Ref.: MmeMeim05-001

Analyze of a superconducting fault current limiter based on SmBaCuO polycrystalline ceramic

Apresentador: Edmilson Bermudes Rocha Junior

Autores (Instituição): Rocha Junior, E.B.(Instituto Federal do Espírito Santo); Passos, C.A.(Universidade Federal do Espírito Santo); Nascimento, J.O.(Universidade Federal do Oeste do Pará); Passamai Junior, J.L.(Universidade Federal do Espírito Santo); Orlando, M.T.(Universidade Federal do Espírito Santo);

Resumo:
The growing presence of distributed generation (DG) in energy systems has contributed to improving the voltage profile, energy quality and system stability. However, this causes negative impacts on the classic protection system, especially in the task of limiting the short-circuit current. Thus, one of the most efficient methods to mitigate the side effects of connecting DG to the distribution system is the use of a fault current limiter. This work describes the performance of a superconducting resistive fault current limiter (SFCL) based on the polycrystalline material SmBa2Cu3O7 -d (Sm-123). The Sm-123 element was connected in series with the electrical circuit and subjected to 1000 short events -circuit with an actuation time of 80 ms, for a single maximum value of fault current (14 Amax). Furthermore, the tests were conducted under temperature cycling of the SFCL element. The results obtained indicate that Sm-123 polycrystalline cuprates can be used to construct superconducting fault current limiters. After 1000 repetitions of short circuit and thermal cycles, the superconducting element was able to limit the fault current without degradation at low fault current density J < 28 A/cm2.