The influence of temperature and aging of cellulose on water distribution in oil-paper insulation

This paper deals with the problem of moisture in the transformer insulation system. The author proposed that apart from the temperature, the uneven aging of cellulose insulation may have a substantial effect on moisture distribution. The main goal of the research was to check the influence of the degree of aging of winding paper on moisture distribution by taking into account temperature distribution. New paper and paper at three different stages of aging were tested. The obtained results confirmed the hypothesis - it was proven that the uneven aging of insulation may enhance moisture distribution in the insulation system.

[1]  A. W. Stannett,et al.  A review of paper aging in power transformers , 1985 .

[2]  Oleg Roizman,et al.  Moisture equilibrium and moisture migration within transformer insulation systems , 2008 .

[3]  S. R. Lindgren,et al.  Bubble evolution from transformer overload , 2001, 2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294).

[4]  A. Graczkowski,et al.  Assessment of Insulation State of Power Transformer after 35 years of Operation Using Different Diagnostic Methods , 2005 .

[5]  Stefan Tenbohlen,et al.  Dielectric Response Diagnoses For Transformer Windings , 2010 .

[6]  C. Ekanayake,et al.  Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics , 2006, IEEE Transactions on Power Delivery.

[7]  I. Fofana,et al.  Water in Oil-Filled, High-Voltage Equipment, Part I: States, Solubility, and Equilibrium in Insulating Materials , 2007, IEEE Electrical Insulation Magazine.

[8]  P Przybylek,et al.  The influence of cellulose insulation aging degree on its water sorption properties and bubble evolution , 2010, IEEE Transactions on Dielectrics and Electrical Insulation.

[9]  I. Fofana,et al.  Water in oil-filled high-voltage equipment part II: water content as physicochemical tools for insulation condition diagnostic , 2007, IEEE Electrical Insulation Magazine.

[11]  A. Choroszucho,et al.  Rozpuszczalność wody w cieczach izolacyjnych w aspekcie badania ich zawilgocenia przy użyciu sondy pojemnościowej , 2012 .