Title :
On the estimation of elapsed life of oil-immersed power transformers
Author :
Pradhan, Manoj Kumar ; Ramu, T.S.
Author_Institution :
Dept. of High Voltage Eng., Indian Inst. of Sci., Bangalore, India
fDate :
7/1/2005 12:00:00 AM
Abstract :
Inadvertent failure of power transformers has serious consequences on the system reliability, economics, and the revenue accrual. An accurate estimation of transformer life can, to a very large extent, mitigate the problems, besides satisfying the conflicting requirements of optimum utilization of the equipment and safeguarding the reliability. In this endeavour, the authors have planned long duration aging experiments on scaled-down (prorated) models of a transformer, incorporating all of the essential features of actual equipment under normal operating electric stress and accelerated thermal stress. In continuation of the authors´ earlier experimental investigations, an elapsed life assessment study has been instituted by acquiring insulation-aging data under accelerated thermal stresses.
Keywords :
ageing; power transformer insulation; reliability; remaining life assessment; thermal stresses; transformer oil; elapsed life estimation; electric stress; insulation-aging data; oil-immersed power transformer failures; revenue accrual; scaled-down models; system economics; system reliability; thermal stress; Accelerated aging; Acceleration; Life estimation; Oil insulation; Power generation economics; Power system economics; Power system reliability; Power transformer insulation; Power transformers; Thermal stresses; Carbon oxides; degree of polymerization; elapsed life; empirical model; furfurals; transformer insulation;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2005.848663