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기능성 경사 재료의 적용을 통한 진공 인터럽터의 삼중점 전계 완화
최승길,구치욱,주흥진,Choi, Seung-Kil,Gu, Chi-Wuk,Ju, Heung-Jin 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.10
A vacuum Interrupter (VI), a core part that composes the breaking part of medium-voltage vacuum circuit breaker (VCB), has the excellent insulation performance and arc-extinguishing capability. $SF_6$ gas had been used for the external insulation of VIs since the dielectric strength of $SF_6$ gas is superior to that of other insulation gases. However, because of environmental problems related with global warming, a solid-insulated technology was recently researched. The functionally graded material (FGM), as changing spatially the distribution of the relative permittivity inside an insulator, can reduce the electric field stress at the specific region. Especially, the external insulation performance of the VI with the molded FGM insulator is greatly improved as compared with that of the existing VI or the VI with a new external shield. In this paper, the effectiveness of this FGM insulator is verified by the numerical simulation.
황휘동,구치욱,정경재,최재명,김곤호,고광철,Hwang, Hui-Dong,Gu, Chi-Wuk,Chung, Kyung-Jae,Choe, Jae-Myung,Kim, Gon-Ho,Ko, Kwang-Cheol 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.6
The conducting current of non-uniform plasma immersed electrode consists of ion current and secondary electron emission current caused by the impinging ion current. The ion current is determined by the ion dose passing through the sheath in front of electrode and the ion distribution in front of the electrode plays an important role in the secondary electron emission. The investigation of the distributed plasma and secondary electron effect on electrode ion current was carried out as the stainless steel electrode plugged with quartz tube was immersed in the inductively coupled Ar plasma using the antenna powered by 1 kw and the density profile was measured. After that, the negative voltage was applied by 1 kV~6 kV to measure the conduction current for the analysis of ion current.
장한기,구치욱,윤덕원,최영훈 한국소음진동공학회 1999 소음 진동 Vol.9 No.4
Rubber mounts so called grommets and pipes are two major paths of vibration transmission from a compressor, an important vibration source in an air conditioner, to the whole unit. A procedure of configuring the suction and discharge pipes of the compressor was developed in this paper so as to reduce the vibration transmission through the pipes as well as the grommets. Through investigating the effects of shapes and connecting disrections of pipe elements on vibration transmission, a guideline to configure the pipe layout, which enables to reduce vibration transmission, was proposed. The initial pipe layout by the guideline was optimized with the objective function, minimization of boty vibration transmission and the cost, and with the constraints to yield the final dimensions of the pipes. The procedure not only minimizes the transmitted force to the circumferential devices but enables to eliminate rubber blocks or dampers, which are generally used to avoid resonances of the pipe system.
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.