| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system linkage protection device that can surely and easily detect and protect the single operation of a regular use generating set during system linkage at the side of the regular use generating set, without the need for arranging an expensive transfer breaker. <P>SOLUTION: The voltage of a synchronous motor 10 is largely changed by changing an output voltage downward when the rate of the frequency change of the synchronous motor 10 is positive, and changing the output voltage upward when the rate of the frequency change is negative, thus determining the single operation when the polarity of a voltage change rate and the polarity of a voltage oscillation signal coincide with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
