| Title |
A Study of Corona Discharge in Polymer Insulators by Artificial UV Radiation |
| Authors |
김영석(Kim, Y.S.) ; 최명일(Choi, M.I.) ; 김종민(Kim, C.M.) ; 방선배(Bang, S.B.) ; 송길목(Shong, K.M.) ; 곽동순(Kwag, D.S.) |
| DOI |
https://doi.org/10.5370/KIEE.2013.62.5.643 |
| Keywords |
UV radiation ; UV detection ; Polymer insulator ; Surface discharge ; Contact angle |
| Abstract |
In this study, degradation was observed by irradiating UV rays to the polymer insulators which have been widely used in outdoor electric power facilities. For an indoor accelerated UV test, 0.55 w/m2 of UV rays were applied using a xenon-arc method. A UV detection system with 65 φmm in diameter, 100 mm in length and 1.0 of brightness (F/#) has been designed. Even though efflorescence on the surface of polymer insulators wasn't observed according to the accelerated UV test. UV rays were detected at around 50% and 40% of insulation breakdown in EPDM and silicone-type insulators respectively. As degradation continued because of an indoor accelerated UV test, breakdown voltage with which UV rays can be detected in an early stage decreased as well. A silicone polymer insulator would be severer than EPDM polymer insulator in terms of surface degradation because of UV strength against V_m/V_{BD} was high in silicone polymer insulators. UV strength in silicone-type insulators increased at 1,000 kJ/m^2 because contact angle at the intial stage sharply decreased to from 113° to 92.1°. |