| 摘要 |
PURPOSE:To reduce the electric capacity of power source equipment for driving a cascade, by dividing the cascade into a plurality of re-start units and successively performing re-starting and speed re-raising at every re-start unit. CONSTITUTION:For example, a large number of separators constituting a cascade 10 are divided into first, second, ... i-th groups and the cascade 10 is divided into a first re-start unit, a second re-start unit 22, ... i-th re-start unit 23 and re-starting and speed re-raising are successively performed at every re-start unit. Therefore, electrical load at the time of re-starting can be dispersed and, as a result, the capacity of power source equipment for driving a plant can be reduced by 20-30%.
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