Transformer protection that thinks faster than faults
MiCOM P64x delivers high-speed differential, REF, thermal, and overfluxing protection — built for two-winding, three-winding and autotransformer zones where precision is everything.
Explore MoreA transformer fault doesn’t wait. Your protection shouldn’t either
Older relays misjudge inrush, ignore negative-sequence stress, miss early earth faults and fail to restrain during overfluxing. That means false trips, long outages and transformers pushed beyond safe limits.
Meet MiCOM P64x — transformer-grade protection, perfected
The MiCOM P64x family (P642 / P643 / P645) brings phase-segregated differential protection with transformer-specific logic for stable, selective and fast response. It covers REF, thermal, overfluxing, directional overcurrent, negative sequence, voltage and frequency — all backed by programmable logic, deep recording and SCADA-ready communication. With flexible I/O, Ethernet options, fiber links, and optional process-bus integration, P64x fits simple two-winding units and complex EHV autotransformers alike.
Protection tuned to transformer behaviour
From overfluxing to winding faults, P64x adapts to real transformer physics.
High-speed differential logic
Phase-segregated, secure, and stable even during inrush and CT saturation.
REF that sees 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.
Overfluxing control that saves cores
Multi-stage V/Hz protection keeps magnetic stress in check.
Directional overcurrent backup
Four fully configurable stages for internal and external faults.
Smart supervision everywhere
VT/CT monitoring, breaker failure, negative sequence and deep diagnostics.
Engineered for accuracy, stability and endurance
Hardware flexibility with transformer-centric performance.
Where MiCOM P64x delivers clarity
Protection that fits every transformer topology.
Made for transformers. Built for critical networks
Ideal for high-duty networks with continuous load and complex switching.
Transmission utilities
Transformer protection set exactly right
We configure, test and verify P64x settings for every winding, tap and fault scenario.
Services
Switchyard Complete Testing, Commissioning & Maintenance
Supporting systems for complete transformer schemes
A compatible range of protection, monitoring, and communication products that work alongside MiCOM P64x to deliver coordinated backup protection, seamless SCADA integration, and long-term operational reliability.
Upgrade your transformer protection
Talk to our relay specialists to deploy or modernise your protection with MiCOM P64x.
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