巻線温度シミュレーションを用いた変圧器固有の運転指針

抄録

Many power transformers in Japan have been operated under the standard of JEC-2200(Power Transformer) and “Loading Guide for Oil immersed Transformers” (No. 143: Technical Report of The Institute of Electrical Engineers of Japan), when it is necessary to operate to load more than rated conditions. On the other hand, transformers in foreign countries may have been also operated under the standard of IEC-354(Loading guide for oil-immersed power transformers) as well as in the same way in Japan.
On operating oil-immersed transformers, Technical Report No. 143 in Japan above-mentioned and IEC-354 are almost equivalent in determining permissible duties and the corresponding loss of life.
To obtain hot-spot temperature of windings in constantly varying temperature and load current, primary, secondary, electromagnetic core, and cooling material (Oil or SF₆ Gas) temperature equations are developed and solve differentially in this thesis. Then Loading Guide for individual transformer is come to realize since it has been thought to be complicate to make individual loading guides for each transformer.