Rapid turn-off circuit in static transfer switch

A static transfer switch comprising:

• a thyristor switch;
• and
• a hybrid resonant capacitor circuit connected in parallel to the thyristor switch, the hybrid resonant capacitor circuit comprising:
• a first capacitor configured to discharge resonant current to interrupt a load current to the thyristor switch;
• a second capacitor coupled in parallel with the first capacitor, wherein the second capacitor is configured to transfer energy stored in the second capacitor to the first capacitor after discharge of the resonant current from the first capacitor;
• and
• a current limiter coupled in series with the second capacitor.

A method for facilitating multiple consecutive voltage source transfers between a first voltage source and a second voltage source powering a load, the method comprising:

• coupling a main thyristor switch between the load and the first and second voltage sources;
• coupling a hybrid resonant capacitor circuit in parallel with the main thyristor switch, the hybrid resonant capacitor circuit including a first capacitor, a second capacitor coupled in parallel with the first capacitor, and a current limiter coupled in series with the second capacitor;
• discharging, by the first capacitor, resonant current to interrupt a load current through the main thyristor switch;
• and
• transferring energy stored in the second capacitor to the first capacitor after the discharging.