Railway Protection Reinvented.
Fast differential logic. Smarter bay control. Rock-solid reliability for traction transformers every mile of the route.
When protection drifts,
traction pays the price.
Aging relays miss CT asymmetries and trip on inrush nuisance. Unstable logic leads to false trips and missed internal faults across the route.
Misses real faults
Aging relays misread CT asymmetries, failing to trip during actual internal faults.
Trips on inrush
Weak harmonic restraint causes nuisance trips during traction transformer energisation.
No thermal insight
Zero visibility into coolant health risks winding burnouts under heavy rail loads.
Limited bay control
Fragmented systems require extra hardware for basic switchgear logic.
Meet MiCOM P638
— Purpose-built for traction transformers.
Engineered for AC railway substations, MiCOM P638 protects two-winding traction transformers with fast DIFF elements, inrush restraint, and integrated bay control for up to 10 units. A rugged, modular device built for rail conditions.
Differential
With Real Intelligence.
HV–LV matching and vector group compensation for stable traction tripping.
True transformer differential
HV–LV matching, vector group compensation, and harmonic restraint for stable tripping.
Through-fault stability
High-security bias ensures the relay stays quiet during heavy external faults.
Built-in feeder backup
Three-zone distance and directional overcurrent deliver backup protection.
Voltage & frequency clarity
Over/under-voltage elements secure sensitive railway power systems.
Thermal modelling
Advanced modelling with optional PT100 coolant temperature monitoring.
Complete bay control
Operate breakers and disconnectors directly — all interlocked.
Precision Engineering.
Railway Endurance.
Modular Build. High-end sensing. Advanced DIFF Logic.
Where MiCOM P638 Sets the Absolute Standard
Precision differential logic for two-winding traction transformer substations.
Traction Transformers
Selective protection for two-winding railway traction transformers.
Substation Feeders
Integrated distance and overcurrent backup for rail distribution.
Metro Switchyards
Complete bay control for breakers and disconnectors in urban hubs.
Depot Power
Overfluxing and frequency stability for maintenance terminal power.
Infrastructure Hubs
Multi-winding REF protection for specialized railway power assets.
Digital Substation
Dual Ethernet IEC 61850 integration for modern rail routes.
Traction Transformers
Selective protection for two-winding railway traction transformers.
Substation Feeders
Integrated distance and overcurrent backup for rail distribution.
Metro Switchyards
Complete bay control for breakers and disconnectors in urban hubs.
Depot Power
Overfluxing and frequency stability for maintenance terminal power.
Infrastructure Hubs
Multi-winding REF protection for specialized railway power assets.
Digital Substation
Dual Ethernet IEC 61850 integration for modern rail routes.
Traction Protection Tuned To
Your Network
Tailored assessment and vector group configuration for railway transformers
Relay Testing, Programming &
Configuration
Traction Substation Tuning
- Vector group matching
- Through-fault security study
- Catenary DIFF validation
Built For
Power Reliability
Trusted across utility and traction sectors
Railway & Metro
Utilities & Traction
Heavy Rail Routes
Industrial Bays
Complementary Units.
Engineering and maintenance services for traction transformer bays.
Platform Member
MiCOM P138
Platform Member
MiCOM P43x
Platform Member
MiCOM P13x
Platform Member