Busbar protection that stays ahead of every fault
MiCOM P74x delivers fast, secure, and scalable busbar differential protection for every substation layout — single, double, ring, or breaker-and-a-half.
Explore MoreA busbar fault hits hard. Slow protection hits harder
Legacy schemes falter with CT saturation, complex switching, missed isolator states and unstable currents. The result? Mis-trips. Blind spots. Long outages.
Meet MiCOM P74x — precision busbar protection for modern substations
MiCOM P741, P742 and P743 bring numerical biased differential protection built for multi-bus, multi-feeder environments. A central unit works with peripheral units over high-speed optical links, creating a scalable, secure protection architecture. It captures isolator states, supervises CT health, blocks saturation, and validates every trip through a dedicated check zone. With PSL logic, event recording, and SCADA-ready communications, P74x manages complex busbar schemes with confidence.
Fast. Firm. Fault-smart
Purpose-built algorithms that keep busbars stable under any condition.
High-speed differential
Phase-segregated, stable during CT saturation, secure in heavy fault conditions.
Check-zone assurance
Two-level validation avoids unwanted trips even in complex topologies.
Breaker and isolator intelligence
Live state monitoring ensures switching operations reflect true topology.
Built-in backup
Overcurrent, earth-fault and breaker-failure add layered security to every bus section.
Deep disturbance records
Waveforms, SOE and diagnostics for rapid post-fault analysis.
Scalable architecture
Central and peripheral units adapt to any bus arrangement.
Designed for secure high-current environments
Powerful logic with flexible hardware across all models.
Built for every busbar philosophy
Simple or complex, P74x fits the layout.
Confidence where the grid converges
Critical nodes demand protection that never hesitates.
Transmission utilities
Busbar protection configured right
We map your zones, CTs and isolators for precise P74x settings.
Services
Relay Testing, Programming & Configuration
Integrated solutions for complete busbar schemes
A compatible set of feeder protection, breaker failure, and substation communication products designed to operate alongside MiCOM P746, ensuring coordinated protection logic, reliable data exchange, and long-term scheme stability.
Design busbar protection that never hesitates
High-speed differential protection that stays secure during CT saturation and switching events.
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