SPAD 346 C Stabilized Differential Relay User Manual

This document is a user manual and technical description for the SPAD 346 C stabilized differential relay, which integrates three-phase differential, overcurrent, and earth-fault protection for transformers and generators. It details the functions, settings, connections, and technical data for its constituent modules (SPCD 3D53, SPCD 2D55, SPCJ 4D28), including features like harmonic blocking, vector group matching, and disturbance recording.