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- Fault current limiter using transformer and modular device of YBCO coated conductor
- Universidade de São Paulo (USP)
- Universidade Estadual Paulista (UNESP)
- Ghent University
- Universidade Estadual de Campinas (UNICAMP)
- In this work, we report on the evaluation of a superconducting fault current limiter (SFCL). It is consisted of a modular superconducting device combined with a short-circuited transformer with a primary copper winding connected in series to the power line and the secondary side short-circuited by the superconducting device. The basic idea is adding a magnetic component to contribute to the current limitation by the impedance reflected to the line after transition of the superconducting device. The evaluation tests were performed with a prospective current up to 2 kA, with the short-circuited transformer of 2.5 kVA, 220 V/660 V connected to a test facility of 100 kVA power capacity. The resistive SFCL using a modular superconducting device was tested without degradation for a prospective fault current of 1.8 kA, achieving the limiting factor 2.78; the voltage achieved 282 V corresponding to an electric field of 11 V/m. The test performed with the combined SFCL (xsuperconducting device + transformer) using series and toroidal transformers showed current limiting factor of 3.1 and 2 times, respectively. The test results of the combined SFCL with short-circuited transformer showed undesirable influence of the transformer impedance, resulting in reduction of the fault current level. © 2002-2011 IEEE.
- IEEE Transactions on Applied Superconductivity, v. 23, n. 3, 2013.
- Current limiting ratio
- step up transformer
- superconducting fault current limiter
- YBCO coated conductor
- Current limitation
- Current limiting
- Magnetic components
- Step up transformers
- Superconducting faultcurrent limiters (SFCL)
- Toroidal transformers
- Transformer impedances
- YBCO coated conductors
- Critical current density (superconductivity)
- Electric fault currents
- Electric fields
- Electric transformer testing
- Superconducting devices
- Superconducting electric lines
- Yttrium barium copper oxides
- Superconducting fault current limiters
- Acesso restrito
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