157
6
F
2
S
0
8
3
4
3.1.3 Signal Processing Module
The signal processing and communication module (SPM) incorporates a signal processing
circuit and a telecommunication control circuit. Figure 3.1.3.1 shows the block diagram. The
telecommunication control circuit is incorporated in the sub-module GCOM.
The signal processing circuit consists of an analog filter, multiplexer, analog to digital (A/D)
converter, main processing unit (MPU1) and memories (RAM and ROM), and executes all kinds
of processing including protection, measurement, recording and display.
The analog filter performs low-pass filtering for the corresponding current and voltage signals.
The A/D converter has a resolution of 16 bits and samples input signals at sampling frequencies
of 2400Hz (at 50Hz) and 2880Hz (at 60Hz).
The MPU1 carries out operations for the measuring elements and scheme logic operations for
protection, recording, displaying and signal transmission control. It implements 60 MIPS and
uses two RISC (Reduced Instruction Set Computer) type 32-bit microprocessors.
The telecommunication control circuit consists of MPU2 executing control processing of local
and received data, memories (RAM and ROM), parallel-to-serial and serial-to-parallel data
converter, and electrical-to-optical and optical-to-electrical converter.
The SPM can be provide with Optical interface or Ethernet LAN interface for serial
communication system.
Figure 3.1.3.1 Signal Processing and Communication Module
Telecommuni-
cation system
Analog filter
Other
modules
A/D
converter
MPU1
Analog filter
Analog filter
Multiplexer
Analog
input
MPU2
P/S
S/P
RAM
ROM
ROM
RAM
E/O
O/E
GCOM
Optical I/F
(Option)
Link with Serial
communication
system
Ethernet
LAN I/F
(Option)
Link with Serial
communication
system
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Summary of Contents for GRZ100-211B
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