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차영광,이일회,주흥진,신태용,박경태,Cha, Young-Kwang,Lee, Il-Hoi,Ju, Heung-Jin,Shin, Tae-Yong,Park, Kyong-Tae 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1
Copper-chromium alloys have been used as contact materials of vacuum interrupters in circuit breakers, but new materials with highly stable performance are required to break the high voltage and high current barrier due to the recent increase in breaking capacity. In this paper, a new contact material was fabricated from a ternary alloy instead of existing Cu-Cr alloys. Its breaking performance and endurance were verified from a synthetic test and compared with that of various contact materials. The test results verified that the breaking performance of the new contact material was excellent.
실드 컨디셔닝을 통한 29kV 20kA 진공인터럽터의 절연성능 개선 연구
차영광,전기범,이일회,구치욱,주흥진 대한전기학회 2023 전기학회논문지 Vol.72 No.12
In order to improve the dielectric performance of vacuum interrupter, various conditioning method have been used. Among them, AC conditioning is most commonly used because the method is simple and high effects can be obtained in a short time. AC conditioning has a very high effect on smoothing the electrode surface by opening the electrode and applying a high voltage to the electrode to remove microscopic protrusions impurities on the electrode surface. However, since discharge generated inside the vacuum interrupter occurs not only between electrodes but also between the electrode and the main shield, conditioning of the shield is also required. In general, shield conditioning using AC voltage applies a method of applying a high voltage to the shield of vacuum interrupter directly, but since the distance between the electrode and the shield is larger than that between the electrodes, high voltage application is required and de-conditioning effect may occur. In this study, to solve this problem, the conditioning of the shield was carried out at the part stage before the production of the product and the effect was proved. It was confirmed that the withstand voltage performance was stabilized faster when the shield conditioning was performed at the part stage, regardless of whether the shield conditioning was performed at the product stage.
진공인터럽터의 내전압 성능 향상을 위한 전류컨디셔닝 기법 연구
차영광,이일회,전기범,장지훈,주홍진 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.5
As a process to improve the insulation performance of VIs (Vacuum Interrupters), AC voltage conditioning is generally adopted by many manufacturers. Although the insulation performance is enhanced easily with AC Voltageconditioning, it has limitations when high recovery voltage is required due to high voltage rate or capacitive current switching. In particular, impurities such as oxides segregated on the electrode surface can be removed not by the energy level of the voltage conditioning but by the higher energy level achieved by the current conditioning process In this article, the current conditioning was carried out in various conditions and its validity was examined. The current conditioning was processed by changing the amplitude of applied current, arc time, the number of tests, and frequency. The insulation performance and the status of contact surface were checked as well. We concluded that as the applied charge quantity and the conditioning coverage area increase, the conditioning effect is much higher.
최대 전압 12 kV, 커패시턴스 50~500 pF 가변 진공커패시터 개발
차영광 ( Youngkwang Cha ),이일회 ( Ilhoi Lee ),전기범 ( Kibeom Jeon ),장지훈 ( Jihoon Jang ),주흥진 ( Heungjin Ju ),최승길 ( Seungkil Choi ) 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.3
A variable vacuum capacitor (VVC), which is a variable element, is used to match impedance in plasma that changes with various impedance values, and its use is expanding with the rapid growth of the semiconductor business. Since VVCs have to secure insulation performance and vary capacitance within a compact size, electrode design and manufacturing are very important; thus, various technologies such as part design and manufacturing technology and vacuum brazing technology are required. In this study, based on the model of an advanced foreign company that is widely used for impedance matching in the manufacture of semiconductors and displays, a VVC that can realize the same performance was developed. The electrode part was designed, the consistency was confirmed through analysis, and the precision of capacitance was improved by designing a cup-type electrode to secure the concentricity of the electrode. As a result of the evaluation, all requirements was satisfied. We believe that self-development will be possible if satisfactory responses are received through evaluation by VVC consumers in the future.