Toshiba GRL150-100 Series, Instruction Manual

Page: 54 / 267

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53
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6 F 2 S 0 8 2 8
Relay
setting and
monitoring
system
or
IEC60870-5
-103
Binary output
(Trip x 2
Alarm x 5
Fail x 1)
RS485
Transceiver
×
1 or 2
or Optical I/F
Auxiliary relay
×
8
Operation keys
RS232C
I/F
Liquid crystal display
16 characters
×
2 lines
Human machine
Interface (HMI)
Photo-coupler
×
8
Multi-
plexer Analogue
filter
DC/DC
Converter
A/D
converter
LEDs
RAM
MPU
ROM
DC
supply
SPMP
POWD
Local
personal
computer
AC input
I
CT
×
4
(Max)
Binary
input
Monitoring
jacks
O/E
E/O
S/P
P/S
Pilot wire
communication
Fibre optic
communication
5kV
insulation
Figure 3.1.1.2 Hardware Block Diagram
POWD Module
The POWD module insulates between the internal and external circuits through an auxiliary
transformer and transforms the magnitude of AC input signals to suit the electronic circuits. The
AC input signals may be one to three phase currents and a residual current depending on the relay
model.
This module incorporates max. 4 auxiliary CTs, DC/DC converter and 8 photo-coupler circuits for
binary input signals.
The available input voltage ratings of the DC/DC converter are, 24V, 48V, 110V/125V or
220/250V. The normal range of input voltage is
−
20% to
+
20%.
SPMP Module
The SPMP module consists of analogue filter, multiplexer, analogue to digital (A/D) converter,
main processing unit (MPU), random access memory (RAM) and read only memory (ROM) and
executes all kinds of processing such as protection, measurement, recording and display, and also
executes communication 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 analogue filter performs low-pass filtering for the corresponding current signals.
The A/D converter has a resolution of 12 bits and samples input signals at sampling frequencies of
2400 Hz (at 50 Hz) and 2880 Hz (at 60 Hz).