3 COMMISSIONING TEST MENU
The IED provides several test facilities under the COMMISSION TESTS
menu heading. There are menu
cells that allow you to monitor the status of the opto-inputs, output relay contacts, internal Digital Data Bus
(DDB) signals and user-programmable LEDs. This section describes these commissioning test facilities.
3.1 OPTO I/P STATUS CELL (OPTO-INPUT STATUS)
This cell can be used to monitor the status of the opto-inputs while they are sequentially energised with a
suitable DC voltage. The cell is a binary string that displays the status of the opto-inputs where '1' means
energised and '0' means de-energised. If you move the cursor along the binary numbers, the corresponding
label text is displayed for each logic input.
3.2 RELAY O/P STATUS CELL (RELAY OUTPUT STATUS)
This cell can be used to monitor the status of the relay outputs. The cell is a binary string that displays the
status of the relay outputs where '1' means energised and '0' means de-energised. If you move the cursor
along the binary numbers, the corresponding label text is displayed for each relay output.
The cell indicates the status of the output relays when the IED is in service. You can check for relay damage
by comparing the status of the output contacts with their associated bits.
Note:
When the Test Mode cell is set to Contacts Blocked, the relay output status indicates which contacts would operate if
the IED was in-service. It does not show the actual status of the output relays, as they are blocked.
3.3 TEST MODE CELL
This cell allows you to perform secondary injection testing. It also lets you test the output contacts directly by
applying menu-controlled test signals.
To go into test mode, select the Test Mode option in the Test Mode cell. This takes the IED out of service
causing an alarm condition to be recorded and the Out of Service LED to illuminate. This also freezes any
information stored in the CB CONDITION column. In IEC 60870-5-103 versions, it changes the Cause of
Transmission (COT) to Test Mode.
In Test Mode, the output contacts are still active. To disable the output contacts you must select the
Contacts Blocked
option
Once testing is complete, return the device back into service by setting the Test Mode Cell back to
Disabled.
Caution:
When the cell is in Test Mode, the Scheme Logic still drives the output relays,
which could result in tripping of circuit breakers. To avoid this, set the Test
Mode cell to Contacts Blocked.
Note:
Test mode and Contacts Blocked mode can also be selected by energising an opto-input mapped to the Test
Mode signal, and the Contact Block signal respectively.
MiCOM P747 Chapter 14 - Commissioning Instructions
P747-TM-EN-1 345
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