ALSTOM MiCOM P546 P54691NH7M0760M Line Current Differential Protection Relay

Product Description

The P54691NH7M0760M is an Alstom MiCOM P546 series numerical line differential protection relay, now branded as Schneider Easergy MiCOM. It is designed for overhead line and cable differential protection for medium and high voltage power grids. It uses current differential principle with communication channel for end-to-end fault comparison, providing fast main protection for transmission and distribution feeders. This specific ordering code P54691NH7M0760M defines hardware I/O, communication interface, power supply and firmware configuration variant. It integrates backup protection, fault recording, disturbance recorder and programmable logic functions.

Features

• Model: MiCOM P546, Order Code: P54691NH7M0760M, Alstom legacy protection relay
• Core function: Current differential protection for HV/MV transmission lines and cables
• Supports dual communication channels: fiber optic, G.703, X.21 for differential signal exchange
• Built-in backup protection: overcurrent, earth fault, distance protection, frequency protection
• Disturbance recorder, fault event recording, fault location function
• Programmable scheme logic, configurable digital inputs and relay outputs
• Communication protocols: IEC 60870-5-103, Modbus, DNP3, IEC 61850 optional
• LCD local HMI, front panel LED status indicators for alarm, trip, channel fault
• Wide range power supply, robust EMC design for substation environment
• CE, IEC, KEMA certified for power system protection

Applications

• High voltage overhead transmission line main differential protection
• Medium voltage underground cable feeder protection in industrial plants
• Power plant outgoing feeder, substation interconnection line protection
• Oil & gas, chemical, mining internal power grid protection system
• Legacy Alstom MiCOM P546 relay spare replacement and substation retrofit

FAQ

Q: What is the difference between P546 and P543 / P544 / P545?
A: P546 is high-performance line differential; P543/P544/P545 are other variants with different channel and backup protection combinations.

Q: Who owns MiCOM P546 now?
A: Alstom grid protection business was acquired by Schneider, renamed Easergy MiCOM series.

Q: Is P54691NH7M0760M still in production?
A: This legacy Alstom variant is end-of-life, supplied as surplus, refurbished tested spare parts.

Q: Does line differential require two relays at both line ends?
A: Yes, one P546 relay installed at each terminal, connected by communication channel to compare current values.