| 摘要 |
PURPOSE:To notify occurrence of abnormal state and the time arriving at a dangerous amount automatically by periodically detecting the temperature at a conductive part and the temperature and the pressure of ambient gas thereby calculating the time at which an abnormal state occurs and then substituting the immediately preceding time and detected amount for a time function thereby determining the saturation value of variation. CONSTITUTION:A noncontact conductive part temperature sensor 5 detects the temperature or the pressure of ambient gas in the place where a conductive part 3 connecting main circuit conductors 1, 2 is located, and thus detected temperature or pressure is then fed to the input section 8 of a conductive part overheat detector 7. The input section 8 performs A/D conversion at a predetermined period and delivers the output to a processing section 10. The processing section 10 determines a time function from the temperature/pressure which increases with time and detects the time at which the temperature/pressure reaches a dangerous state. Immediately preceding time and temperature/pressure are then substituted for the time function to calculate a saturation value of the temperature/pressure which is then substituted for the time function. According to the invention, the time at which the temperature/pressure to be detected reaches a dangerous state is detected easily and an alarm is outputted automatically from an overheat detecting/outputting section 11. |
