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Wei B.-G.,East China Electrical Testing and Research Institute | Lin J.,East China Electrical Testing and Research Institute | Tan L.,Xian Jiaotong University | Gao K.,East China Electrical Testing and Research Institute | And 3 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2012

This paper proposed an improved temperature prediction model for oil-immersed transformer. The influences of the environmental temperature and heat-sinking capability changing with temperature were considered. When calculating the heat dissipation from the transformer tank to surroundings, the average oil temperature was selected as the node value in the thermal circuit. The new thermal models will be validated with the delivery experimental data of three transformers: a 220 kV-300 MV·A unit, a 110 kV-40 MV·A unit and a 220 kV-75 MV·A unit. Meanwhile, the results from the proposed model were also compared with two methods recommended in the IEC loading guide. Source

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