• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.07a
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• pp.511-514
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• 2002

In this paper, we compared the characteristic of fault current liminting in the magnetic shielding type High-Tc superconducting fault current limiter(FCL) using both Piecewise linear magnetization curve and real magnetization one of iron core. From this paper, the characteristics of fault current limiting in both cases showed many differences. The latter has higher fault current than the former, because the saturation of iron core was reflected and more accumulated during fault. It is expected that the more exact characteristic of magnetic shielding type High-Tc superconducting FCL was obtained in the case of design and modeling.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2279-2280
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• 2008

When electric power systems expand and become more interconnected, the fault current levels increase in the distribution system. Therefore, we studied the influence of the power system according to application of a resistive FCL. In this paper, the distribution system and the resistive FCL were modeled by using EMTP (Electromagnetic Transients Program), which simulates the effect of the resistive FCL for the single line ground fault in distribution system.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.12
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• pp.661-669
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• 2004

As the load density of KEPCO system is higher, the fault current can be much higher than SCC(Short Circuit Capacity) of circuit breaker. Fault current exceeding the rating of circuit breaker is a very serious problem in high density load area, which can threaten the stability of whole power system. Even though there are several alternatives to reduce fault current, as the superconductivity technology has been developed, the HTS-FCL (High Temperature Superconductivity Fault Current Limiter) can be one of the attractive alternatives to solve the fault current problem. This study presents the application plication of 154kV HTS-FCL in Korean power system.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.250-252
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• 2002

Nowadays, one of the serious Problems in KEPCO system is the more higher fault current than the SCC(Short Circuit Capacity) of circuit breaker. There are many alternatives to reduce the increased fault current. As the superconductivity technology has been develops, the HTS-FCL(High Temperature Superconductor-Fault Current Limiter) can be a one of the attractive alternatives to solve the fault current problem. Under the this background, this paper presents distribution system EMTDC modeling and the application of EMTDC model for resistance type HTS-FCL in the developed distribution system model.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.48 no.3
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• pp.173-178
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• 1999

In this paper, the characteristics of the shielded inductive superconducting fault current limiter(FCL) were simulated and analyzed. After determining parameters fo design for superconducting tube, iron core and primary coil, simple power system composed of shielded inductive FCL was simulated by the numerical analysis. The currents flowing under the fault condition could be limited below 50 A successfully. It was suggested that as the important factors of operational characteristics, the turns of primary coil and size of iron core play a major role for whether the shielded inductive SCFCL operated as inductive type or resistive type FCL.

• Journal of the Korea Society for Simulation
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• v.9 no.3
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• pp.27-41
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• 2000

As the application domains of rule-based systems become larger and more complicated, the integration of rule-based systems within the database systems has become the topic of many research works. This paper suggests a simulation modeling using expert system and database. The integration methods employed in this research are as follows. First, we defined new states and state transition functions to interrelate simulation model and expert system. Second, we designed and implemented FCL(Fact Class Library) as a interface of expert system and database. FCL has facilities of filtering data from database, and assigning a meaning to the filtered data. Also, FCL detects the violation of the integrity rules in database, as the result of inference is reflected. Some implementation problems are pointed out and the methods to solve these problems are discussed in this paper, We developed a simulation model of the grating production line and executed it to validate the functions of the proposed method.

• Proceedings of the KIEE Conference
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• summer
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• pp.427-429
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• 2004

As the load density of KEOCO system is higher, the fault current can be much higher than SCC(Short Circuit Capacity) of circuit breaker. Even though there are several alternatives to reduce fault current, as the superconductivity technology has been developed, the HTS-FCL (High Temperature Superconductivity Fault Current Limiter) can be one of the attractive alternatives to solve the fault current problem. This study presents the application of HTS-FCL in real customer system.

• Progress in Superconductivity and Cryogenics
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• v.10 no.3
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• pp.19-22
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• 2008

The power systems should be improved to reduce the number of black-out events occurring throughout the world. Quantitative evaluation of composite power system reliability is very important in a competitive electricity environment. The reason is that the successful operation of electric power systems under a deregulated electricity market depends on transmission system reliability management. This paper presents sensitivity analysis of probabilistic reliability indices of Korea power systems with checking application of HTS-FCL.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2003.04a
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• pp.64-64
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• 2003

본 연구는 서양뒤영벌의 대량사육 체계를 확립하기 위한 기초조사로 적정 교미환경을 구명하기 위해 조사하였다. 서양뒤영벌의 적정 교미 광원 조사는 공시광원 IL30, FCL22D, FL20B, FL20PG를 사용하였으며, FCL22D에서 70%로 가장 높은 교미율이 얻어졌다. 적정 교미 온도 조사는 공시온도 15$^{\circ}C$, 2$0^{\circ}C$, $25^{\circ}C$, 3$0^{\circ}C$에서 시험하여 각 온도별 통계적 유의차를 확인 할 수 없었으나 $25^{\circ}C$에서 다소 높은 교미율을 보였다. (중략)

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.337-338
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• 2017

본 논문에서는 전력 반도체 스위치를 기반으로 한 새로운 구조의 단상 FCL (fault current limiter) 토폴로지를 제안하였다. 제안된 회로는 정상상태 동작 시 손실이 매우 작지만 고장이 발생했을 때 빠른 속도로 증가하는 고장 전류를 효과적으로 제한할 수 있고 기존 FCL과 비교하여 비용을 절감할 수 있는 장점이 있다. 또한 제안하는 토폴로지는 PSIM 시뮬레이션을 통해 성능 및 타당성을 검증하였다.