The MiCOM P594 GPS Synchronizing Unit was originally designed to allow GPS-derived time synchronization for the P543 to P546 Current Differential Relays when used in Synchronous Digital Hierarchy (SDH)/Synchronous Optical Network (SONET) or other switched communication networks.

Hardware Suffix D of the P594 additionally provides GPS-derived synchronization of AREVA T&D’s CVCOM Merging Units for use with the IEC 61850-9-2 interface for Sampled Analogue Values, it provides also IRIG-B time synchronization outputs, both modulated and un-modulated, and finally it provides pulse output contacts.

The IRIG-B outputs will allow the P594 to provide the time synchronization source for the Px3x and the Px4x relays, Mx7x measurements devices and also other manufacturers’ substation equipments.

The P594 provides one pulse per second (1 PPS) fiber outputs for the purpose of synchronizing CVCOM Merging Units for NCIT applications.
The unit is housed in a MiCOM 20TE case (same dimensions and cutout as previous hardware versions) and can be located up to 1 km away from the relay or CVCOM.