Explore GE Vernova
Resource Library
Get access to curated content, tools, and useful resources to help you face all your grid challenges.
Access the library
Electrification Businesses
Electrification Software
Power Conversion
Solar & Storage Solutions
Category banner
Protection Relays
Bus Protection

Home > Grid Automation > Protection Relays > Bus Protection > P746

Product Lookup
Protection & Control Online Store (new window)
Protection & Control Support
Event Calendar
Protection & Control Press Room
Related Links
  Interactive Selector Guide
  Typical Applications
  Bus Principles & Protection
  Industrial Energy Management Systems
  Legacy Bus Protection

MiCOM Agile P746
Centralized Busbar Differential Relay

The MiCOM Agile P746 provides complete protection for MV and HV busbar configurations with up to 2 zones plus a check zone, and up to 18 terminals. The MiCOM Agile P746 provides a centralized one box or three box architecture and is very simple to use. as it does not need to be deeply engineered and supports easy operation and maintenance of busbars.

The MiCOM Agile P746 protects busbar configurations at voltage levels up to extra-high voltage. Proven techniques and dynamic topology processing algorithms offer a combination of security, speed and sensitivity, with simple configuration for centralized architectures.

Key benefits:

  • Tripping time is independent of substation topology and number of terminals
  • User-friendly software tools for scheme monitoring
  • Built-in CT saturation proof breaker failure protection
  • Compatible with both conventional and NCITs
  • No internal batteries in GE-branded models – removes a maintenance item and eases air-freight logistics
  • Advanced binary inputs comply with the harshest norms for surge withstand, plus the ESI 48-4 EB2 standard. Spurious wiring pickup is eliminated without the use of interposing relays, external resistors or time delays. Battery/wiring faults, switching noise, and induction from long parallel circuits are tolerated without mis-operation
  • Harsh environment protection extends the life of the product
What's New

What's New

MiCOM P40 Agile Explorer


  • Typical operating time of 12 ms with high speed/high break contacts or 17 ms with standard contacts 
  • Phase segregated biased current differential high speed busbar protection 
  • Easy maintenance, operation and future expansion of the busbar supported
  • Deploy in ring-bus/mesh corners, single busbars, sectionalized busbars, and one per bus in breaker and a half topologies

Key benefits:

  • Use one box for schemes up to 6 feeders, and 3 boxes (one per phase) for larger schemes up to 18 terminals 
  • Interoperable with all classes of CT: IEEE, IEC, air-gapped, non-gapped, and CTs with moderate knee point voltage
  • 10 integrated function keys, tri-color LEDs, and graphical programmable logic permit the creation of comprehensive schemes, tailored to your needs 
  • IEC 61850 redundant Ethernet with RSTP and IEC 62439 PRP and HSR – with HSR support for up to 50 nodes in a ring

Functionnal Block Diagram

Busbar protection functional block diagram

ANSI© Device Numbers and Functions

Device Number Function
87BB Bus Differential
50 Phase Definite Time Overcurrent
51 Phase Inverse-Time Overcurrent
86 Latching/Lockout Contacts
50BF CB Failure
50N Earth Fault Definite Time Overcurrent
50ST Short Zone Earth Fault
51N Neutral/Ground IDMT Overcurrent
VTS VT Supervision
CTS CT Supervision
PSL Programmable Logic

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.

P746 Remote HMI PC Application Software

Agile P746 remote PC HMI provides the following features:

Please use our contact form to request the software.

Refurbishment Solutions

Refurbishment Solutions – “If It’s Blue Think to Renew”

GE’s latest MiCOM P746 model offers an ideal path to refurbish an older installed base of MiCOM P746 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.

Pin-Pin Upgrade Methodology:

Contact us for advice and support