P54x/EN CM/La4 Commissioning
(CM) 10-10
MiCOM P543, P544, P545 & P546
CM
2.6 Test mode
This menu cell is to allow secondary injection testing to be performed on the relay. It also
enables a facility to directly test the output contacts by applying menu controlled test signals.
To select test mode the option ‘Test Mode’ should be selected. This takes the relay out of
service causing an alarm condition to be recorded and the yellow ‘Out of Service’ LED to
illuminate. This also freezes any information stored in the CB CONDITION column and in
IEC 60870-5-103 versions, changes the Cause of Transmission, COT, to Test Mode.
However the output contacts are still active in this mode. To disable the output contacts in
addition to the above select ‘Blocked’. Once testing is complete the cell must be set back to
‘Disabled’ to restore the relay back to service. Test mode can also be selected by energizing
an opto mapped to the Test Mode signal.
WHEN THE ‘TEST MODE’ CELL IS SET TO ‘BLOCKED’ THE RELAY SCHEME LOGIC
DOES NOT DRIVE THE OUTPUT RELAYS AND HENCE THE PROTECTION WILL NOT
TRIP THE ASSOCIATED CIRCUIT BREAKER IF A FAULT OCCURS.
2.7 Test pattern
The ‘Test Pat
tern’ cell is used to select the output relay contacts that will be tested when the
‘Contact Test’ cell is set to ‘Apply Test’. The cell has a binary string with one bit for each
user-configurable output contact which can be set to ‘1’ to operate the output under test
conditions and ‘0’ to not operate it.
2.8 Contact test
When the ‘Apply Test’ com
mand 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 ‘Contacts Blocked’ 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.
2.9 Test LEDs
Whe
n the ‘Apply Test’ command in this cell is issued the eighteen user-programmable LEDs
will illuminate yellow for approximately 2 seconds before they extinguish and the command
text on the LCD reverts to ‘No Operation’.
2.10 Test auto-reclose
Where the relay provides an auto-reclose function, this cell
will be available for testing the
sequence of circuit breaker trip and auto-reclose cycles with the settings applied.
Issuing the command ‘3 Pole Trip’ will cause the relay to perform the first three phase
trip/reclose cycle so that associated output contacts can be checked for operation at the
correct times during the cycle. Once the trip output has operated the command text will
revert to ‘No Operation’ whilst the rest of the auto-reclose cycle is performed. To test
subsequent three phase auto-reclose cycles repeat the ‘3 Pole Trip’ command.
Similarly, where single pole auto-reclosing is available, the cycles for each single pole can
be checked by sequentially issuing the ‘Pole A Test’, ‘Pole B Test’ or ‘Pole C Test’, as
appropriate.
To Next Page
Loading...
