Substation-transformer emergency overloading practice

Although much has been written in recent years regarding allowable overloading of transformers, the practical matter of matching existing load curves with such allowable limits has continued to present some difficulties. The interim report of the AIEE transformer subcommittee gives one approach to the problem, taking into account the ambient temperature and the duration of the overload. However, in order to take full advantage of the transformer´s inherent load-carrying ability, it is necessary to consider additional factors such as the individual transformer characteristics and the specific shape of the overload curve.