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Protection & Control
Bus Protection



B95Plus Bus Protection
  • Comprehensive and scaleable bus and breaker fail protection for LV, HV and EHV busbars.
  • Features integrated protection and breaker failure for re-configurable LV, HV, EHV multi-section busbars up to 24 feeders.
B90 Bus Differential System
  • Cost effective bus protection and metering for up to six feeders.
  • Featuring integrated protection for HV and EHV busbars, providing cost effective, feature focused busbar protection.
  • Large color graphical HMI and high density I/O option available.
B30 Bus Differential System
  • Three-phase high impedance differential protection for substation busbars.
  • A high impedance busbar protection relay, designed to provide busbar differential protection for single or split busbar arrangements.
  • Large color graphical HMI and high density I/O option available.
HID High Impedance Differential Module
  • Auxiliary resistors and varistors for high impedance differential schemes.
  • Provides resistors together with voltage limiters (MOVs) normally used in conjunction with a high-speed overcurrent relay to achieve high impedance differential protection.
MFAC: High – Speed Differential Protection Relay
  • MFAC 14 when only earth fault protection is required, MFAC 34 provides both phase and earth fault protection.
  • Applications including generators, reactors, busbars, motors and the individual windings of power transformers.
  • Ensuring high stability with through faults, with 'tuned to rated frequency' technique and a wide settings range
  • Fast and reliable due to its simple electromechanical construction
MCAG High - Speed Differential Protection
  • Current-calibrated busbar differential relay highly-tuned to the fundamental to prevent spurious operation
  • Attracted armature design with simple and robust construction High impedance protection principle
  • High stability during through faults, Operation is fast and reliable (25ms at 5 x setting)
P741 - Busbar Differential Relay (Central Unit)
  • Busbar scheme for centralized or distributed applications up to 8 zones + Check Zone and 28 bays.
  • Adaptable to any busbar configuration.
  • True sample based sub-cycle operation.
  • Fully redundant communications between CU and PU’s.
  • IEC 61850-9-2 LE process bus (with P743).
P742 - Busbar Differential Relay (Peripheral Unit)
  • Peripheral Unit used with P741.
  • 40TE case with standard IO.
  • Backup protection functions (50 N&P/51 N&P/50ST P&N).
P743 - Busbar Differential Relay (Extended Peripheral Unit)
  • Peripheral Unit used with P741.
  • IEC 61850 Ed.1 communication.
  • IEC 61850-9-2 LE process bus ready.
  • 60TE case with increased IO.
  • Backup protection functions (50 N&P/51 N&P/50ST P&N).
P746 – Busbar Differential Relay
  • Complete protection for MV and HV Busbar configurations with up to 2 zones and 18 feeders
  • Option of conventional VT or IEC 61850-9-2LE compliant sampled value Process Bus
  • 10 integrated function keys, tri-color LEDs, and graphical programmable logic permit the creation of comprehensive schemes.
  • IEC 61850 redundant Ethernet, supporting self-healing ring, RSTP, dual homing or PRP/HSR
  • IEC62439 HSR compliant IEC61850 Ed 1
P747 – Busbar Differential Relay
  • Complete protection for MV and HV Busbar configurations with up to 4 zones and 18 feeders
  • 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, supporting self-healing ring, RSTP, dual homing or PRP/HSR
  • IEC62439 HSR compliant IEC61850 Ed 1