IMPROVEMENTS IN AND RELATING TO ELECTRICAL PROTECTIVE RELAYS

摘要

An electrical protective relay having a disc-shaped rotor biased to a non-operated position by two restoring spiral; springs, an electrical winding on one of the surfaces of said rotor for energization by a relay input current, a pair of contacts or detect the operated position, and magnetic stator with poles so positioned that its irmn magnetic flux and the current in the said winding interact to produce an electro-dynamic torque for turning the said rotor against the action of said springs when the current in the said winding is sufficiently strong, said rotor being mounted on a spindle to turn between the poles of said stator, said winding being so distributed on the surface of said rotors that the radical currem-carrying conductors in it come under the influence of the poles as said rotor is turned from the n on- operated position to the operated position, and the ends of said winding being connected by means of two insulated leads running along said spindle to the inner ends, insulated from said spindle, of said springs with their outer ends connected to the external circuit terminals.