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I.L. 40-385.7
1.3
REL300 MODULES
The inner and outer chassis, together, contain 6 standard modules, plus the option module for
single pole trip applications (see Figure 1-2). The Backplate is connected to the Backplane
module (outer chassis). The remaining modules are attached to the inner chassis:
• Interconnect module
• Option module or Contact module
• Filter module
• Microprocessor module
• Display module
• Power Supply module
Circuit descriptions for each module, may be found in Appendices A thru G, in accordance with
the list in the Preface to this document (see "Contents of Relay System").
1.3.1 Backplane Module
The Backplane Assembly includes three voltage transformers, four current transformers, two
filter chokes and several surge protection capacitors.
The Backplane Module (see Appendix A) receives all external connections (with or without the
FT-14 switch option), and connects directly to the Interconnect module, thru plug-in connectors
(J11, J12, J13) which provide the connection between outer and inner chassis.
The female parts of the connectors are mounted on the Backplane module, which is part of the
outer chassis. The male parts of the connectors are mounted on the Interconnect module,
which is part of the inner chassis.
The INCOM
sis and is connected to the Backplane module.
1.3.2 Interconnect Module
The Interconnect module (see Appendix B) becomes the floor of the REL300 inner chassis; it
provides electrical connections from and to all other modules: from the Backplane (at the rear),
to the Filter and Power Supply modules (at left and right, respectively), and to the Microproces-
sor and Display modules at the front of the inner chassis.
The Interconnect module receives inputs V
ule and feeds them to the Filter module. The I
ground current measurement; the input is from the power transformer neutral ct. Also, seven
opto-couplers, on the Interconnect module, send the following signals to the Microprocessor
module:
• External Reset - resets the target display.
• 52b - used for close-into-fault (CIF) detection, load loss trip (LLT) and carrier-start and stop
control in a pilot system.
1.
"INCOM "stands for INtegrated COMmunications. The " PONI " acronym stands for Product Operated Network Interface.
1-2
®
1
or RS232 PONI
(see Figure 1-3) is mounted on the Backplate of the outer chas-
, V
, V
, I
, I
, I
, I
A N
B N
C N
A
B
C
input is used for zero-sequence dual-polarizing
P
from the Backplane mod-
P
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