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Transmission Line Protection Relay - L-PRO


L-PRO provides easy to use, state of the art comprehensive distance and backup directional line protection for all voltages including Extra High Voltage transmission lines using communication based schemes.  It provides control, automation, metering, monitoring, DFR-quality fault oscillography, dynamic swing recording, fault logging, sequence of event logging with advanced communication features in a flexible, cost effective package


  • Suitable for Overhead lines and underground cables (using pilot protection schemes)
  • Backup protection for generators, transformers and reactors
  • Ideal for multi-circuit line applications (to monitor mutual coupling via additional CT inputs)
  • Suitable for Series Compensated Lines

Features and Benefits

Easy to use

  • Easy-to-use, install and maintain
  • Easy to order - no complex product codes
  • User-friendly, Windows based relay setting and record analysis software
  • Setting software tool - relay specific application
  • On Line setting tool
  • Flexible programmable logi for building custmized sches with ProLogic statements - 24 control Logic statements (total of 192 statements)

Reduced Installation and Operation Cost

  • Substation automation cost - includes IEC 61850 protocol along with Optional PRP to display and transfer operational data via LAN/DAN for local HMI and wide-area network(WAN) for remote monitoring SCADA
  • Engineering, installation and commissioning cost - IEC 61850 GOOSE messages communicate high-speed information between IEDs on the substation LAN/DAN
  • Product setting time - 128 X 64 LCD graphical user interface provides convenient means to verify / change specific settings and parameters
  • Front panel indicators - 18 user-configurable LEDs, and Fixed 4 LEDs - Relay Functional, IRIG-B Functional, Service Required, Test Mode


Flexible Communications

  • 100BASE -TX RJ-45 or 100BASE-FX 1300nm multimode Optical with ST style connector
  • Ethernet ports with PRP compliant(Optional)
  • Front panel USB interface

Substation Automation - Ethernet Ready

  • Standard IEC 61850 Station Bus & Optional PRP (IEC62439-3) on a dedicated Optical / Copper Ethernet port
  • Enhanced DNP3 SCADA communication protocol including user Selectable points lists, class support and multiple master stations Support
  • Modbus SCADA communication protocol
  • 30 Virtual inputs for local and remote control

Multi-Functional Recording and Event Logging

  • Exceptional fault recording capabilities (with 128 samples/cycle)
  • User selectable pre-fault and total record length of maximum                 10 seconds/record with a total memory of 150 seconds, rocords can have a combination of transient / event & swing rocords.
  • Swing recording characteristics with 1 sample / Cycle, Record Length from 60 to 120 second with pre trigger of 30 seconds
  • Metering functions for each input connection
  • Seuence of event recorder - 250 events with 1 ms resolution (a compressed sequence of event file is created approximately every 230 events)

RecordGraph and REcordBase View

  • Display multiple channel simultaneously and combine records
  • Display multiple component voltage, current or summed channels
  • Display THD, harmonic magnitude
  • Display sub-harmonic THD, sub-harmonic magnitude
  • Zoom, alignment, scaling, unit functions
  • Record summaries including event lists
  • COMTRADE, PTI & MS Excel Export functions





Standard Features
IEC 61850 communication via optical portsFaster processing capability
Enhanced user configurable logicSingle pole trip and reclose

4000 Series_RCP User Manual
L-PRO4500_User Manual
Firmware release notes
Lpro4500 firmware release
L-PRO4500_Ordering Sheet
L-PRO 4000 Offliner Installation
RCP 4000 Installation
ERL 61850 IED Configurator
FT232 Driver
Record Graph
Autocad Drawings
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