Study on Design Standard of Distribution Transformers considering Economic Efficiency and CO2 Emissions

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  • Yamada Tomoyuki
    Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo
  • Takagi Masaaki
    Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo
  • Yamamoto Hiromi
    Socio-economic Research Center, Central Research Institute of Electric Power Industry
  • Yamaji Kenji
    Research Institute of Innovative Technology for the Earth (RITE)

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  • 経済性とＣＯ２排出量を考慮した受電用変圧器設計の検討
  • ケイザイセイ ト CO2 ハイシュツリョウ オ コウリョ シタ ジュデンヨウ ヘンアツキ セッケイ ノ ケントウ

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Abstract

No load loss of amorphous transformer (i.e. amorphous metal-based transformer) could be reduced by about 70% compared with traditional transformers (e.g. silicon steel-based transformer). Amorphous transformers have the potential to realize large amount of energy savings and reduction of CO2. However, amorphous transformers have disadvantages of high initial costs and high load loss parameters compared with traditional transformers. In Japan, JIS (Japanese industrial standards) set two regulations about efficiencies of transformers. One is a regulation about amount of total loss at equivalent load factor Pe = 40%, which is made to improve efficiency in actual usage. The other is a regulation about efficiency of rated load (Pe = 100%).<br>Authors propose an optimal design of transformers considering trade-off between the material cost and power loss cost with taking into account the standard in the rated load. Economies of transformers are evaluated in the paper by the sum of the initial cost and the power loss cost.<br>Simulation results show that the two regulations about efficiency of JIS are not reasonable. If there were not the regulation in the rated load, we could design low initial cost and environmentally compatible transformers.

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