Relay System Overview; Hardware Overview; Power Supply Module; Main Processor Board - GE MiCOM P40 Agile Technical Manual

Firmware Design
MiCOM P40 Agile P442, P444
1

RELAY SYSTEM OVERVIEW

1.1

Hardware overview

The relay hardware is based on a modular design whereby the relay is made up 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

Power supply module

The power 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 RS485 electrical
connection for the rear communication port. On a second board the power supply module
contains relays which provide the output contacts.
1.1.2

Main processor board

The processor board performs most of the calculations for the relay (fixed and
programmable scheme logic, protection functions other than distance protection) and
controls the operation of all other modules within the relay. The processor board also
contains and controls the user interfaces (LCD, LEDs, keypad and communication
interfaces).
1.1.3 Co-processor board
The co-processor board manages the acquisition of analogue quantities, filters them and
calculates the thresholds used by the protection functions. It also processes the distance
algorithms.
1.1.4 Input module
The input module converts the information contained in the analogue and digital input signals
into a format suitable for the co-processor board. The standard input module consists of two
boards: a transformer board to provide electrical isolation and a main input board which
provides analogue to digital conversion and the isolated digital inputs.
1.1.5 Input and output boards
Opto-inputs
Relay outputs
(1)
Universal voltage range opto inputs
(1)
Up to 46 outputs (in option)
1.1.6 IRIG-B modulated or unmodulated board
The modulated or unmodulated IRIG-B board, which is optional, 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 fibre optic rear communication port, for use with IEC 60870 communication only.
• A second rear port designed typically for dial-up modem access by protection
engineers/operators (see section 1.1.7).
All modules are connected by a parallel data and address bus which allows the processor
board to send and receive information to and from the other modules as required. There is
also a separate serial data bus for conveying sample data from the input module to the
processor. Figure 1 shows the modules of the relay and the flow of information between
them.
P442 P444
(1) (1)
16 x UNI 24 x UNI
9 N/O 24 N/O
(2)
12 C/O 8 C/O
N/O – normally open
C/O – change over
P44x/EN FD/Hb6
(FD) 8-5