New approach in thermal monitoring of large power transformers applied on a 350 MVA odaf-cooled unit

• Autorzy: Cardillo E. , Feser K.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, 15-17 September, Wrocław 2004
• Języki publikacji: PL

Abstrakty

EN

Large power transformers belong to the most valuable and important assets in electrical power systems. The ageing of the used oil/paper-insulation primarily depends on the hot-spot temperature of the solid insulation system. Hence it is the dominant factor limiting the lifetime of the transformer. Therefore in 1996 a prototype of a stand alone thermal monitoring system was developed and installed on a 350 MVA transformer to observe the hot-spot temperature. The experiences of successfully operation during the last years encouraged us to update the system to the newest stage. The paper describes the state-of-the-art of the thermal transformer monitoring system based on new field bus technology. The advantages of a networked system and the usage of a centrally managed data base shared between multiple monitoring systems are exposed. The intention to implement new features exceeding the conventional monitoring system philosophy is discussed on an intelligent multifunction criteria Fuzzy algorithm for the control of fans of the heat exchanger units. It permits a more cost-effective long-time transformer operation management.

Słowa kluczowe

EN

power transformer; thermal monitoring; hot-spot temperature; paper/oil-insulation ageing; overload capability; fzzy controlled fan operation; field bus technology

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 77--81
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Cardillo E.

• Institute of Power Transmission and High Voltage Technology, University of Stuttgart

autor

Feser K.

• Institute of Power Transmission and High Voltage Technology, University of Stuttgart

Bibliografia

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• [2] IEC Loading guide for oil immersed transformers, IEC Standard 60354, Sep. 1991.
• [3] OSZTERMAYER J., CARDILLO E., MARKALOUS S., LENZ M., HOEK S., WIMMER R., FESER K., Asset Management Based on Improved Online Monitoring Systems Applied to a 110/380 kV Substation, IEEE Power Tech, Bologna, Italy, 2003.
• [4] RADAKOVIC Z., KALIC D., Results of a novel algorithm for the calculation of the characteristic temperatures in power oil transformers, Electrical Engineering, Vol. 80, No. 3, pp. 205-214, Jun 1997.
• [5] PIERCE L.W., An investigation of the thermal performance of an oil filled transformer winding, IEEE Transaction on Power Delivery, Vol. 7, No. 3, pp. 1347-1358, July 1992.
• [6] AUBIN J., LANGHAME Y., Effect of oil viscosity on transformer loading capability at low ambient temperatures, IEEE Transaction on Power Delivery, Vol. 7, No. 2, pp. 516-524, April 1992.
• [7] IEEE Std, C57.91 — 1995, IEEE Guide for loading Mineral Oil-Immersed Transformers, (1996).
• [8] SCHAEFER M., FESER K., Thermal Monitoring of Large Power Transformers, IEEE Power Tech, Budapest, Hungary, 1999.
• [9] TENBOHLEN, SCHAEFER M., Beurteilung der Über-lastbarkeit S. von Transformatoren mit online Monitoring-systemen, MICAFIL Symposium, 29/30.09.1999, Stuttgart, Germany
• [10] LEIBFRIED T., KNORR W., KOSMATA A., VIERECK K. and DOHNAL D., SUNDEMANN U., On-line Monitoring of Power Transformers — Trends, New Developments and First Experiences, CIGRE SC12, 1998.
• [11] TENBOHLEN S., UHDE D., POITTEVIN J., BORSI H., WERLE P., MATTHES H., SUNDERMANN U., Enhanced Diagnosis of Power Transformers using On-and Off-line Methods: Results, Examples and Future Trends, CIGRE SC12, 2000.
• [12] LEEMANS, P. RANDOUX M., EVEN A., DHUYVETTER G., DEKINDEREN E., Control, Diagnostic And Monitoring of Power Transformers, CIGRE SC12, 1998.