Emergency overloads (or oil-insulated transformers

IN periods of high industrial activity transformer loads are generally high, and it is essential that operators know what overloads they can carry safely in emergencies. In order to do this effectively, it is necessary to know what temperatures will be reached after various overloads for different durations of time and the effects of temperature and time on the dielectric and mechanical strength of the insulation. If limitations between these things and the degree of insulation deterioration can be established, it is possible to make recommendations for safe overload times and temperatures.