| Title |
Dielectric Characteristics of SF? and Dry-Air Gases under Lightning Impulse Voltage |
| Authors |
Feng Li ; Yang-Woo Yoo ; Dong-Kyu Kim ; Bok-Hee Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2010.24.8.142 |
| Keywords |
Dry-Air ; SF? ; Lightning Impulse Voltage ; Quasi-Uniform Electric Field ; Power Distribution Equipment |
| Abstract |
This paper describes dielectric characteristics of SF? and dry-air gases under lightning impulse voltages in a quasi-uniform electric field. In order to simulate to a quasi-uniform electric field, electric field utilization factor of the used sphere-plane electrode is 71[%]. The gas pressure of SF6 ranges from 0.1 to 0.2[㎫] and that of dry-air ranges from 0.2 to 0.6[㎫]. Electrical breakdown voltages of SF? and dry-air gases are measured and analyzed as functions of the polarity of lightning impulse voltage and gas pressure. As a result, the electrical breakdown voltage of both gases under the positive lightning impulse voltage is higher than that under the negative one. The electrical breakdown voltage in SF? is almost higher than 2.67 times compared to dry-air. The results presented in this paper can be used as a useful information to evaluate the capability of alternative insulation gases for SF6 in power distribution equipment with prominent ability against lightning surge. |