Section 1 Relays and Power Transformers for Relay Protection nRelays are the basic components of relay protection devices. Current relays are the basic components for implementing current protection. They are used as measuring and starting components in current protection. They are relays that react when the current exceeds a certain set value. nThe relay characteristics of electromagnetic relays are realized through torque interaction. The minimum current that can cause the relay to operate (close the moving contact) is called the operating current of the relay; the maximum current that can cause the relay to return (open the moving contact) is called the return current of the relay. Due to the existence of friction torque, the return current is not equal to the operating current.
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