A single trigger/shunt coil is utilized for combined induced magnetic field triggering and shunt impedance. The single coil connected in parallel with the high temperature superconducting element, is designed to generate a circulating current in the parallel circuit during normal operation to aid triggering the high temperature superconducting element to quench in the event of a fault. The circulating current is generated by an induced voltage in the coil, when the system current flows through the high temperature superconducting element.
The U.S. government has a paid-up license in this invention and the right in limited circumstances to require to the patent owner to license others on reasonable terms as provided for in the terms of Contract No. DE-FC36-03GO13033 awarded by the Department of Energy.