Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
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
Page pp.643-648
ISSN 1975-8359
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°.