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Line Protection

Home > Grid Automation > Protection Relays > Line Protection > P54 MiCOM 5th Generation

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  Interactive Selector Guide - Line Differential
  Interactive Selector Guide - Line Distance
  Spotlight Application
  Typical Applications
  Transmission Principles & Protection
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  Legacy Transmission Protection

P54 MiCOM 5th Generation
Line Differential and Distance Protection

The P54, part of the MiCOM P40 Agile 5th Generation family, is a line differential and distance Protection that delivers high performance processing and a graphical HMI as standard. A cost-effective range of transmission/sub-transmission class protection relays providing comprehensive line differential protection for up-to 3 line ends, with in-built subcycle transmission class distance and directional earth fault protection. This range of products is ideal for HV, EHV and UHV applications on lines and cables for 1 or 2 breaker applications with patented adaptive auto-reclose functionality.

Key features:

  • Integrated full colour display, for single-line diagram control of the protected bay.
  • Current transformer supervision operates with or without voltage inputs, to prevent any spurious tripping and raise the alarm
  • True subcycle distance protection with up to 9 fully directional distance zones for transmission class security and dependability 
  • Load blinder prevents spurious trips cascading through the network in extreme conditions such as on the verge of a blackout
  • Distance phase preference tripping logic and transient earth fault detection (TEFD) for Petersen coil earthed and isolated systems
  • Unparalleled speed, security and selectivity 
  • With fast start up time of less than 10s, resulting in protection, control and communications without the need to wait
  • Full compatibility of the Line Differential communications with all legacy MiCOM P540
  • Compatible with 56/64kbps or 2Mbps for direct fiber or MUX communications channels
  • Suitable for use with equal or unequal transmit and receive path delays (eg SDH/SONET)
  • Suitable for MPLS differential channels
  • Full suite of monitoring, control and recording capabilities plus fault locator.
  • Multi-shot autoreclosure with check synchronism - adaptive technology to detect fault arc extinction and accelerate the dead time or drive to lockout for persistent faults
  • Harsh environment coating as standard for all GE’s MiCOM P40 relays protects against corrosive gases such as H2S or SO2
  • No internal batteries in GE-branded models – removes a maintenance item and eases air-freight logistics
  • CyberSentryTM  Advanced Security including AAA, Radius, RBAC, and Syslog
  • IEC 61850 9-2LE Process Bus capability with PRP in all models
  • Secure Data vault with 5000 events, 100 Fault records and over 1000s of Oscillography
  • Binary inputs ESI48-4 EB2 compliant
What's New

What's New

MiCOM P40 Agile Explorer


The P54 MiCOM 5th Generation range of transmission-class protection relays provide high speed current differential unit protection. They are designed for overhead line and cable applications, interfacing readily with the longitudinal (end-end) communications channel between line terminals. The interface options support direct fiber optic or multiplexed digital links.
Each of the models offer resident subcycle distance protection to complement the powerful suite of main and backup protection. Full scheme, nine-zone distance protection is adopted from the class-leading MiCOMho P44. The product line becomes the standard in all HV, EHV and UHV line protection applications, duplicated where dual redundant main protection is demanded. Set any combination of differential, distance, overcurrent and reclosing, depending on the site needs. One universal relay type instead of two or more discrete models means reduced spares holding, less training, and lower cost.
The MiCOM Agile P54 is also suitable for the complex installation and feeders controlled by two circuit breakers such as breaker-and-a-half configurations with dual breaker autoreclose logic schemes with synchrocheck for both breakers.

Key benefits:

  • A universal relay that reduces spare holding - apply as a current differential relay, a distance relay, or both
  • Neutral differential boosts sensitivity of tripping for resistive earth faults, even for lines with heavy load-flow 
  • Transient biasing reduces CT knee point dimensioning by typically 25% compared to historical applications 
  • Differential protection adaptable to all different substation topologies: in-zone transformers and unequal line end CT ratios 
  • Multi-shot 1/3pole & 3pole autoreclosure with check synchronism - adaptive technology to detect fault arc extinction and accelerate the dead time or drive to lockout for persistent faults.  Improves system stability whilst reducing OPEX.

Main characteristics:

  • Comprehensive communication options including IEC 61850 Edition 2
  • IEC 61850 redundant Ethernet protocols - RSTP, PRP or HSR
  • IEC 61850 9-2LE redundant PRP Process bus protocol
  • Fast subcycle distance protection with quadrilateral or mho zones and setting free power swing detection
  • InterMiCOM64 for transmitting digital signals (24/32) through teleprotection communication links
  • CyberSentryTM Advanced Security including AAA, Radius, RBAC, and Syslog

Functional Block Diagram

Functional block diagram

ANSI ® Device Numbers and Functions

Device Number Function
25 Check Synchronising
27 Phase and Line Undervoltage
32 Directional Power Protection
37 Undercurrent
46 Negative Sequence Overcurrent
49 Thermal Overload
50 Phase Definitive Time Overcurrent
51 Phase Inverse-Time Overcurrent
52 Circuit Breaker Control
59 Phase and Line Overvoltage
67 Directional Phase Overcurrent
68 Power Swing Blocking
78 Out-of-Step Tripping
78DC Delta (Incremental) Protection
79 Autoreclose
Device Number Function
85 Teleprotection Channel Schemes
86 Latching/Lockout Contacts
87L Line Differential -2 or 3 Ends
87N Neutral Differential
87T In-Zone Transformer Differential
21BL Load Encroachment/Blinder
21FL Fault Locator
21G Ground Distance
21P Phase Distance
46BC Broken Conductor
50/27 Switch-on to Fault
50BF CB Failure
50N Earht Fault Definite Time Overcurrent
50ST Stub Bus Protection
51N Neutral/Ground IDMT Overcurrent
Device Number Function
51N Neutral/Ground IDMT Overcurrent
59N Neutral Voltage Displacement
59R Remote End Overvoltage
64N Restricted Earth Fault
67N Directional Neutral/Ground Overcurrent
81df/dt Rate of Change of Frequency
81O Overfrequency
81U Underfrequency
CTS CT Supervision
PSL Programmable Logic
SEF Sensitive Earth Fault
TCS Trip Circuit Supervision
VTS VT Supervision

P54 MiCOM 5th Generation

P54 Line-Differential with Distance IED

Buy Now

MiCOM S1 Agile

Key benefits:

Engineering Tool Suite

S1 Agile is the truly universal PC tool for MiCOM Agile relay, assemble all tools in a palette for simple entry, with intuitive navigation via fewer mouse-clicks. No-longer are separate tools required for redundant Ethernet configuration, phasor measurement unit commissioning, busbar scheme operational dashboards, programmable curve profiles or automatic disturbance record extraction – applications are embedded. MiCOM S1 Agile supports all existing MiCOM, K-Series and Modulex, including a utility for automatic conversion of setting files from previous generations of numerical relays like K-series and MiCOM P20 to the latest P40 Agile models.

To move to the future, with no loss of functionality, no loss of device support, and full compatibility with your installed base and system architecture – request a copy of S1 Agile with the contact form link below.

MiCOM S1 Agile software

Key features in the MiCOM S1 family:

MiCOM S1 Agile software request

To receive the MiCOM S1 Agile, please use our Contact form. This will also ensure that you are kept up-to-date with the latest enhancements, including updates and bug fixes.

Refurbishment Solutions - "If it's Blue Think to Renew"

GE’s latest P54 MiCOM 5th Generation models offer an ideal path to refurbish an older installed base of MiCOM P540 relays. Whether those older products were initially sold as Alstom or AREVA-branded products, newer models retain pin-pin refurbishment capability. Advantageously, users can benefit from the advancements made in protection, control, communications, hardware and cybersecurity that have taken place in the intervening years. The new P40 retains form, fit and function compatibility but delivers the latest platform and software ready for today’s environment, and for future-proofed application for the decades ahead.

LFCB and MITZ Replacement:

MiCOM P541/2/3/4/5/6 Relay Replacement:

Pin-Pin Upgrade Methodology: