Reliability and influences on dielectric diagnostic methods to evaluate the ageing state of oil-paper insulations

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

Abstrakty

EN

Dielectric measurements and diagnostic methods are established procedures to evaluate moisture as an ageing indicator in commonly used oil-paper insulations of power transformers. Both the measurements themselves as well as the analysis of collected data contain several uncertainties and sources of error. This investigation discusses the sources of error and gives a further insight to the influences of transformer insulation design (geometry), insulation temperature, moisture equilibrium in oil and paper and other aspects regarding practical measurements. The dominating impact on dielectric analysis is related to the insulation temperature rather than insulation geometry. Limits and influences on linear modelling of multilayer insulations by equivalent circuits are described too. The investigation includes all the common dielectric diagnostic methods for oil-paper insulations: Recovery Voltage Method (RVM), Polarisation and Depolarisation Currents (PDC) and Frequency Domain Spectroscopy (FDS).

Słowa kluczowe

EN

dielectric diagnostic; oil-paper insulation; polarisation; moisture equilibrium; RVM; PDC; FDS

• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 95-101
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Koch, M.

• University of Stuttgart

autor

Feser, K.

• University of Stuttgart

Bibliografia

• [1] DU, Y., M. ZAHN, B.C. LESIEUTRE, A.V. MAMISHEV, AND S.R. LINDGREN, A Review of Moisture Equilibrium in Transfonner Paper-Oil Systems IEEE Electrical Insulation Magazine, Vol. 15, No. 1, pp. 11-20, January-February 1999
• [2] KÜCHLER, A.; LEIBFRIED, T., Beruecksichtigung geometrischer and parasitaerer Einfluesse bei der Bestimmung des Wassergehalts in Oel-Papier Isolationen durch dielektrische Diagnose, ETG Fachtagung Diagnostik Cologne 2004
• [3] ZAENGL, W.S., Dielectric Spectroscopy in Time and Frequency Domain for HV Power Equipment, Part I: Theoretical Considerations, IEEE Electrical Insulation Magazine, Vol. 19, No. 5, 2003
• [4] Der Houhanessian, Vahe: Measurement and analysis of dielectric response in oil-paper insulation systems, dissertation ETH Zürich, 1998
• [5] NEMETH E., Measuring the voltage response, a diagnostic test method of insulation, presented at 7th ISH, Dresden, 1991
• [6] KACHLER A.J., BAEHR R., ZAENGL W.S., BREITENBAUCH B., SUNDERMANN U., Kritische Anmerkung zur Feuchtigkeitsbestimmung von Transformatoren mit der Recovery- Voltage- Methode, Elektriztaetswirtschaft, Jg. 95 (1996)
• [7] Diverse Publications see http://www.haefely.com/measuring_diagnostics/rvm.html
• [8] NEIMANIS, R., TAPAN K. Saha, ERIKSSON R., Determination of Moisture Content in Mass Impregnated Cable Insulation Using Low Frequency Dielectric Spectroscopy, IEEE Power Engineering Society Summer Meeting, Seattle, USA, July 16-20, 2000
• [9] CIGRÉ TASK FORCE 15.01.09: Dielectric Response Methods for Diagnostics of Power Transformers, published in ELECTRA No. 202 - June 2002
• [10] KLEBOTH-LUGOVA O. , BUERSCHAPER B., LEIBFRIED T., Feuchtebestimmung in Isoliermedien - ein Erfahrungsbericht ETG Fachtagung Diagnostik Cologne 2004
• [11] HAVRILIAK S., HAVRILIAK S.J., Dielectric and Mechanical Relaxation in Materials Carl Hanser Verlag, Munich Vienna New York, 1997