Redundancy checking method and system for non-redundant AD acquisition of protective measuring and controlling device

The invention relates to a redundancy checking method and system for non-redundant AD acquisition of a protective measuring and controlling device, and belongs to the technical field of electric powersystem relay protection. By synthesizing and then comparatively validating the analog quantity collected by the protective measuring and controlling device and related channel analog quantity data, an analog quantity acquisition loop is detected, and the redundancy checking method is characterized by at least including the following steps of first, grouping of the analog quantity; second, calculation of an actual effective value; third, calculation of a synthesis sampling value; fourth, calculation of a sampling value deviation; fifth, calculation of a synthesis effective value; sixth, calculation of an effective value deviation; and seventh, abnormal judgment of the analog quantity. The redundancy checking method and system are applied to the protective measuring and controlling device without double AD redundan