| Naoki Amano | Transformer Dept., Kokubu Engineering & Product Div., Japan AE Power Systems Corporation |
| Kenichi Kawamura | Transformer Dept., Kokubu Engineering & Product Div., Japan AE Power Systems Corporation |
| Masakazu Yokoyama | Transformer Dept., Kokubu Engineering & Product Div., Japan AE Power Systems Corporation |
| Hiroaki Kojima, Dr. Eng. | 1st Dept., Power & Industrial Systems R&D Lab., Power & Industrial Systems, |
Large capacity transformers have evolved to meet the changing needs of electric power companies. For example, the need to reduce the transportation cost to the site and the trend towards smaller installation spaces have led to the introduction of on-site assembly technology. In addition, plans to double the voltage rating will increase considering future long-distance transmission, and the need for a routine supervisory system will grow as transformer operating conditions become severe due to extended operating life of equipment, overload operation, etc. Hitachi is meeting these needs with its computer analysis technology and verification testing using trial production. The result of our efforts is highly efficient large capacity transformers. In particular, we have just completed delivery of a 281.25-kV (525-kV) 1,060-MVA double-rating voltage transformer for the Hitachinaka Power Station of Tokyo Electric Power Co., Inc., as well as Hitachi's first-ever on-site assembly of transformers (500 kV 1,000 MVA) for the Chizu Substation of the Chugoku Electric Power Co., Inc. Hitachi uses the newest diagnostic technology for its apparatus supervisory system and provides rational maintenance and support.
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The Hitachi Hyoron (Japanese Only) |
large capacity transformer, on-site assembly technology, double-rating voltage transformer, preventive maintenance
