| 摘要 |
PROBLEM TO BE SOLVED: To readily detect a single operation of non-utility generation equipment and to suppress heat generation. SOLUTION: A single operation detecting device comprises: a current detector 10 mounted on a branch line 6 between a system-side distribution line 3 and a non-utility generator 8; a detecting load capacitor 22 connected to a non-utility generator side from the current detector on the branch line via a pair of IGBTs 20, 21 reciprocally connected in parallel; a load-discharge resistor 23 connected to the connection point between the IGBT and the detecting load capacitor via a switch 24; a current peak detector 12 for detecting the peak value of a current flowing to the current detector; a switch-control circuit 26 that turns on and off the pair of IGBTs at every zero-cross point during several cycles of the current, and turns off the IGBTs and at the same time turns on the switch during several cycles succeeding to the former several cycles; and a single operation determination unit 16 that determines the non-utility generation equipment to be in a single operation when the peak value of the current, which is detected by the current peak detector while the current is flowing in the detecting load capacitor, is almost same with a prescribed value. |
