| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switch monitoring device which can easily detect an irregular switching of a switch. <P>SOLUTION: The switch monitoring device is provided with an individual phase inputting means 15 to input a voltage of each phase of a switch secondary side of a three phase AC circuit, a zero point detecting means 16 to detect a zero point from a voltage waveform obtained from the individual phase inputting means 15, a waveform comparing means 17 to compare the individual voltage waveform based on the zero point detected by the zero point detecting means 16, a controlling value acknowledging means 19 to acknowledge a controlling value in accordance with a controlling value input from outside, a controlling value comparing means 18 which compares a waveform variation result obtained by the waveform comparing means 17 with a controlling value of the controlling value acknowledging means 19 and obtains a variation of each of the phases and a warning unit 20 to output a warning when the variation obtained by the controlling value comparing means 18 exceeds the controlling value peculiar to the switch. <P>COPYRIGHT: (C)2008,JPO&INPIT |
