An Arrester Diagnosis by Measurement of Surface Temperature

초록

A surface temperature of ZnO arresters as a function of ambient temperatures and leakage currents, and a variation of the leakage current according to the change of ambient temperatures as a seasonal characteristic were experimentally studied. The variations of the leakage current in range of -20 ℃ ~ 50 were below 10 ℃ ㎂, which comes about 4.5 % of the normal leakage current. Temperature difference between the ambient and the surface of arresters did not appear until 150 % to the normal leakage current, and appeared remarkably over 200 % of it. From the experimental results, we propose a polynomial to estimate the leakage current by measuring temperature difference of them. Tests on the used arresters showed the same results as the experimental ones.

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