What is it about?

In this paper, a simple reliability model of power transformers is developed with the help of field data that place in evidence, dominating failure modes and mechanisms.

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Why is it important?

Field data failures distribution indicates a dominance of failure modes pertaining to winding insulation, tank oil, load tap changers (LTCs) and bushings. From a reliability point of view, the transformer system consists of four main parts such as winding inter-turn insulation, tank oil, LTCs and bushings.


On this basis, a reliability block diagram of the transformer system is built from a series configuration comprising the above mentioned parts. The reliability functions developed for all parts will yield together to the transformer system reliability.

Pr Hamid Bentarzi
Universite M'Hamed Bougara Boumerdes

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This page is a summary of: Large power transformer reliability modeling, International Journal of Systems Assurance Engineering and Management, May 2014, Springer Science + Business Media,
DOI: 10.1007/s13198-014-0261-2.
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