Speaker
Description
Electromagnetic forces arose from short-circuit impact can cause severe injuries to transformer windings. To alleviate short-circuit force damages, this study proposes a three-phase resistive-type HTS fault current limiter (R-SFCL) design implemented in a power transformer. A field-circuit coupled model is established considering R-SFCL with three-phase non-inductive coils by coupled H-formulation model. The simulation model is validated by experimental results to be effective to predict the strains of the windings under different current load. The simulation results indicate that the fault current within transformer winding was reduced by 60% due to the three-phase R-SFCL, resulting that the transformer winding exhibits no failure in more than 20 times of 30 ms three-phase short-circuit impacts. During each current limit period, the temperature rise within HTS coils exhibits no more than 230 ℃ with energy absorption more than 100 J.
