Alstom P54331AH7M0610M Differential Protection Relay

Alstom Micom P54331AH7M0610M is a MiCOM P54x current differential protection relay designed for fast, selective differential protection of transformers and feeder lines within substation switchgear. Model P54331AH7M0610M provides phase differential protection (87P) and neutral differential protection (87N) with a phase-segregated configuration option to improve stability under external disturbances. The relay supports subcycle differential current protection and CT supervision to ensure accurate measurements even as CT ratios or connections vary. It offers flexible breaker configurations and InterMiCOM64 inter-relay communications for coordinated protection across multiple devices, and it includes IEC 61850 compatibility for modern substation automation alongside conventional interfaces. Time synchronization options include IRIG-B to align protection actions with network timing. In addition to differential protection, the P543 family commonly integrates related protection functions and logic blocks enabling protection of transformers, bus sections, and feeders within medium- and high-voltage installations. The unit is designed for compact installation in switchgear with multiple CT connections and CTS supervision to ensure reliable differential operation in real-world conditions. Part of the Alstom/Schneider Electric lineage later rebranded under GE Vernova Grid Solutions, this model benefits from ongoing support within the MiCOM Agile protection family and the familiar MiCOM configuration workflow.