| Title |
Characteristic Changes of ZnO Arrester Blocks by Multiple-lightning Impuse Currents |
| Authors |
길경석(Gil, Gyeong-Seok) ; 한주섭(Han, Ju-Seop) |
| Keywords |
multiple-lightning impulse currents ; lightning ground flash ; lightning arresters ; deterioration |
| Abstract |
Multiple-lightning impulse currents are a general feature of the lightning ground f=flash. It is therefore necessary for lightning arresters used in power systems to be estimated by applying not only a single-lightning impulse current but also a multiple-lightning impulse currents. This paper presents the effects of multiple-lightning impulse currents on deterioration of ZnO arrester blocks. The multiple-lightning impulse generator which can produce quadruple 8/20[μs] 5[kA] with separation time of 30~120[ms] is designed and fabricated. The total energy applied to the arrester block at each impulse is about 1,200[J]. In experiment, various parameters such as leakage current component, reference voltage, and temperature are measured with the number of applied impulse current. Also, micro-structure changes of the ZnO blocks after applying the single and the multiple-lightning impulse currents of 200 times are compared. The experimental results indicate that the types of arrester blocks are more vulnerable to deterioration or damage by multiple-lightning impulse currents. |