The magnetic circuit and windings are the principal sources of losses and resulting temperatures in various parts of a transformer. The losses in the core and the windings, and the stray losses due to leakage and high current fields, are mainly responsible for heat generation within the transformer. Sometimes loose electrical connections inside the transformer, leading to a high contact resistance, cause higher temperatures. Excessive temperatures due to heating of curb bolts, that are in the path of a stray field, can damage gaskets (refer to Chapter 5). The heat generated due to all these losses must be dissipated without allowing the core, winding, and structural parts of the transformer to reach temperatures that will cause ...
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