Applicability of the FRA method for characterization of insulation of power transformers

• Autorzy: Serdyuk Y. V. , Podoltsev A. D. , Gubański S. M.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, 15-17 September, Wrocław 2004
• Języki publikacji: EN

Abstrakty

EN

Frequency response analysis (FRA) is usually used for diagnostics of mechanical deformations and displacements of transformer windings caused by electromagnetic forces during short circuits. In general, a high frequency response of a transformer is affected by the properties of all transformer components, and, thus, the FRA carries information about the state of the whole transformer including its main electrical insulation. From this point of view, the FRA might be considered as an alternative to the existing methods for assessment of the insulation. In the present paper, the applicability of the FRA is analysed using a high frequency model of a transformer, which takes into account the complex structure of the oil-paper insulation and frequency dependencies of the dielectric permittivities of the insulation components as well as winding resistances. A sensitivity analysis of the computed frequency responses to the variations in geometrical structure and complex permittivities of the components is presented.

Słowa kluczowe

EN

transformer insulation; high-frequency response; complex permittivity; dielectric properties

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 82--85
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Serdyuk Y. V.

• Chalmers University of Technology, 41296 Gothenburg, Sweden

autor

Podoltsev A. D.

• Institute of Electrodynamics, Peremoga Ave., 56, 03680 Kiev, Ukraine

autor

Gubański S. M.

• Chalmers University of Technology, 41296 Gothenburg, Sweden

Bibliografia

• [1] FESER K., Monitoring und Diagnose von Transformatoren online oder offline?, MICAFIL Symposium, Werterhaltung von Transformatoren. 27/28.031996, Stuttgart, Germany
• [2] IEC Loading guide for oil immersed transformers, IEC Standard 60354, Sep. 1991.
• [3] OSZTERMAYER J., CARDILLO E., MARKALOUS S., LENZ M., S. HOEK, WIMMER R., K. FESER, 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 S., SCHAEFER M., Beurteilung der Über-lastbarkeit 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 SC 12. 2000.
• [12] LEEMANS P., RANDOUX M., EVEN A., DHUYVETTER G., DEKINDEREN E., Control, Diagnostic And Monitoring of Power Transformers, CIGRE SC 12, 1998.