AREVA Substation Automation Solutions introduces the MiCOM P64X which preserves service life, and offers fast protection for transformer faults. Hosted on an advanced IED platform, the P64X incorporates differential, REF, thermal and overfluxing protection, plus backup protection for uncleared external faults. Model variants cover two & three winding transformers (including autotransformers), with up to 5 sets of threephase CT inputs. Large CT counts are common in ring bus/mesh corner applications, where the P64X summates currents to create each total winding current, easing application of backup protection. Backup overcurrent can be directionalized, where the user includes the optional 3-phase VT input in their chosen model.