• Title/Summary/Keyword: limiter

검색결과 783건 처리시간 0.038초

실계통에서의 154kV HTS-FCL Bus-Tie 최적 적용방안에 관한 연구 (A Study on the Bus-Tie Application of 154kV HTS-FCL in Korean Power System)

  • 김종율;윤재영;이승열
    • 대한전기학회논문지:전력기술부문A
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    • 제54권5호
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    • pp.226-233
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    • 2005
  • As the power demand has been increasing, a fault current problem is becoming more serious in real power system. Various ways like bus-split operation, transmission line open operation, are used in Korean power system for solving the problem. In this time, superconducting FCL(Fault Current Limiter) has been developed as a vary attractive alternative since HTS(High Temperature Superconductivity) was discovered. Korea, a project developing superconducting FCL to apply to 154kV transmission system is proceeding. Therefore, a power system analysis for SFCL application to power system is necessary, This paper presents the determination of quenching resistance and the selection of optimal cites when 154kV HTS-FCL is applied to Korean power system.

저항형 초전도 한류기에서의 퀀치 전파 (Quench propagation in resistive SFCL)

  • 김혜림;현옥배;최효상;황시돌;김상준
    • 한국전기전자재료학회논문지
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    • 제13권4호
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    • pp.337-342
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    • 2000
  • We fabricated resistive superconducting fault current limiters based on YB $a_{2}$/C $u_{3}$/ $O_{7}$ thin films and investigated their quench propagation characteristics. The YB $a_{2}$/C $u_{3}$/ $O_{7}$ films was coated with a gold layer and patterned into 1 mm wide meander lines by photolithography. The quench was concluded to start locally and propagates until completed. The quench propagation characteristics were explained based on the heat transfer within the film as well as between the film and the surrounding liquid nitrogen. The quench completion time depended strongly on potential fault current amplitude and not significantly on fault angle which indicates that the quench propagation speed is affected more by heat dissipation rate than by fault current increase rate. The quench completion time was 1 msec at the fault current of 65 $A_{peak/{\ak}}$.

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DC reactor type 고온호전도 한류기의 턴간 절연 특성 (The Dielectric Characteristics of Turn-to-Turn Insulation for DC Reactor Type HTSFCL)

  • 백승명;정종만;이창화;류엔반둥;김상현
    • 한국전기전자재료학회논문지
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    • 제16권12S호
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    • pp.1299-1304
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    • 2003
  • Fault current limiters (FCL) are extensively needed to suppress fault currents, especially for trunk power systems heavily connected to high voltage/large current transmission lines. Due to its ideal electrical behavior, high-temperature superconductor fault current limiter (HTSFCL) becomes one of the most important developing trends of limiters in power system. This paper describes the result of an investigation of the dielectric characteristics of turn-to-turn insulation for pancake and solenoid type reactor coil in liquid nitrogen. The influence of thickness in a variety length, on AC, DC and impulse surface flashover has been investigated. Also, the relationships between the number of turn and breakdown characteristics were clarified. The information gathered in this test series should be helpful in the design of liquid nitrogen filled DC reactor type HTSFCL.

Recent Development of Bulk High-Tc Superconductors

  • 유상임
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2002년도 춘계학술대회 논문집 초전도 자성체
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    • pp.88-95
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    • 2002
  • Recent development in the field of RE-Ba-Cu-O (REBCO, RE: Y or rare earth elements) bulk high-Tc superconductors (HTS) is reviewed in the present paper. After the fatal weak link problem of sintered REBCO superconductors has been overcome by melt processing, this field has been greatly advanced during last ten years. The critical current density $J_c$ at 77 K has been enhanced by introducing effective flux pinning sites into the $REBa_2Cu_3O_y$ (RE123) superconducting matrix. Large melt-textured REBCO bulk crystals have been fabricated with the TSMG(top-seeded melt growth) technique. Mechanical properties of REBCO bulks have been improved by using the Ag additive or epoxy resin. Real bulk applications such as current lead, fault current limiter, flywheel energy storage system, magnetic field source, magnetic separation system, and etc., surely come true near future.

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초전도고장전류제한기의 고장전류억제효과와 동작파라메타 설정방법에 대한고찰 (On Fault Current Limitering and Design Method of the Specific Parameter of Superconducting Fault Current Limiter)

  • 홍원표;김정훈
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 D
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    • pp.972-974
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    • 1997
  • Design & Operation of power system for meeting increase of electric Power demand is becoming more difficult and complex. One of reasons is increase of fault current. As one of the most effective methods for suppressing the fault current installation of SFCL is expected. These paper describes a method of fault analyses of power system with SFCLs, and also discusses determination of specification of SFCLs, effects of limiting the fault current due to SFCLs by use of the model system of two - bus electric power system with single transmission lines.

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낙하충격하중을 받는 방사성물질 수송용기의 동적거동에 관한 연구 (A Study on the Dynamic Behaviors of a Shipping Container Under Drop Impact Loading)

  • 이영신;김용재
    • 대한기계학회논문집
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    • 제18권11호
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    • pp.2805-2816
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    • 1994
  • This paper describes dynamic finite element analyses performed to study the dynamic behaviors of a shipping container under the impact onto rigid target due to the accidental fall from the hight of 9 m. Using two and three dimensional techniques, the shipping container which gave the maximum damage, ten different drop orientations are considered ; at intervals of $5^{\circ}$ from $45^{\circ}$ to $90^{\circ}$ According to the present results, the orientation of the shipping container which gave the maximum damage is $85^{\circ}$ from horizontal for oblique drop in the primary impact. In the optimal design of the shipping container, the impact limiter material must be considered importantly because it's proper selection affects the weight and the manufacturing cost of the shipping container. The analysis of the shipping container in this paper demonstrated that the shipping container is structurally sound relative to the regulatory drop test requirements.

선형 OTA를 이용한 사인파 동조형 전압-제어 발전기 (A sinusoidal tuned VCO using linear OTA's)

  • 박지만;정원섭
    • 전자공학회논문지B
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    • 제33B권7호
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    • pp.80-85
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    • 1996
  • A sinusoidal tuned VCO based on linear OTA's has been designed for instrumentation and measurement applications. It consists of a noniverting amplifier, a hard limiter, and a current controlable LC-tuned circuit which is realized vy two linear OTA's and two grounded capacitors. A prototype circuit has been built with discrete components. The experimental results show that the proposed VCO has a linearity error of less than 6.5 percent and a temperature coefficient of less than 200ppm/$^{\circ}C$ over a bias current range form 5$\mu$A to 100 $\mu$A(or an oscillation frequency range form 775.5 Hz to 20.371 kHz). A total harmonic distortion of 0.6 percent was measured for a peak-to-peak amplitude of 5V.

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션트리액터의 자기결합유무에 따른 초전도전류제한기의 전류제한 및 회복특성 분석 (Analysis on Current Limiting and Recovery Characteristics of a SFCL Dependent on Magnetic Coupling of Shunt Reactors)

  • 임성훈;안재민;김진석;문종필;김재철
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2008년도 추계학술대회 논문집
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    • pp.277-279
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    • 2008
  • The current limiting and recovery characteristics of a superconducting fault current limiter (SFCL) using shunt reactors were analyzed. Generally, the shunt reactor has a role to distribute the even voltage drop between high-Tc superconducting (HTSC) elements comprising the SFCL. However, the shunt reactors magnetically separated was not contributed to the equal voltage distribution between the HTSC elements. Through the experiments for the SFCL with both the magnetically coupled and magnetically uncoupled shunt reactors, the magnetically coupled shunt reactors were confirmed to improve the current limiting and recovery characteristics of the SFCL.

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직렬연결된 두 코일의 자기결합을 이용한 초전도 전류제한기의 전류제한 및 회복특성 분석 (Analysis on Current Limiting and Recovery Characteristics of a SFCL using Magnetic Coupling of Two Coils with Series Connection)

  • 임성훈;김진석;안재민;문종필;김재철
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2008년도 추계학술대회 논문집
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    • pp.281-283
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    • 2008
  • The superconducting fault current limiter (SFCL) using magnetic coupling of two coils with series connection, which was suggested by us, has the merit to increase the operational current and the limiting impedance of the SFCL through the adjustment of the inductance ratio and the winding direction of two coils. In addition, the recovery characteristics of the SFCL is affected by the winding direction of two coils as well as two coils' inductance ratio. In this paper, the fault current limiting and recovery characteristics of a SFCL using magnetic coupling of two coils with series connection were analyzed. Through the analysis based on the experimental results, the recovery characteristics and the current limiting characteristics of the SFCL were confirmed to be improved more in case of the additive polarity winding.

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