The MiCOM P54A/B/C/E range is designed for overhead line and cable applications up to 6 terminals, interfacing readily with the longitudinal (end-to-end) communications channel between line terminals. Previously, transmission and distribution circuits would have two or three ends only, whereas five or more ends are becoming common to connect renewable generation. All models are ready for protection topologies ranging from two to six terminals, whether those multi-terminals exist now, or are provisioned for connection in the future.

Multi-ended current differential protection uses a high-speed and innovative biased differential characteristic. Phase-segregated differential elements provide consistent detection of solid and resistive faults.

Key features:

• Current differential protection for up to 6 line or cable ends, maximising connection of renewable generation, reducing greenhouse gas emissions
• Subcycle tripping time up to 4-ended topology (<1.25 cycle for 5 or 6 ends)
• Highly selective and sensitive unit protection, with capacitive current compensation for long lines or cables
• Ability to locally take any end off-line for maintenance
• Full support of SONET/SDH channel switching
• Suitable for direct fibre and multiplexed (IEEE C37.94) networks, including MPLS systems
• Full suite of monitoring, control and recording capabilities plus fault locator, autoreclose and check synchronism
• 8 teleprotection logic bits from and to each end via MODEM, fibre, or MUX channel
• Compatibility with modern Ethernet communications equipment
• New CT saturation technique reduces CT dimensioning requirements and saves on scheme cost
• Advanced IEC61850 Edition 2 implementation with complete settings via SCL files
• Redundant communications with zero downtime using optional PRP/HSR protocols
• Wide range of supported protocols Courier/K-Bus, IEC 60870-5-103, DNP 3.0 (EAI-485 or Ethernet) and IEC 61850 Edition 2
• Harsh environment coating as standard to all MiCOM relays to protect against corrosive gases such as H2S or SO2

Application:

Adapted to suit many different substation and protected feeder topologies:

• Current differential protection for up to 6 line or cable ends, maximising connection of renewable generation, reducing greenhouse gas emissions
• Highly selective and sensitive unit protection, with capacitive current compensation for long lines or cables
• Ability to locally take any end off-line for maintenance
• Transmission and subtransmission:  P54C and P54E use the same hardware as well-proven MiCOM Agile P543 and P545 models, offering scalability for large numbers of binary inputs/outputs
• Distribution: P54A and P54B offer compact feeder differential in a 40TE half-rack case