Technical articles
Line differential protection RED670 1MRK505228-BEN E-Remote communication
Date: May 05, 2026 Views: 4586
Analog and binary signal transfer to remote end
Three analog and eight binary signals can be exchanged between two IEDs. This functionality is mainly used for the line differential protection. However it can be used in other products as well. An IED can communicate with up to 4 remote IEDs.
Binary signal transfer to remote end, 192 signals
If the communication channel is used for transfer of binary signals only, up to 192 binary signals can be exchanged between two IEDs. For example, this functionality can be used to send information such as status of primary switchgear apparatus or intertripping signals to the remote IED. An IED can communicate with up to 4 remote IEDs.
Line data communication module, short, medium and long range LDCM
The line data communication module (LDCM) is used for communication between the IEDs situated at distances <110 km or from the IED to optical to electrical converter with G. 703 or G.703E1 interface located on a distances <3 km away. The LDCM module sends and receives data, to and from another LDCM module. The IEEE/ANSI C37.94 standard format is used.
Galvanic X.21 line data communication module X.21-LDCM
A module with built-in galvanic X.21 converter which e.g. can be connected to modems for pilot wires is also available.
Galvanic interface G.703 resp G.703E1
The external galvanic data communication converter G.703/G. 703E1 makes an optical-to-galvanic conversion for connection to a multiplexer. These units are designed for 64 kbit/s resp 2Mbit/s operation. The converter is delivered with 19” rack mounting accessories.
Hardware description
Hardware modules
Power supply module PSM
The power supply module is used to provide the correct internal voltages and full isolation between the terminal and the battery system. An internal fail alarm output is available.
Binary input module BIM
The binary input module has 16 optically isolated inputs and is available in two versions, one standard and one with enhanced pulse counting capabilities on the inputs to be used with the pulse counter function. The binary inputs are freely programmable and can be used for the input of logical signals to any of the functions. They can also be included in the disturbance recording and event-recording functions. This enables extensive monitoring and evaluation of operation of the IED and for all associated electrical circuits.
Binary output module BOM
The binary output module has 24 independent output relays and is used for trip output or any signaling purpose.
Static binary output module SOM
The static binary output module has six fast static outputs and six change over output relays for use in applications with high speed requirements.
Binary input/output module IOM
The binary input/output module is used when only a few input and output channels are needed. The ten standard output channels are used for trip output or any signaling purpose. The two high speed signal output channels are used for applications where short operating time is essential. Eight optically isolated binary inputs cater for required binary input information.
mA input module MIM
The milli-ampere input module is used to interface transducer signals in the –20 to +20 mA range from for example OLTC position, temperature or pressure transducers. The module has six independent, galvanically separated channels.
Optical ethernet module OEM
The optical fast-ethernet module is used to connect an IED to the communication buses (like the station bus) that use the IEC 61850-8-1 protocol (port A, B). The module has one or two optical ports with ST connectors.
Serial and LON communication module SLM, supports SPA/ IEC 60870-5-103, LON and DNP 3.0
The serial and LON communication module (SLM) is used for SPA, IEC 60870-5-103, DNP3 and LON communication. The module has two optical communication ports for plastic/ plastic, plastic/glass or glass/glass. One port is used for serial communication (SPA, IEC 60870-5-103 and DNP3 port or dedicated IEC 60870-5-103 port depending on ordered SLM module) and one port is dedicated for LON communication.
Line data communication module LDCM
Each module has one optical port, one for each remote end to which the IED communicates.
Alternative cards for Long range (1550 nm single mode), Medium range (1310 nm single mode) and Short range (850 nm multi mode) are available.
Galvanic X.21 line data communication module X.21-LDCM
The galvanic X.21 line data communication module is used for connection to telecommunication equipment, for example leased telephone lines. The module supports 64 kbit/s data communication between IEDs.
Examples of applications:
• Line differential protection
• Binary signal transfer
Galvanic RS485 serial communication module
The Galvanic RS485 communication module (RS485) is used for DNP3.0 communication. The module has one RS485 communication port. The RS485 is a balanced serial communication that can be used either in 2-wire or 4-wire connections. A 2-wire connection uses the same signal for RX and TX and is a multidrop communication with no dedicated Master or slave. This variant requires however a control of the output. The 4-wire connection has separated signals for RX and TX multidrop communication with a dedicated Master and the rest are slaves. No special control signal is needed in this case.
GPS time synchronization module GTM
This module includes a GPS receiver used for time synchronization. The GPS has one SMA contact for connection to an antenna. It also includes an optical PPS STconnector output.
IRIG-B Time synchronizing module
The IRIG-B time synchronizing module is used for accurate time synchronizing of the IED from a station clock.
Transformer input module TRM
The transformer input module is used to galvanically separate and transform the secondary currents and voltages generated by the measuring transformers. The module has twelve inputs in different combinations of currents and voltage inputs.
Alternative connectors of Ring lug or Compression type can be ordered.
High impedance resistor unit
The high impedance resistor unit, with resistors for pick-up value setting
and a voltage dependent resistor, is available in a single phase unit and a
three phase unit. Both are mounted on a 1/1 19 inch apparatus plate with
compression type terminals.
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