DocumentCode :
3391991
Title :
A Model for the Temperature Distribution in Resin Impregnated Paper Bushings
Author :
Jyothi, N.S. ; Ramu, T.S.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Sci., Bangalore, India
fYear :
2012
fDate :
27-29 March 2012
Firstpage :
1
Lastpage :
4
Abstract :
Resin impregnated paper (RIP) is a relatively new insulation system recommended for the use in transformer bushings. In the recent past, RIP has acquired prominence as insulation in bushings, over conventional oil impregnated paper (OIP), in view of its overwhelming advantages the more important among them being low dielectric loss and possibility for positioning the bushing at any desired angle over the transformer. In addition, the fact that such systems do not pose problems of fire hazard is counted as a very important consideration. The disadvantage of RIP compared to OIP, however, is its much higher cost and involved manufacturing process. The temperature rise in RIP bushings under normal operating conditions is seen to be a difficult parameter to control in view of the limited options for effective cooling. It is therefore essential to take serious note of this aspect, to arrest rapid deterioration of bushing. The degradation of dry- type insulation such as RIP is often due to thermal stress. The long time performance thereof, depends strongly, on the maximum operating temperature. With this in view, the Authors have developed a theoretical model and computational method to study the temperature distribution in the body of insulation. The Authors consider that the basis for the model as being the temperature and electric stress aided AC conductivity. The ensuing heat balance (continuity) equations in 2-D cylindrical geometry are treated as a Dirichelet-Neumann boundary value problem.
Keywords :
bushings; geometry; power transformer insulation; resins; transformer oil; 2D cylindrical geometry; AC conductivity; Dirichelet-Neumann boundary value problem; OIP; RIP bushings; computational method; cooling; cost manufacturing process; dielectric loss; dry-type insulation; electric stress; fire hazard problems; involved manufacturing process; oil impregnated paper; resin impregnated paper bushings; temperature distribution; thermal stress; transformer bushings; Conductivity; Dielectrics; Equations; Insulators; Mathematical model; Temperature distribution;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power and Energy Engineering Conference (APPEEC), 2012 Asia-Pacific
Conference_Location :
Shanghai
ISSN :
2157-4839
Print_ISBN :
978-1-4577-0545-8
Type :
conf
DOI :
10.1109/APPEEC.2012.6307302
Filename :
6307302
Link To Document :
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