Research on Overload Capability of Dry Distribution Transformer Based on Hot Spot Temperature Model

When the dry distribution transformer is overloaded, the internal temperature will rise abnormally, resulting in aging of the transformer insulation and a decrease in service life. Based on the hot temperature function relationship in GB/T 1094. 12-2013 standard, under the continuous load and transient load, the transformer overload capability is studied and analyzed respectively. The theoretical analysis of life loss and the relationship between the allowable overload time of the transformer and the allowable overload ratio is obtained.