| Title |
Electrical Properties of 18[㎸] ZnO Surge Arrester Stressed by the Mixed DC and 60[㎐] AC Voltages |
| Authors |
Su-Bong Lee ; Seung-Ju Lee ; Bok-Hee Lee |
| Keywords |
Zno surge arrester ; Mxed voltage ; Leakage current ; Cross-over phenomenon |
| Abstract |
This paper describes the characteristics of power loss and leakage currents flowing through new and used 18[㎸] zinc oxide (ZnO) surge arrester under the mixed DC and AC voltages. The mixed DC and AC voltage generator of 50[㎸] peak was designed and fabricated. The I-V curves of ZnO surge arrester were measured as a function of the voltage ratio K The I-V curves under the mixed DC and AC voltages lay between the pure DC and AC characteristics, and the cross-over phenomenon in both I-V curves and R-V curves was observed at the low current region. As a result, the increase of DC component in the mixed volmges causes the increase of resistive component of total leakage current of ZnO surge arrester. Also, in the case of same applied voltage, the leakage current flowing through the used ZnO surge arrester was higher than that of the new ZnO surge arrester. |