| 摘要 |
PURPOSE:To perform highly reliable abnormality monitoring for an opening/ closing equipment by generating an abnormality detecting signal in the case of detecting two or more abnormal phenomena among heating, cracked gas, partial discharge and the like following abnormal current-carrying. CONSTITUTION:When local heating and cracked gas are detected, operation of judgement circuit 12 and 13 allows as AND-gate 20 to function. When the cracked gas and partial discharge are detected, operation of the circuit 13 and an OR-gate 19 permits an AND-gate 22 to function. When the partial discharge and the local heating are detected, operation of the gate 19 and the circuit 13 causes an AND-gate 21 to function. When all of the local heating, the cracked gas and the partial discharge are detected, operation of the circuit 12 and 13 and the gate 19 leads to function of the gates 20, 21 and 22, thereby generating an output signal. Another OR-gate disposed in a final step can generate an output signal when either one of the gates 20, 21 and 22 operates. |
