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Fault Current Limitation Characteristics of the Bi-2212 Bulk Coil for Distribution-class Superconducting Fault Current Limiters  

Sim, Jung-Wook (고려대학 신소재공학부)
Lee, Hai-Gun (고려대학 신소재공학부)
Yim, Sung-Woo (한전 전력연구원)
Kim, Hye-Rim (한전 전력연구원)
Hyun, Ok-Bae (한전 전력연구원)
Park, Kwon-Bae (LS산전 전력연구소)
Lee, Bang-Wook (LS산전 전력연구소)
Oh, Il-Sung (LS산전 전력연구소)
Kim, Ho-Min (한국전기연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.56, no.2, 2007 , pp. 277-281 More about this Journal
Abstract
We investigated fault current limitation characteristics of the resistive superconducting fault current limiter (SFCL) which consisted of a Bi-2212 bulk coil and a shunt coil. The Bi-2212 bulk coil and the shunt coil were connected in parallel. The Bi-2212 bulk coil was placed inside the shunt coil to induce field-assisted quench. The fault test was conducted at an input voltage of $200V_{rms}$ and fault current of $12kA_{rms}\;and\;25kA_{rms}$. The fault conditions were asymmetric and symmetric, and the fault period was 5 cycles. The test results show that the SFCL successfully limited the fault current of $12kA_{rms}\;and\;25kA_{rms}$ to below $5.5{\sim}6.9kA_{peak}\;within\;0.64{\sim}2.17$ msec after the fault occurred. Limitation was faster under symmetric fault test condition due to the larger change rate of current. We concluded that the speed of fault current limitation was determined by the speed of current rise rather than the amplitude of a short circuit current. These results show that the Bi-2212 bulk coil is suitable for distribution-class SFCLS.
Keywords
superconducting fault current limiter; SFCL; Bi-2212 bulk coil; field-assisted quench; distribution-class;
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