Differential protection of high-voltage motor

High voltage motor differential protection device for generator at both ends of the flow in the same direction, equivalent to the size of the current through current and opposite current said non traversing currents. As the main protection and generator ratio restraint differential protection is in a non crossing current as of the action, to traverse the current as the amount of braking, to distinguish the protected elements of normal state and fault state and non normal running state. The normal operation of the state, is the current through the load current, non current theory of zero crossing.The internal phase short-circuit state, not through the current surge. When external fault occurs,through the current surge. In the three states, to protect the sensitive reaction of the internal phase short-circuit state action export, so as to achieve the purpose of element protection, and in normal operation and fault reliable action.