| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an abnormality detection device which dispenses with signal lines used for connecting to places where abnormality occurrence needs to be monitored. <P>SOLUTION: A control device 34 of each power conditioner is made to function as an abnormality detection device. The control device 34 includes a detection value comparison unit 341 and an input voltage comparison unit 342. The detection value comparison unit 341 compares solar radiation intensity IRR detected by an actinometer 5 with prescribed solar radiation intensity IRR<SB POS="POST">0</SB>. When the result of comparison by the detection value comparison unit 341 is (IRR>IRR<SB POS="POST">0</SB>), the input voltage comparison unit 342 determines whether voltage values V<SB POS="POST">i</SB>(i=1, 2, and so on) fed into from each voltage sensor 33 are smaller than a prescribed voltage value V<SB POS="POST">0</SB>. When V<SB POS="POST">i</SB>is determined to be smaller than V<SB POS="POST">0</SB>by the input voltage comparison unit 342, the control device 34 determines that opening abnormality has occurred in a DC switch corresponding to the voltage value V<SB POS="POST">i</SB>. Therefore, signal lines used for connecting to respective DC switches are unnecessary. <P>COPYRIGHT: (C)2013,JPO&INPIT |
