Abstract: The progress of the research on hot point temperature indirect measurement method for transformer winding in operation was introduced. According to the establishing features, the computation models of hot point temperature indirect measurement method were reduced to several categories, which are based on the technical standard, the heat resistance or the heat circuit respectively. The theory and the characteristics of these categories of computation models were analyzed in brief. The development direction of the research on the hot point temperature indirect measurement method of the transformer winding was prospected.

Key words: power transformer, hot point temperature of winding, temperature measurement, computation model