Shortening Recovery Time with Bypass Breaker for Resistive Superconductor Fault Current Limiters

Yılmaz, Buğra; Gençoğlu, Muhsin Tunay

doi:10.1007/s13369-022-07297-0

Cited by 2 publications

(1 citation statement)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have established several practical approaches to reduce the recovery time of SFCL, including increasing the stabilizer thickness [15], arranging an extra flowing branch [16,17], and adopting partially joined porousstabilized REBCO tape [18,19]; all attempts have achieved good results.…”

Section: Introductionmentioning

confidence: 99%

Improving the recovery performance of superconducting fault current limiters using nitrogen/tetrafluoromethane mixed coolants

Zhou,

Qiu,

Jing

et al. 2024

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The superconducting fault current limiter (SFCL) improves the power grid safety by restricting the drastically increased current when the circuit fault occurs. However, the SFCL suffers from a long recovery time and can hardly recover to the superconducting state before the breaker attempts to reclose, which hinders its practical application. This paper presents the implementation of the rapid-recovery SFCL with efficient heat dissipation even if encountering a large fault current. This is enabled by thermal performance regulation of the working coolant through adding tetrafluoromethane (CF4) into the liquid nitrogen (LN2). The proposed mixed coolant features a high critical heat flux that suppresses the onset of film boiling. Controlled experiments were performed with the fabricated current-limiting coil immersed in the N2/CF4 mixed coolants containing 0, 20 and 40 mol% of CF4. Measured results regarding both quenching and recovery processes are reported, demonstrating an 85.4% reduction in recovery time for the 40 mol% composition compared to the conventionally used pure LN2. Analyses of the electrical parameters of the coil verify its effective quenching performance in the proposed immersion cooling system with an overall current limiting rate of over 55%. These findings lay a foundation for designing the rapid-recovery-type SFCL and facilitating its application in power systems.

show abstract