Prevention of high-fault rupture of pole-type distribution transformers
- 1 September 1975
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems
- Vol. 94 (5) , 1698-1707
- https://doi.org/10.1109/t-pas.1975.32013
Abstract
Violent rupture of distribution transformers has occurred with increasing frequency in recent years. The problem appears greatest with pole-type units at locations with high available short-circuit currents. This paper concerns the rupture of pole-type distribution transformers subjected to internal, submerged, arcing faults of high current magnitude. An analysis of a probable rupture process and tests of faulted transformers were used to obtain a simple semi-empirical equation for the internal transformer pressure rise. Limiting the I2t during the fault with current limiting fuses is shown to be a practical means of minimizing the probability of transformer rupture.Keywords
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