| 摘要 |
PURPOSE:To reduce secondary current quickly to zero and open a secondary side breaker more quickly, by switching a primary current command vector to the vector to reduce the secondary current to zero. CONSTITUTION:From a controller 12, the output of primary current command i'1b is generated so that a winding type induction machine 1 may come to specified rotational frequency. Besides, from a primary current command generator 13, the output of primary current command i'1a so that the secondary current of the winding type induction machine 1 may come to zero is generated. By a current command change-over switch 11, when a breaker 3 is required to be opened, the primary current command i'1b of output generated from the controller 12 is switched to the primary current command i'1a of output generated from the primary current command generator 13. By operating a primary current command vector in this manner, the secondary current is quickly reduced to zero, and the breaker 3 can be more quickly opened. |
