x/EN ST/Na7
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MiCOM P74
Menu Text Default Setting Available Settings
COMMISSION TESTS
Test Mode Disabled Disabled /Out Of Service
The Test Mode menu cell is used to allow secondary injection testing to be performed on a
Peripheral Unit 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 test
mode the Test Mode menu cell should be set to ‘Out of Service’, which takes the relay out
of service. It also causes an alarm condition to be recorded and the yellow ‘Out of Service’
LED to illuminate and an alarm message ‘Out of Service’ is given. The differential busbar
protection (87BB) and 50BF protection are in service as long as the cells ‘87BB Monitoring’
and ‘87BB & 50BF disabl’ are equal to 0. Once testing is complete the cell must be set back
to ‘Disabled’ to restore the relay back to service.
Test Pattern 00000000
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’.
87BB Monitoring All bits set to 0
Each bit represents 1 zone
0 = In Service
1 = 87BB blocked
This cell is used to select the zone on which the differential busbar protection (87BB) will be
disabled.
87BB & 50BF disabl All bits set to 0
Each bit represents 1 zone
0 = In Service
1 = 87BB and 50BF blocked
Visible when “Test Mode“ is disabled
This cell is used to select the zone on which the differential busbar (87BB) AND 50BF
protections will be disabled.
BB Trip Pattern 00000000 0 = In Service
1 = Out of Service
Visible when “Test Mode“ is disabled
This cell is used to select the zone that will be tested when the ‘BB Trip Command’ cell is
set to ‘Apply Test’.
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