Patent ID: 7558030
Filing Date: 2009-07-07
Classification: H02H,Y02E,Y10S

Abstract:
1. A resistive superconducting fault current limiter, comprising: a superconducting limiter element which is in a superconductive state when a normal current flows through the superconducting limiter element, and which changes to a normal conductive state in which the superconducting limiter element has a resistance, when a fault current larger than a predetermined threshold current value flows through the superconducting limiter element; a superconducting serial coil serially connected to the superconducting limiter element, through which a current flows in a direction opposite to the current flowing through the superconducting limiter element, whereby magnetic fields generated by the currents flowing in the superconducting limiter element and the superconducting serial coil cancel each other, the superconducting serial coil having a threshold current value greater than the threshold current value of the superconducting limiter element; and a normal conductor parallel coil connected to the superconducting limiter element in parallel and having a resistance smaller than the resistance of the superconducting limiter element when a fault current occurs, wherein current flowing to the superconducting limiter element is reduced by current flowing through the normal conductor parallel coil, thereby preventing the superconducting limiter element from being overheated, and the normal conductor parallel coil uniformly quenches the superconducting limiter element by generating a magnetic field, when a fault current occurs, and the superconducting limiter element, the superconducting serial coil, and the normal conductor parallel coil are formed as concentric cylinders.