The breakdown voltage of insulation oil under the influences of humidity, acidity, particles and pressure.

• Autorzy: Koch M. , Fischer M. , Tenbohlen S.
• Konferencja: APTADM 2007, III International Conference on Advances in processing Testing and Application of Dielectric Materials., September, 26-28, 2007 Wrocław, Poland
• Języki publikacji: EN

Abstrakty

EN

The breakdown voltage of mineral insulation oil was systematically investigated under the influences of moisture, acidity, pressure and particles. The standards IEC156/95 (VDE0370/Part5/96 and ASTM D1816) specified the test conditions! Moisture provides charge carriers, therefore a moisture saturation of 0 to 20 prec. decreases the breakdown voltage from 72 down to 61 kV. Acids as aging products decrease the dielectric strength too for the same reason. Not the total acid number TAN, but the low molecular acids effect the major decrease. Since the breakdown process starts with a microscopic bubble, an increasing pressure increases the breakdown voltage too. The observed asymptotic behaviour seems to come to a maximal end value of the breakdown voltage at around 150 kV. Under-intlation supports bubble generation, decreasing the dielectric withstand strength. Dry particles (cellulose fibres) decrease the breakdown voltage only at under-inflation, nearly no influence was observed at atmospheric pressure.

Słowa kluczowe

EN

mineral oil; breakdown; particles; acidity; humidity; pressure

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2007
• Tom: Vol. 46, nr 19
• Strony: 98--103
• Opis fizyczny: Bibliogr. 2 poz.

Twórcy

autor

Koch M.

autor

Fischer M.

autor

Tenbohlen S.

• LEH University of Stuttgart

Bibliografia

• [1] Butcher M., Mechanisms of charge conduction and breakdown in liquid dielectrics, Ph.D. dissertation, Graduate Faculty of Texas Tech University 2005, http://hdl.handle.net/2346/1342.
• [2] Koch M., Tenbohlen S., Ein neues Verfahren zur Online-Feuclitemessung in Leistungstransformatoren" ETG Fachtagung „Diagnostik elektrotechnischer Betriebsmittel" 19-20 September 2006, Kassel, ETG Fachbericht 104.