GE B90 | Low Impedance Bus Differential System

GE B90 | Low Impedance Bus Differential System

GE B90 | Low Impedance Bus Differential System
Secure, dependable and scalable bus differential protection system for LV, HV and EHV busbars. The B90, a member of the UR Family, features integrated protection and breaker failure for re-configurable MV, HV, EHV multi-section busbars with up to 24 feeders. Use one or more B90s together to build a flexible protection system that can be engineered to meet specific application requirements. The B90 performs fast and secure low-impedance bus protection with a sub-cycle tripping time of 0.75 cycles and 04 differential zones per phase.


  • Single bus, breaker-and-half busbar configurations, double Bus and triple Bus with and without bus couplers
  • Re-configurable multi-section busbar with up to 24 feeders

Key Benefits

  • High-speed protection algorithm for enhanced stability with trip times of 0.75 power cycle
  • Superior CT saturation detector that operates with only 2 msec of saturation-free current for enhanced through-fault stability
  • Ambient temperature monitoring with alarms when temperature exceeds upper thresholds
  • Suitable for different bus configurations, scalable architecture to protect up to 24 feeders
  • Advanced IEC61850 Ed. 2 implementation and complete settings via SCL files enable resource and platform managing optimization and reduce cost of ownership
  • Pre-engineered bus protection system
  • Use high-speed communications to reduce wiring and installation costs
  • Robust network security enabling Critical Infrastructure Protection through user command logging, and dual permission access control
  • Integrated isolator position monitoring & alarming
  • Supports English, French, Russian, Chinese, Turkish and German languages on the front panel, software and manuals

Functional Block Diagram

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