Patent ID: 7974064

Claim:
A protective relay for protecting electrical equipment in a power distribution system, comprising: an input module configured to receive a signal indicative of a condition of a medium voltage power line; a processing module configured to digitally process the signal received by the input module; an output module configured to supply energy to an actuator of a circuit breaker; a detachable Human Machine Interface (HMI) having input components configured to receive, from a user, input of a setting of an operating parameter of the protective relay; an interface configured to exchange data between the processing module and the detachable HMI; and a base HMI having mechanical switches configured to receive, from a user, input of a coarse setting of the operating parameter of the protective relay, wherein the processing module is configured to receive a fine setting, with a higher resolution than the coarse setting, of the operating parameter from the detachable HMI.