Busbar Protection That Stays Ahead Of Every Fault.
MiCOM P740 delivers fast, secure, and scalable protection for every substation layout — single, double, ring, or breaker-and-a-half.
A Busbar Fault Hits Hard.
Slow Protection Hits Harder.
Legacy schemes falter with CT saturation and missed isolator states. The result? Mis-trips, blind spots, and long outages across your most critical grid nodes.
Poor fault discrimination
Aging relays fail to isolate fault zones, causing whole station blackouts.
Limited disturbance insight
Zero recording depth makes root-cause analysis of bus trips impossible.
Slow trip logic
Legacy schemes exceed the critical stability window of modern HV grids.
Weak CT supervision
Failure to detect saturated or open CTs leads to catastrophic false trips.
Unstable zone control
Difficulty tracking isolator auxiliary states in double-bus layouts.
Meet MiCOM P740
— Precision busbar protection for modern substations.
P741, P742 and P743 bring numerical biased differential protection built for multi-bus environments. Central and peripheral units work over optical links to block saturation and validate every trip through a dedicated check zone.
Fast. Firm.
Fault-Smart.
Purpose-built algorithms that keep busbars stable under any topology or switching condition.
Check-zone assurance
Two-level numerical validation avoids unwanted trips even in complex topologies.
Breaker & isolator intelligence
Live state monitoring ensures switching operations reflect the true bus topology.
Built-in backup
Overcurrent, earth-fault and breaker-failure add layered security to every section.
Deep disturbance records
High-res waveforms, SOE and diagnostics for rapid forensic post-fault analysis.
Scalable architecture
Central (CU) and peripheral (PU) units adapt to any bus arrangement or size.
High-speed differential
Phase-segregated logic, stable during heavy CT saturation and grid surges.
Designed for Secure High-Current Environments
Powerful logic with flexible scalable CU-PU hardware
Where MiCOM P740 Turns Complexity Into Control
Precision differential logic for any bus arrangement from single bus to mesh stations.
Double bus stations
Dynamic topology tracking for substations with main and transfer buses.
Breaker-and-a-half
High-availability schemes for EHV/HV transmission grid nodes.
Ring bus arrangements
Selective differential logic for loop-connected substation designs.
Multi-feeder substations
Scalable architecture handling up to 28 feeders per central unit.
Single bus systems
Compact P741 deployment for straightforward industrial switchyards.
Bus coupler logic
Specialised logic for secure coupler and bus section operations.
Double bus stations
Dynamic topology tracking for substations with main and transfer buses.
Breaker-and-a-half
High-availability schemes for EHV/HV transmission grid nodes.
Ring bus arrangements
Selective differential logic for loop-connected substation designs.
Multi-feeder substations
Scalable architecture handling up to 28 feeders per central unit.
Single bus systems
Compact P741 deployment for straightforward industrial switchyards.
Bus coupler logic
Specialised logic for secure coupler and bus section operations.
Busbar Protection Configured
Right
We map your zones, CTs and isolators for precise P740 settings
Relay Testing, Programming &
Configuration
Technical Node Assessment
- Isolator auxiliary state mapping
- Check-zone logic calibration
- Sub-cycle timing verification
Confidence Where
The Grid Converges.
Critical nodes demand protection that never hesitates.
Transmission utilities
HV/MV substations
Industrial switchyards
Generation switchyards
Renewable integration hubs
Coordinated Substation Suite.
Compatible protection and control units designed to work alongside MiCOM P740.
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