Firmware Design P54x/EN FD/La4
MiCOM P543, P544, P545 & P546
(FD) 9-3
FD
1. RELAY SYSTEM OVERVIEW
1.1 Hardware overview
The relay hardware is based on a modular design whereby the relay is made up of an
assemblage of several modules which are drawn from a standard range. Some modules are
essential while others are optional depending on the user’s requirements.
The different modules that can be present in the relay are as follows:
1.1.1 Processor board
The processo
r board performs all calculations for the relay and controls the operation of all
other modules within the relay. The processor board also contains and controls the user
interfaces (LCD, LEDs, keypad, function keys and communication interfaces).
1.1.2 Co-processor board (optionally with interMiCOM
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fiber teleprotection)
Used to process the current differential protection algorithms and associated communication.
It contains the optical fiber transmit and receive hardware and serial data communication
controller for the differential protection signaling and InterMiCOM
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teleprotection.
1.1.3 Analog/digital input module
The in
put module converts the information contained in the analog and digital input signals
into a format suitable for processing by the processor board. The standard input module
consists of two boards: a transformer board to provide electrical isolation and a main input
board which provides analog to digital conversion (with local storage of the calibration data)
and the isolated digital (“opto”) inputs.
1.1.4 Power supply module
The p
ower supply module provides a power supply to all of the other modules in the relay, at
three different voltage levels. The power supply board also provides the EIA(RS)485
electrical connection for the rear communication port. On a second board the power supply
module contains the relays that provide the output contacts.
The power supply module also provides a 48 V external field supply output to drive the opto
isolated digital inputs (or the substation battery may be used to drive the optos).
1.1.5 IRIG-B modulated or demodulated board (optional)
This boa
rd, can be used where an IRIG-B signal is available to provide an accurate time
reference for the relay. There is also an option on this board to specify a fiber optic rear
communication port, for use with IEC 60870 communications only.
1.1.6 Second rear comms and EIA(RS)232 interMiCOM
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board (optional)
The optional second rear port is designed typically for dial-up modem access by protection
engineers/operators, when the main port is reserved for SCADA traffic. Communication is via
one of three physical links: K-Bus, EIA(RS)485 or EIA(RS)232. The port supports full local
or remote protection and control access by MiCOM S1 Studio software. The second rear port
is also available with an on board IRIG-B input.
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