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Protection & Control
Transmission Protection



P44 MiCOMho 5th Generation Line Distance Protection Relay
  • Sub-Transmission/Transmission Distance Protection for 1 or 1 ½ Breaker applications.
  • True subcycle distance protection for transmission class security and dependability.
  • Distance phase preference tripping logic and transient earth fault detection (TEFD) for Petersen coil earthed and isolated systems.
  • Integrated full colour display, for single-line diagram control of the protected bay.
P54 MiCOM 5thGeneration Line Differential Protection Relay
  • Line Differential Protection with Sub-Transmission/Transmission Distance Protection for 1 or 1 ½ Breaker applications.
  • 2 or 3 End-to-end communications channels - multiplexed 64 kbps, E1 2Mbps, direct fibre, SONET/SDH and MPLS.
  • Integrated full colour display, for single-line diagram control of the protected bay.
P543/4/5/6 Line Differential Protection Relay (Optional Distance)
  • Advanced communications supporting IEC 61850 Ed.1 & Ed.2, redundant Ethernet, self-healing ring, RSTP, dual homing or PRP topologies
  • Full suite of monitoring, control and recording capabilities plus fault locator, autoreclose and check synchronism
  • Line-Differential with Optional Subcycle Distance for 1 ½ Breaker Applications (P544/6) and with 5 quadrilateral or mho zones and setting free power swing detection (P543/5)
  • P544 is under last-time buy.Orders may be placed until  30th June 2024 and will be fulfilled based upon availability. As an alternative, please refer to P54
D60 Line Distance Relay
  • High-speed transmission line protection with three/single pole tripping for medium to extra high voltage transmission lines
  • Large color graphical HMI and high density I/O option available.
P44T Catenary Distance Protection
  • Main distance with autoreclose and backup protection features.
  • True subcycle distance tripping.
  • Protection of classic or auto transformer-fed catenaries.
  • Advanced load blinding prevents false tripping due to encroachment of heavy loads.
L90 Line Differential Protection System
  • High-speed current differential and full distance protection with three and single pole tripping
  • Complete and advanced line protection system intended for application on overhead transmission lines, series compensated lines, and high voltage underground cables
  • Large color graphical HMI and high density I/O option available.
P441/2/4 Line Distance Management Relays
  • Distance Protection with Dual Algorithm
  • Full scheme multi-zone distance, plus aided directional earth fault (DEF) and comprehensive backup protection
  • Comprehensive communication options including IEC 61850 and redundant Ethernet ports, Hot standby-Ethernet & Cyber security
  • P441 is under last-time buy.Orders may be placed until  30th June 2024 and will be fulfilled based upon availability. As an alternative, please refer to P44 or P442
L60 Line Phase Comparison Relay
  • Flexible phase comparison protection for HV and EHV transmission lines.
  • Advanced line phase comparison relay intended for application on overhead transmission lines, series compensated lines, and high voltage underground cables
  • Large color graphical HMI and high density I/O option available.
P54A/B/C/E Multi-Ended Line Differential Protection
  • Proven protection for up to 6 line or cable ends
  • Advanced communications options, supporting IEC 61850 Edition 2, DNP 3.0, IEC 60870-5-103
  • 1/3-pole tripping line differential protection with back-up and inbuilt reclosing (P54E/C)
P443/5/6 MiCOMho Distance Protection Relays
  • Distance protection for transmission (P443/6) and subtransmission (P445)
  • True subcycle distance protection - transmission class security and dependability(P443/6)
  • 2nd Harmonic detection based on Sensitive Earth Fault (SEF) input (P443/5)
P547 Phase Comparison Relay with Distance Protection
  • Phase Comparison with Distance - unit protection, subcycle distance and directional earth fault (DEF)
  • Advanced charging current compensation and angle-shifting to avoid corona issues
  • Advanced communications supporting IEC 61850 redundant Ethernet, self healing ring, RSTP, dual homing or PRP topologies
  • P547 is under last-time buy.Orders may be placed until  29th December 2023 and will be fulfilled based upon availability. As an alternative, please refer to L60
L30 Line Current Differential System
  • High-speed current differential protection suited to sub-transmission and distribution protection.
  • Advanced current differential relay intended for application on sub-transmission and distribution lines
  • Large color graphical HMI and high density I/O option available.
D30 Line Distance Relay
  • Cost effective high-speed, three pole, primary and backup distance protection.
  • Large color graphical HMI and high density I/O option available.
P841 Line Terminal Protection System
  • IN/VN ratings to show a generic description, change of descriptions
  • Mounting to split out the small 40TE case for software 80, change of descriptions
P541 Line-Differential Protection Relay
  • Line differential protection with overcurrent backup protection with graphical programmable scheme logic (PSL)
  • Proven biased characteristic for distribution/sub-transmission networks
  • Advanced communications options, supporting IEC 60870-5-103, Modbus & Courier easing integration into SCADA systems
  • P541 is under last-time buy.Orders may be placed until  29th December 2024 and will be fulfilled based upon availability. As an alternative, please refer to P54
P591 Interface Unit - Fiber Optic to G.703
  • Standalone fiber optic to electrical communications interface unit
  • Allow connections to remote pulse code modulation multiplexing equipment
  • 10 TE case, suitable for flush mounting
  • Connections to ITU-T G.703 (co-directional)
P593 Interface Unit - Fiber Optic to X.21
  • Standalone fiber optic to electrical communications interface unit
  • Allow connections to remote pulse code modulation multiplexing equipment
  • 10 TE case, suitable for flush mounting
  • Connections to ITU-T X.21
P542 Line Differential Protection Relay
  • Line differential protection with overcurrent backup protection with graphical programmable scheme logic (PSL)
  • Proven biased characteristic for distribution/sub-transmission networks
  • Advanced communications options, supporting IEC 60870-5-103, Modbus & Courier easing integration into SCADA systems
  • P542 is under last-time buy.Orders may be placed until  29th December 2024 and will be fulfilled based upon availability. As an alternative, please refer to P54
P447 Line Distance Relay
P848 RPS Predictive Loss of Synchronisation
  • Rapid detection of Open Line condition and loss of synchronisation
  • Application for 60Hz Systems
P847 Phasor Measurement Unit
  • Measures accurate, time synchronised power system data
  • Communicates synchro-phasors according to IEEE C37.118.2-2011
  • Available with ancillary control and recording functions
  • Galvanic, fibre optic and redundant communication options (IEC 61850)
  • Synchrophasors available in dual streams
P448 Line Distance Relay
P846 Open Line Detector Relay
  • Detects open local or remote end breakers
  • Fast Operation