| 摘要 |
PURPOSE:To simplify the constitution of detection circuit to protect the electrical and mechanical parts from leak water high moisture, by holding the insulator with a pair of metal plates, applying direct-current voltage between metal plates, and utilizing the phenomenon of deterioration of electric insulation due to migration and growth of silver in the insulator. CONSTITUTION:A leak water high moisture detecting element 11 is placed between copper electrode plates 14a, b, as shown in the detailed drawing, with a member, such as dipolar phenol resin, which produces silver migration phenomenon, inserted in the middle, and the spacing of the both electrode plates is determined by the silver migration-growth period of the substance. Direct- current voltage is applied to terminals 16a, b which are led out from the electrodes 14a, b of the element 11, and connected to an external alarm circuit by way of a detection output terminal 13 from a circuit 12 to detect short circuit of the electrodes. Depending on the electrode spacing distance and applied voltage, the element 11 can adjust the electrode short circuit time, which ranges from slow detection to rapid detection. Utilizing the insulation deterioration due to silver migration phenomenon, this leak water high moisture detecting device is finally set in short-circuited state so as to be free from malfunction. Therefore, the signal from the element 11 is stable, and the detection circuit may be simplified. |
