Search - Number 20 - DEVELOPMENT AND SCIENTIFIC GROUND OF TECHNICAL SUGGESTIONS ON INCREASE OF RELIABILITY, ENERGY EFFICIENCY AND EXTENSION OF RESOURCE OF TRANSFORMERS OF TNC-1250000/330 ON NPS UNITS OF UKRAINE

DEVELOPMENT AND SCIENTIFIC GROUND OF TECHNICAL SUGGESTIONS ON INCREASE OF RELIABILITY, ENERGY EFFICIENCY AND EXTENSION OF RESOURCE OF TRANSFORMERS OF TNC-1250000/330 ON NPS UNITS OF UKRAINE
Cover not present DEVELOPMENT AND SCIENTIFIC GROUND OF TECHNICAL SUGGESTIONS ON INCREASE  OF RELIABILITY, ENERGY EFFICIENCY AND EXTENSION OF RESOURCE OF TRANSFORMERS   OF TNC-1250000/330 ON NPS UNITS OF UKRAINE
Category: Number 20
Publication: 20
Summary

Statistics, design- and technological characteristics of main transformers of NPS units were compiled and ana-lyzed. In article the basic typical and probable scenarios of preemergency and emergency refusals of main transform-ers of NPS units TNTS-1250000/330 are investigated. . Reasons of unit transformer failures resulting in forced outage of the units were found. On the basis of the analysis of refusals methods of service of power transformers after them the normalized operation term are offered. Breakdown susceptibility researches have allowed to define the cores "risk zones" equipment, to reveal interpretations of various defects and to offer some kontrol-diagnostic management methods service life of the transformer equipment of blocks of the atomic power station of Ukraine

Keywords: unit transformers, bushings, shunt reactors, coupling autotransformers, breakdown and deteriora-tion of insulation, cooling system, reliability, safety.

REFERENCES
1. Life management techniques for power transformers // CIGRE Technical Brochure. – 2003. – № 227.
2. Zozulia D. V. Analysis of cervice experience of ORC-417000/750 main unit transformers of NPS units of Ukraine // Problemy bezpeky atomnyh electrostansiy i Chornobylya (Problemy of nuclear power plants and of Chorno-byl). – 2012. – Iss. 18. – P. 66 – 76. (Ukr)
3. Zozulia D.V., Fedorenko G. M. Analysis of current state of transformer equipment, its role and place in affording safety, increasing power and ecological effectiveness operation of units of nuclear power stations of Ukraine // Problemy bezpeky atomnyh electrostansiy i Chornobylya (Problemy of nuclear power plants and of Chornobyl). – 2011. – Iss. 17. – P. 59 – 67. (Ukr)
4. Mechanical condition assessment of transformer windings using frequency response analysis (FRA) // CIGRE Technical Brochure. – 2003. – № 342.
5. IEC 60599 – Mineral oil-impregnated equipment in service – interpretation of dissolved and free gases analysis. - 2007.
6. IEEE Standart. Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers C57. – 1991. – 104 р.
7. Moelmann A., Pahlavanpour B. New Guidelines for Interpretation of Dissolved Gas Analysis in Oil-Filled Trans-formers // Electra. – 1999. – № 186. – Р. 31 – 51.
8. Tsukioka H. et al. Behavior of gases generated from decomposition of insulating oils under effect of localized heating // Denki Gakkai Rombunsi. – 1978. – Vol. 98-A. – № 7. – Р. 381 – 388.
9. Okubo H. et al. Electrical Insulation Diagnostic Method and Maintenance Criteria for Oil-Immersed Power Trans-formers // Proceedings of the 13th International Conference on Diagnostic Liquids. Nara, Japan, July 20 - 25, 1999.
10. Current problems in insulating systems including assessment of aging and degradation // Join colloquium // Elec-tra. – 1990. – № 133.
11. Sokolov V. et al. Experience with Life Management of 750 kV GSU Transformers at 100 MW units of Zapo-rozhskaya Nuclear Power Plant // Proceedings of the Sixty-Fifth Annual International Conference of Doble Clients. – 1998. – Р. 8 - 11.
12. Sokolov V. Consideration on Power Transformer Condition- based Maintenance // EPRI Substation Equipment Diagnostic Conference VIII. – New Orleans, 2000, Feb. 20 - 23.

Full text