MONITORING DEVICE FOR DETERIORATION OF ZINC OXIDE TYPE LIGHTNING ARRESTER

摘要

PURPOSE:To provide a deterioration monitoring device for a Zn oxide type lightning arrester, with which the deteriorated state can be judged accurately and simply and automated operation be achieved easily because of no need for fine adjustment for the current corresponding to capacity, etc. CONSTITUTION:A lightning arrester deterioration monitoring device comprises a Zn oxide type arrester 1 in connection with one phase of a power line, a current transformer 4 to sense the leak current 1 of the arrester 1, a capacitor type transformer 6 to sense the voltage of the phase where the arrester 1 is connected, and a deterioration judging device 15' to calculate the time-basis integral of the product of output signals from these current transformer 4 and capacitor type transformer 6 and judge the degree of deterioration of the arrester 1 from the integral values.