| 摘要 |
PURPOSE:To detect easily and precisely the deterioration of a lightning arrester by detecting the deterioration due to the temperature difference between the characteristic element of a nonlinear resistor and the circumference. CONSTITUTION:The lightning arrester 1 consists of the characteristic element 4 of the nonlinear resistor of a zinc oxide material superior in nonlinear resistance characteristic, a bushing 5 with a flange 5, stopper plates 6 and 7 for upper and lower parts, metallic fixtures 8 and 9, etc. The temperature difference between temperature measurement points 9 and 10 of the element 4 and its circumference is detected through thermocouples 11 and 12 and temperature difference detector 13, and when the temperature difference exceeds a specific value, it is decided that the thermal characteristics of the element 4 vary, displaying the deterioration of the lightning arrester 1 on a deterioration display device 14. Those characteristic element which eliminates the need for leak current detection, etc., and the system which detects the temperature difference from the circumference detects easily the deterioration of the lightning arrester with high precision.
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