All-acoustic PD measurements of oil/paper-insulated transformers for PD-localization

• Autorzy: Markalous S. 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

Dealing with all-acoustic online PD measurements of oil/paper-insulated transformers one encounters two main tasks. First is detection of a PD and its distinction from impulse-shaped acoustic disturbances in terms of a monitoring decision "PD-yes/no". Second is the localization of the PD which is needed e.g. for risk assessment. There one has to give the acoustic amplitude a relation to the electrical amplitude and get an appropriate Picocoulomb (pC) value for considerations concerning deterioration. In case of doing computations with traveling times an exact all-acoustic geometric localization of the PD origin needs at least four sensor signals. Two variants for the system of non-linear observation equations with four unknowns can be distinguished. Working with time-differences starting from a first-hit reference sensor gives three unknown coordinates in space and an unknown time origin. Another approach presented is stating the system of equations in a GPS (Global Positioning System) form handling pseudo-times. In this case three coordinates and a receiver time offset constitute the unknowns.

Słowa kluczowe

EN

acoustic PD measurements; online PD localization; non-linear observation equations; time-differences; pseudo-time approach; iterative solver algorithms; direct solution strategies

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 106--112
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Markalous S. M.

• 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

• [1] AWANGE J.L., GRAFAREND E.W., Algebraic Solution of GPS Pseudo-Ranging Equations, Journal of GPS Solution, Vol. 5(4), 2002
• [2] BANCROFT S., An algebraic solution of the GPS Equations, IEEE Transactions on Aerospace and Electronic Geodaetica, Vol. AES-21, 1985
• [3] GROSSMANN E., FESER K., Improvement of sensitivity in online PD-measurements on transformers using acoustic emission techniques (AET), 12th International Symposium on High Voltage, Bangalore, India, 2001
• [4] GROSSMANN E., Akustische Teilentladungsmessung zur Überwachung und Diagnose von Öl/Papier-isolierten Hochspannungsgeräten, Dissertation, University of Stuttgart, 2002
• [5] HOWELLS E., NORTON E.T., Parameters affecting the velocity of sound in transformer oil, IEEE Transactions on Power Apparatur and Systems, Vol. PAS-103, No. 5, May 1984
• [6] HUBER R., Integriertes Überwachungskonzept für Groβtransformatoren unter mehrstufigem Einsatz von offline und online Methoden, Micafil Symposium, Stuttgart, Germany, 2004
• [7] KRAUSE L.O., A Direct Solution of GPS-Type Navigation Equations, IEEE Transactions on Aerospace and Electronic Systems 23, 1987
• [8] KLEUSBERG A., Analytical GPS navigation solution, Quo vadis geodesic...? Festschrift for E. W. Grafarend on the occasion of his 60th birthday, Eds. F. Krumm and V. S. Schwarze, Report Nr. 1999.6-I, 1999
• [9] MARKALOUS S.M., GROSSMANN E., FESER K., Online acoustic PD-measurements of oil/paper-insulated transformers- methods and results, 13th International Symposium on High Voltage, Delft, Netherlands, 2003