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최승길,김규호,Choi, Seung-Kil,Kim, Kyu-Ho 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.4
In this paper a nobel optimum design method is presented for a shield in a vacuum interrupter which is equipped in switchgear to improve its electric insulation capability. The design of Taguchi experiment method which is based on the results by finite element method is used to find optimum design conditions. The important design factors are chosen at first and the concept of signal to noise ratio is applied to evaluate the vacuum interrupter performance, and the optimal values of each parameters are determined. From the results of various analyses, it is shown that the shield plate in circuit circuit breaker compartment of switchgear can reduce the concentration of electric field intensity. This method is very useful to design the construction of a shield in a short time. Consequently, the insulation capability of circuit breaker compartment in a gas insulated switchgear is improved by adopting an additional optimized shaped shield.
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.
합리적 전력수요관리를 위한 직접부하제어 사업의 개선 방안
김규호,최승길,송경빈,Kim, Kyu-Ho,Choi, Seung-Kil,Song, Kyung-Bin 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.8
본 연구에서는 현 직접부하제어사업의 실태 및 문제점을 도출하고 국내 실정에 맞는 직접부하제어 활용 및 개선을 위하여 직접부하제어 사업 계약자를 대상으로 제도 개선사항, 지원금액 개선사항 및 제도 실시 등에 대한 설문조사를 하였다. 대표적으로 개선되어야 할 방안으로는 직접부하제어사업 참여 업체 증가를 위하여 기본지원금 및 제어지원금의 검토 방안과 소비자의 의견을 반영한 수요측 입찰 실시 방안이 필요하며, 시장운영과 계통운영에 있어서 페널티, 차단시간, 차단 횟수, 통보시간, 계약기간 등에 대한 기준을 정립할 필요가 있음을 확인하였다. This paper proposes the scheme to improve the current direct load control(DLC) program by inspecting the problems of the DLC program. In order to increase the number of the customers participating DLC program, a reduction of the base incentive and an increase of the direct load control incentive are suggested based on the interruption cost of electric power considering the characteristics of load types and the introduction of demand side bidding is recommended. Secondly, the standards of power system operations is required to control DLC program efficiently for the penalty, interruption times, the number of interrupting loads, notice time for the load interruption and the periods of the DLC program contract.
구형 집속 빔 핵융합 장치에서 그리드 음극 구조의 최적 설계
주흥진,박정호,황휘동,최승길,고광철,Ju, Heung-Jin,Park, Jeong-Ho,Hwang, Hwui-Dong,Choi, Seung-Kil,Ko, Kwang-Cheol 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.4
Neutron production rate in spherically convergent beam fusion(SCBF) device as a portable neutron source strongly depends on the ion current and the grid cathode structure. In this paper, as the process of design and analysis, Design of Experiment(DOE) based on the results by Finite Element Method-Flux Corrected Transport(FEM-FCT) method is employed to calculate the ion current. This method is very useful to find optimal design conditions in a short time. Number of rings, radius of rings, and distance between the grid cathode and center are selected as control factors. From the results in the optimized model, the higher ion current is calculated and deeper potential well is also observed.
주흥진,김봉석,황휘동,박정호,최승길,고광철,Ju, Heung-Jin,Kim, Bong-Seok,Hwang, Hui-Dong,Park, Jeong-Ho,Choi, Seung-Kil,Ko, Kwang-Cheol 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.9
We have proposed a new configuration on the cathode structure to improve a neutron yield without the application of external ion sources in an inertial electrostatic confinement (IEC) device. A neutron yield in the IEC device is closely related to the potential well structure generated inside the cathode and is proportional to the ion current. Therefore, the application of a double grid cathode structure to the IEC device is expected to produce a higher ion current and neutron yield than at a single grid cathode due to a high electric field strength generated around the cathode. These possibilities were verified as compared with the ion current calculated from both shape of the single and double grid cathode. Additionally from the results of ion's lives and trajectories examined at various outer cathode voltages and grid cathode configurations by using particle simulations, the validity of the double grid cathode was confirmed.