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HVDC 인가에 따른 고체 절연물 부분방전 및 누설전류 특성 연구
이헌경(Heon-Gyeong Lee),장경민(Kyeong-Min Jang),김진규(Jin-Gyu Kim) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.7
In recent years, research on HVDC transmission has been actively carried out for Super Grid, which is power-linked with overseas power system. Therefore, it is necessary to study the failure caused by HVDC. If leakage current and partial discharge occur in HVDC power equipment, it will cause failure and reduce the lifetime of the power equipment, so much research is required. In this study, the partial discharge and leakage current characteristics of insulating materials under HVDC condition were experimentally investigated using the electrode structure generating surface discharge. As a result of measuring the leakage current according to the insulation material and calculating the resistivity, polyethylene showed the best insulation. In the case of partial discharge, the occurrence and extinction of the discharge was repeated, and the insulation breakdown occurred.
평판형 유도전극의 대향 각도변화에 따른 EHD 특성 연구
이헌경(Heon-Gyeong Lee),정재승(Jae-Seung Jung),김진규(Jin-Gyu Kim) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.10
A cooling device utilizing ionic wind has advantage compared with conventional cooling devices with electric fan. In this paper, EHD characteristics were studied based on the angle variation of the plate type induction electrode in the needle-to-plate discharge electrode structure. The study of the angle variation of plate type induction electrode would be very useful in space application side, since it makes the ionic wind cooling device effectively be applied to various structure of electronic devices that have limited space.
산화유도시간을 활용한 고분자 절연재료의 열화 분석 연구
이헌경(Heon-Gyeong Lee),윤웅희(Ung-Hui Yun),김성훈(Seong-Hun Kim),김진규(Jin-Gyu Kim) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
In this study, the lifetime analysis according to deterioration was experimentally conducted through the oxidation induction time of insulating materials. As a result of the experiment, it was confirmed that the lifespan decreased as the deterioration progressing temperature was increased, and it was found that PE has a higher lifespan than PP at a deterioration temperature of 100℃
비등온 TGA을 이용한 절연재료의 활성화에너지 신뢰도 향상
이헌경(Heon-Gyeong Lee),윤웅희(Ung-Hui Yun),김진규(Jin-Gyu Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.10
Measuring the accurate activation energy of the insulating materials used in the HVDC environment is an essential condition for reliable prediction of the accelerated life of the insulating materials, so it is important to select various measurement models and analyze them. The activation energy of PE and PP was measured through five measurement methods through TGA, and the reliability was improved by comparing the results of each condition of the heating rate, the degree of conversion and the reaction order. Excluding the conditions that cause errors, the measured activation energy was measured to be 2% lower than the existing measurement methods, and it is thought that it will be used as a useful basic data in the field of reliability.
가속열화시험을 통한 HVDC 전력기기용 고분자 절연재료의 표면 특성 연구
이헌경(Heon-Gyeong Lee),장경민(Kyeong-Min Jang),알샤마리 아흐메드 트라이힙 아(Alshammari Ahmed Traiheeb A),김진규(Jin-Gyu Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.8
At present, new insulation design techniques in DC environment and research for improvement of insulation performance are needed for research is being conducted to apply the HVDC transmission system. Understanding the change of the surface characteristics of the polymer insulation material is useful for analyzing the mechanism of the insulation material for application to electric power equipment. In the present paper, the surface characteristics of the polymer insulation materials used in HVDC power equipment have been experimentally investigated. Based on the measured activation energy, the accelerated deterioration time was selected and the accelerated deterioration test was conducted. The surface resistivity and the contact angle were measured to understand the surface characteristics of the deteriorated insulation materials and compared with those before the deterioration.
이헌경(Heon-Gyeong Lee),김진규(Jin-Gyu Kim) 한국조명·전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.4
The existing insulation material degradation analysis was mainly conducted using the method through the international standard of IEC 60126 and the thermogravimetric analyzer (TGA). Polyolefin-based materials are greatly affected by many variables such as the reaction order (n), conversion degree (α), and temperature increase rate (β) in predicting the lifetime and they have the disadvantage of requiring a lot of samples and taking a long time. exist. Therefore in this study, a relatively simple oxidation induction time (OIT) lifetime prediction was performed and compared with TGA. As a result of the measurement OIT was approximately 24 days and TGA was approximately 32 days, and it was measured similarly to the actual accelerated degradation test result.