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I.L. 40-385.1B
1-2
(5/92)
1.3.2
Interconnect Module
The Interconnect module (see Appendix B) becomes
the floor of the MDAR inner chassis; it provides elec-
trical connections from and to all other modules:
from the Backplane (at the rear), to the Filter and
Power Supply modules (at left and right, respective-
ly), and to the Microprocessor and Display modules
at the front of the inner chassis.
The Interconnect module receives inputs V
A N
, V
B N
,
V
C N
, I
A
, I
B
, I
C
, I
P
from the Backplane module and
feeds them to the Filter module. The I
P
input is used
for zero-sequence dual-polarizing ground current
measurement; the input is from the power transform-
er neutral ct. Also, seven opto-couplers, on the Inter-
connect module, send the following signals to the
Microprocessor module:
• External Reset - resets the front target display.
• 52b - used for close-into-fault (CIF) detection,
load loss trip (LLT) and carrier-start and stop con-
trol in a pilot system.
• 52a (for single-pole trip option; i.e., for pole dis-
agreement).
• Pilot Enable - should be “ON” for the pilot system
option.
• Receiver #1 (for Pilot option) - carrier receiver for
two terminal application.
• Receiver #2 (for Pilot option) - second carrier re-
ceiver for three-terminal application.
• SBP (89b) for stub bus protection.
1.3.3
Option Module
For 3-pole tripping application, an optional Contact
module can be plugged into the connector and pro-
vide 8 additional programmable output contacts.
1.3.4
Filter Module
The Filter module (see Appendix D) band-limits the
seven inputs from the Interconnect module: V
AN
,
V
BN
, V
CN
, I
A
, I
B
, I
C
, I
P
. These inputs are fed to the
Microprocessor module (analog signal multiplexer).
1.3.5
Microprocessor Module
The Microprocessor module (see Appendix E) in-
cludes the following subsystems:
• Microprocessor - Intel 80C196, a 16-bit micro-
controller operating with a 10 MHz clock.
• EPROM - Program memory in separate, easily-
replaced EPROM chips.
• PROM - Programmable read-only memory.
• RAM - Volatile read-write memory, for working
storage.
• NOVRAM (EEPROM) - Non-volatile memory for
storing settings and fault-data targets when the
MDAR relay is deenergized.
• A/D Converter - The seven inputs from the filter
module are analog-multiplexed to a single sam-
ple/hold circuit. The output of the sample/hold is
fed to the Analog-to-Digital Converter through an
auto-ranging circuit which shifts gain by a factor of
eight.
• Digital I/O Circuitry - Status inputs from breaker
auxiliary contacts (52a and 52b), and External
Reset signal are interfaced to the microprocessor
via optical isolators (Figure 4-2). The micropro-
cessor executes control outputs using dry con-
tacts. Output relays (Figure 4-2) are used for
breaker tripping, breaker failure initiation (BFI), re-
close initiation (RI), and reclose blocking (RB).
General start contact (GS) is provided for starting
the external sequence of events or fault record-
ers. Trip and relay-failure alarm contacts are in-
cluded. Reed relays in the trip circuits sense trip
coil current flow and feedback target information
to the microprocessor.
1.3.6
Display Module
The Display module has two (four-digit) alphanumer-
ic displays for settings, metering fault designation
and information. The metering display shows three-
phase voltage, current and angle. Fault data, stored
in the Microprocessor module, is accessible through
the front panel display. Fault data includes: pre-fault
phase A voltage, current and angle. It also shows the
type of fault, fault voltages, currents, angles and fault
location. The Display module is attached to the front
panel (see Figure 1-1); it can be used to access and
store data, and contains 7 LEDs, as follows:
• Relay in Service (ready to use)
• Settings (can read or change settings)
• Volts/Amps/Angles (can read measuring inputs)
• Last Fault (when flashing, indicates new fault in-
formation available)
• Previous Fault (when last fault LED flashes twice/
minute, indicates information for the fault preced-
ing the last fault)
• Value Accepted (when the Settings LED is also
“ON”, a new setting value is accepted; when the
Test LED is also “ON”, the output contacts can be
tested)
Содержание REL-300
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Страница 116: ...I L 40 385 1B 6 14 5 92 Figure 6 1 Test Connection for Single Phase to Ground Faults Sheet 1 of 4...
Страница 117: ...I L 40 385 1B 5 92 6 15 Figure 6 2 Test Connection for Three Phase Faults 1502B51 Sub 1 Sheet 2 of 4...
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Страница 135: ...I L 40 385 1B SD 6 5 92 Figure SD 2 MDAR Block Diagram sheet 1 of 1 Sub 1 1611C12...