A Study on the Electrical Breakdown Characteristics of Air according to Electrode Gap

Abstract – Recently in accordance with the rapid development of the industrial society, the accidents caused by dielectric breakdown have been increasing in power grid. It is important to prevent the dielectric breakdown of a high voltage apparatus to reduce the damage from electrical hazards. To establish an electrically reliable database of insulation design criteria for high voltage apparatus, a study on dielectric characteristics test is indispensable. In this study, dielectric characteristics according to field utilization factors () which are represented as the ratio of mean electric field to maximum electric field are investigated. the dielectric breakdown experiments by using several kinds of electrode systems made with stainless steel are performed by AC breakdown voltage under air-insulation. Also, the experimental results are analyzed by the Weibull distribution. As a result, it is found that the dielectric characteristics of air-insulation are determined by  as well as arrangement of electrode systems. It is considered that the results of this study would be applicable to designing the air-insulated high voltage apparatuses. Key Words : AC breakdown voltage, Dielectric characteristics, Field utilization factor, High voltage apparatus †Corresponding Author : Dept. of Electrical Engineering, Korea National University of Transportation, Chungju, KoreaE-mail : kang@ut.ac.kr*Dept. of Electrical and Electronic Engineering, Korea National University of Transportation, Chungju, Korea**Guju Technology, Inc., Chungju, Korea접수일자 : 2014년 11월 18일수정일자 : 2014년 11월 25일최종완료 : 2014년 11월 26일