| 摘要 |
PURPOSE:To efficiently and finely operate unit coolers by a method wherein a plurality of unit coolers are divided into the plural groups of reference operating groups and additional operating groups and these groups are successively replaced every fixed time. CONSTITUTION:A plurality of unit coolers are equally divided into plural groups, for example, A-C. Furthermore, one of the groups is assigned as a reference operating group 23 which is surely operated at the time of operating the main substance of a transformer and the other groups are assigned as additional operating groups 24, 25 which are additionally operated under a fixed condition, for example, by increasing a load against the transformer. A control device supplies the operating group 23 with an operating command in accordance with the operation of the main substance of the transformer and also supplies the operating group 24 with a command when a fixed condition is completed. Furthermore, the control device supplies the operating group 25 with an operating command when another fixed condition is completed. When the unit coolers receive output signals followed by the arrival of setting time from a long timing timer, replacement is made so that the A, C, and B groups of the operating groups 23, 24, and 25 may be B, A, and C groups of the operating groups 23, 24, and 25. |
