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Operational Characteristics of Flux-lock Type SFCL using Series Resonance
Sung-Hun Lim,한병성,Hyo-Sang Choi 한국전기전자재료학회 2005 Transactions on Electrical and Electronic Material Vol.6 No.4
We analyzed the fault current limiting characteristics of a flux-lock type high-TC super-conducting fault current limiter (HTSC-FCL) using series resonance between capacitor for series resonance and magnetic field coil which was installed in coil 3. The capacitor for the series resonance in the flux-lock type HTSC-FCL was inserted in series with the magnetic field coil to apply enough magnetic field into HTSC element, which resulted in higher resistance of HTSC element. However, the impedance of the flux lock type HTSC-FCL has started to decrease since the current of coil 3 exceeded one of coil 2 after a fault accident. The decrease in the impedance of the FCL causes the line current to increase and, if continues, the capacitor for the series resonance to be destructed. To avoid this operation, the flux-lock type HTSC-FCL requires an additional device such as fault current interrupter or control circuit for magnetic field. From the experimental results, we investigated the parameter range where the operation as mentioned above for the designed flux-lock type HTSC-FCL using series resonance occurred.
자속구속형 고온초전도 사고전류 제한기의 히스테리시스 특성 분석
임성훈(Sung-Hun Lim),한병성(Byoung-Sung Han),박형민(Hyoung-Min Park),조용선(Yong-Sun Cho),한태희(Tae-Hee Han),두호익(Ho-Ik Do),최효상(Hyo-Sang Choi) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
The hysteresis characteristics of flux-lock reactor, which is an essential component of flux-lock type superconducting fault current limiter (SFCL), was investigated. The hysteresis loss of iron core in flux-lock type SFCL does not happen due to its winding"s structure especially in the normal state. From the equivalent circuit for the flux-lock type SFCL and the fault current limiting experiments, the hysteresis curves could be drawn. Through the hysteresis curves together with the fault current level due to the inductance ratio for the 1st and 2nd windings, the increase of the number of turns in the 2nd winding of the flux-lock type SFCL had a role to prevent the iron core from saturation.
삼상 분리 및 일체화된 자속구속형 초전도 사고전류제한기의 동작특성
임성훈(Sung-Hun Lim),조용선(Yong-Sun Cho),박형민(Hyoung-Min Park),박충렬(Chung-Ryul Park),한태희(Tae-Hee Han),두호익(Ho-Ik Do),송재주(Jae-Joo Song),최효상(Hyo-Sang Choi),한병성(Byoung-Sung Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
하나의 철심을 매개로 각 상의 1, 2차 권선이 동일한 권선비로 결선된 삼상 일체화된 자속구속형 초전도 사고전류제한기의 동작특성을 모델링하였다. 삼상 일체화된 자속구속형 사고전류제한기는 평상시에 각 상의 두 코일에서 유기되는 자속이 서로 상쇄되어 철심내부의 자속은 발생하지 않게 된지만 임의의 한 상에서 단락사고가 발생할 경우 삼상이 분리된 사고전류제한기와 달리 사고상 뿐 아니라 건전상에 연결된 초전도소자도 ?지가 발생하는 특징이 있다. 등가회로를 이용한 모델링을 통해 삼상이 분리된 경우와 삼상이 일체화된 경우의 동작특성을 비교분석하였다.