-1532, 1981.
10. M. Koch, S. Tenbohlen, and T. Stirl, "Diagnostic application of moisture equilibrium for power transformers," IEEE Trans. Power Del., vol. 25, no. 4, pp 2574-2581, Oct. 2010.
11. N. Lelekakis, J. Wijaya, D. Martin, T. Saha, D. Susa, and C. Krause, "Aging rate of grade 3 presspaper insulation used in power transformers," IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 5, pp. 2355-2362, 2014.
12. Pressboard and Presspaper for Electrical Purposes - Part 2: Methods of Tests, Ed. 2.0, IEC Standard 60641-2, Switzerland, 2004.
13. N. Lelekakis, J. Wijaya, D. Martin, and D. Susa, "The effect of acid accumulation in power-transformer oil on the aging rate of paper insulation," IEEE Electr. Insul. Mag., vol. 30, no. 2, Mar./Apr. 2014.
14. CIGRE Task Force D1.01.10, "Furanic Compounds for Diagnosis," CIGRE Brochure No. 494, 2012.
15. Fluids for Electrotechnical Applications - Unused Mineral Oils for Transformers and Switchgear, edition 4.0, IEC Standard 60296, Switzerland, 2012.
16. IEEE Guide for Loading Mineral-Oil-Immersed Transformers and Step Voltage Regulators, IEEE Std. C57.91-2011, IEEE Power and Energy Society, USA, 2012.
17. N. Lelekakis, D. Martin, and J. Wijaya, "Ageing rate of paper insulation used in power transformers Part 1: Oil/paper system with low oxygen concentration," IEEE Trans. Dielectr. Electr. Insul., vol 19, no. 6, pp. 1999-2008, 2012.
18. Omicron, "Dirana Dielectric Response Analyzer," product literature, No. L070, Austria, Apr. 2008.
19. Power Transformers - Part 7: Loading Guide for Oil-Immersed Power Transformers," IEC Standard 60076-7, Switzerland, 2005.
20. Standard Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration, ASTM D1533, ASTM International, USA, 2012.
21. Committee D27 on Electrical Insulating Liquids and Gases, "Inter-laboratory study to establish precision statements for ASTM D1533, Standard Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration,"ASTM International, USA, 1999.
22. CIGRE working group A2.30, "Moisture equilibrium and moisture migration with transformer insulation systems," CIGRE brochure 349, Paris, France, Jun. 2008.