MiCOM P44x delivers fast, accurate multi-zone distance protection for lines and cables — built to secure transmission and distribution networks with precision, stability and scheme-ready intelligence.
Explore MoreAging relays misjudge zones, miss evolving faults, struggle with swings, and lose selectivity on weak networks. One wrong trip can ripple across the grid.
The MiCOM P44x family (P442 / P444) delivers full-scheme distance protection with six configurable zones, powerful quadrilateral characteristics and fast ground/phase discrimination. It secures overhead lines, cables, tapped feeders and series-compensated or parallel circuits with robust backup: overcurrent, earth fault, voltage, frequency, power swing blocking and breaker-fail logic. With advanced PSL, deep recording, and high-availability comms, it fits anywhere distance protection must be reliable, selective and fast.
Stability, selectivity and speed — even under swings and weak infeed.
Quadrilateral 21P/21G schemes built for every line topology.
Channel-aided DEF and sensitive ground logic for high-impedance faults.
Power swing blocking and out-of-step protection to avoid false trips.
Directional O/C, earth fault, thermal, voltage, frequency and broken conductor logic.
Two-stage breaker failure and trip-circuit monitoring.
Waveforms, SOE, disturbance records and live measurements at relay level.
Every module built to meet high-performance line protection standards.
Any line. Any compensation. Any network condition.
Ideal for utilities, industries and any network relying on line protection.
We test, parameterize and validate P44x schemes for every line type and protection philosophy.
Complementary protection, communication, and substation automation solutions engineered to work with MiCOM P44x, enabling secure distance schemes, dependable backup protection, and seamless integration across T&D networks.
Talk to our experts to configure, modernise or integrate MiCOM P44x into your network.
