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
Banner image
Protection Relays
Bus Protection

Home > Grid Automation > Protection Relays > Bus Protection > MCAG

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

High Impedance Bus Differential Relay

MCAG relays provide high-speed differential protection for various types of power system plants Including generators, reactors, busbars, motors and the individual windings of power transformers. The relays provide current-calibrated busbar differential and have an attracted armature design with simple and robust construction.

Key features:

  • High thermal withstand - improved when used with the stabilising resistor
  • Long service history, over 43,000 delivered since 1984
  • Design pedigree coming from over a million auxiliary relays in-service

Key benefits:

  • High stability during through faults  Operation is fast and reliable (25ms at 5 x setting)
  • Easy integration into 4U height MIDOS rack schemes
  • Highly-tuned to the fundamental to prevent spurious operation

Main characteristics:

  • 3 element relay supplied in a 30TE (size 6 inch) case
  • Supplied with a stabilising resistor
  • Optional Metrosil available to limit CT saturation voltage
  • Use with MVTP where scheme buswire supervision is required