| Title |
Deterioration Characteristics of ZnO Surge Arrester Blocks for Power Distribution Systems Due to Impulse Currents |
| Authors |
Bok-Hee Lee ; Sung-Cheol Cho ; Soon-Man Yang |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2013.27.3.079 |
| Keywords |
Lightning ; ZnO Surge Arrester ; Combined DC and AC Voltages ; Leakage Current ; Cross-Over Phenomenon ; Leakage Current-Voltage Curve |
| Abstract |
In order to analyze the electrical performance of ZnO surge arresters stressed by the combined DC and AC voltages that are generated in DC/AC converter systems, the leakage current properties of ZnO surge arrester blocks deteriorated by impulse currents were investigated. The test specimens were deteriorated by the 8/20㎲impulse current of 2.5kA and the leakage currents flowing into the deteriorated zinc oxide(ZnO) arrester blocks subjected to the combined DC and power frequency AC voltages are measured. As a result, the leakage currents flowing through deteriorated ZnO surge arrester blocks were higher than those flowing through the fine ZnO surge arrester blocks and the larger the injection number of 8/20㎲impulse current of 2.5kA is, the greater the leakage current is. The leakage current-voltage curves(I-V curves) of the fine and deteriorated ZnO surge arrester blocks stressed by the combined DC and AC voltages show significant difference in the low conduction region. Also the cross-over phenomenon is observed at the voltage close to the knee of conduction on plots of I-V curves. |