x/EN ST/Na7
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MiCOM P74
Menu Text Default Setting Available Settings
COMMISSION TESTS
Monitor Bit 8 Relay Label 08 0 to 2047
The eight ‘Monitor Bit’ cells allow the user to select the status of which digital data bus
signals can be observed in the ‘Test Port Status’ cell or via the monitor/download port.
Test Mode Disabled
Disabled / 50BF Disabled /
Overhaul
The Test Mode menu cell is used to ease the maintenance of an other feeder relay or to
allow secondary injection testing to be performed on the relay without operation of the
connected zone. It also enables a facility to directly test the output contacts by applying
menu controlled test signals. To select a test mode the Test Mode menu cell should be set
to ‘50BF Disabled’, which blocks the breaker failure function or to ‘Overhaul’ which allow the
complete test of the relay. It also causes an alarm condition to be recorded and the yellow
‘Out of Service’ LED to illuminate and an alarm message ‘50BF Disabled’ or ‘Overhaul’ is
given. Once testing is complete the cell must be set back to ‘Disabled’ to restore the relay
back to service.
Test Pattern 00000000000000000000
0 = Not Operated
1 = Operated
Visible when “Test Mode“ is disabled
This cell is used to select the output relay (or high break relay) contacts that will be tested
when the ‘Contact Test’ cell is set to ‘Apply Test’.
Contact Test No Operation
No Operation, Apply Test,
Remove Test
Visible when “Test Mode“ is disabled
When the ‘Apply Test’ command in this cell is issued the contacts set for operation (set to
‘1’) in the ‘Test Pattern’ cell change state. After the test has been applied the command text
on the LCD will change to ‘No Operation’ and the contacts will remain in the Test State until
reset issuing the ‘Remove Test’ command. The command text on the LCD will again revert
to ‘No Operation’ after the ‘Remove Test’ command has been issued.
Note: When the ‘Test Mode’ cell is set to ‘Enabled’ the ‘Relay O/P Status’ cell does
not show the current status of the output relays and hence can not be used to
confirm operation of the output relays. Therefore it will be necessary to monitor
the state of each contact in turn.
Test LEDs No Operation
No Operation
Apply Test
When the ‘Apply Test’ command in this cell is issued the eighteen user-programmable
LEDs will illuminate for approximately 2 seconds before they extinguish and the command
text on the LCD reverts to ‘No Operation’.
Position Pattern 0000000
0 = To Force Opened
1 = To Force Closed
This cell is used to select the forced position of the isolators and the circuit breaker when
the ‘Test Mode’ is ‘Overhaul’. The advised position is Opened for all the isolators and the
circuit breaker, the position closed should be used only for the isolators connected to a
transfer bus.
Red LED Status
(P743 only)
000000000000000000
This cell is an eighteen bit binary string that indicates which of the user-programmable
LEDs on the relay are illuminated with the Red LED input active when accessing the relay
from a remote location, a ‘1’ indicating a particular LED is lit and a ‘0’ not lit.
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