Improved Calculation Method for Transformer Hot Spot Temperature with Dynamic Load
This paper presents an improved model for calculating hot spot temperature based on thermo-electricity analogy theory.The outdoor solar irradiation and the influence of heat exchange between oil tank wall and environment are considered; the relationship between transformer loss and different tap is calculated; the change of oil viscosity and load loss with temperature is taken into account.The calculation results are compared with an ONAF 220kV-300MVA transformer factory test data and results of a classic hot spot temperature calculating model,which indicates that the improved model has higher accuracy under dynamic load.
oil-immersed transformerhot spot temperaturethermo-electricity analogyoil tank wallload tap
NETL
NSTL
万方数据
维普
