发明名称 |
POWER FLUCTUATION DETECTOR |
摘要 |
PROBLEM TO BE SOLVED: To detect a divergent tendency of power fluctuations properly for the power fluctuations including an complex amplitude waveform which occurs actually by determining that the power fluctuation tends to diverge when a difference between the present power fluctuation amplitude value and the second power fluctuation value computed within a prescribed period after the present exceeds a prescribed value. SOLUTION: A power fluctuation amplitude value computing part 18 obtains a difference between a maximum value outputted from a maximum value detecting function 17P and a minimum value outputted from a minimum value detecting function 17N, and regards the difference as a power fluctuation amplitude value to be outputted to a power fluctuation detecting function 19. The power fluctuation detecting function 19 obtains a difference between the power fluctuation amplitude value outputted from the power fluctuation amplitude value computing part 18 and a power fluctuation amplitude value outputted before a prescribed time in the same way, and determines that the power fluctuation tends to diverge when the difference exceeds a prescribed value. It is thus possible to detect that the power fluctuation tends to diverge positively even if the power fluctuation has the complex divergent tendency.
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申请公布号 |
JP2000184580(A) |
申请公布日期 |
2000.06.30 |
申请号 |
JP19980355612 |
申请日期 |
1998.12.15 |
申请人 |
TOSHIBA CORP;TOSHIBA SYST TECHNOL CORP |
发明人 |
OKUNO KOICHI;SEKIGUCHI TAKASHI |
分类号 |
G01R19/00;H02H3/42;H02H3/48;(IPC1-7):H02H3/48 |
主分类号 |
G01R19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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