Transformer Protection That Thinks Faster Than Faults.
MiCOM P64x delivers high-speed differential, REF, and thermal protection built for multi-winding zones where precision is absolute.
A Fault Doesn't Wait.
Your Protection Shouldn't Either.
Older relays misjudge inrush and ignore overfluxing. That means false trips, long outages and high-value transformers pushed beyond safe physical limits.
Slow fault isolation
Delayed response to internal faults risks catastrophic core and stator damage.
Poor inrush restraint
Standard units misread energisation, causing nuisance trips and substation downtime.
Weak earth-fault sensitivity
Missed low-level internal ground faults can escalate into transformer fires.
No overfluxing defense
Inability to restrain during V/Hz surges pushes cores beyond safe magnetic limits.
Limited event insights
Generic relays lack the recording depth required for EHV-grade grid forensics.
Meet MiCOM P64x
— Transformer-grade protection, perfected.
The P64x family (P642 / P643 / P645) brings phase-segregated differential protection with transformer-specific logic. Fits simple two-winding units and complex EHV autotransformers alike with modular 40–80TE hardware.
Protection Tuned To
Transformer Physics.
From overfluxing to winding faults — P64x adapts to real physics and transformer behavior.
REF for the smallest faults
Low- and high-impedance options detect internal earth faults early.
Thermal expertise built in
IEEE-based thermal modelling protects winding hot-spots and top-oil levels.
Overfluxing control
Multi-stage V/Hz protection keeps magnetic stress in check during grid swings.
Directional backup
Four fully configurable stages for selective internal and external fault isolation.
Smart supervision everywhere
Continuous VT/CT monitoring, breaker failure, and negative sequence diagnostics.
High-speed differential logic
Phase-segregated and stable even during CT saturation and heavy inrush.
Designed For Winding Selectivity & Accuracy
Modular Build. High-end sensing. Overfluxing defense.
Where MiCOM P64x Delivers Clarity
Protection that fits every transformer topology from simple units to EHV autotransformers.
EHV Transformer Bays
High-speed differential logic for transmission-level grid assets.
Two-Winding Units
Stable and selective protection for standard Distribution Transformers.
Autotransformers
Specialized compensation logic for complex autotransformer configurations.
Ring Bus Stations
Integrated bay control and protection for mesh station topologies.
Industrial Substations
Rugged protection for manufacturing hubs with continuous load switching.
Three-Winding Units
Coordinated three-end differential logic for multi-winding assets.
EHV Transformer Bays
High-speed differential logic for transmission-level grid assets.
Two-Winding Units
Stable and selective protection for standard Distribution Transformers.
Autotransformers
Specialized compensation logic for complex autotransformer configurations.
Ring Bus Stations
Integrated bay control and protection for mesh station topologies.
Industrial Substations
Rugged protection for manufacturing hubs with continuous load switching.
Three-Winding Units
Coordinated three-end differential logic for multi-winding assets.
Transformer Protection Set Up
Exactly Right
We configure, test and verify P64x settings for every winding, tap and fault scenario
Switchyard Complete Testing,
Commissioning & Maintenance
Technical Implementation
- Circuit Breaker Overhauling & Testing
- HT & LT Panel Testing & Maintenance
- Relay Testing, Programming & Configuration
Made For Transformers.
Built For Critical Networks.
Ideal for high-duty networks with continuous load and complex switching.
Transmission utilities
Distribution networks
Heavy industries
Refineries & process plants
Generation switchyards
Complementary Units.
Compatible protection, monitoring, and communication products designed to operate alongside MiCOM P64x.
MiCOM Platform Member
MiCOM P14x
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MiCOM P24x
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MiCOM P341 & MiCOM P922G
MiCOM Platform Member