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11 Commissioning Instructions
2
COMMISSIONING
The P253 is fully numerical in its design. It has a self-supervision function which continuously keeps
track of its internal hardware and will display a message on the LCD screen if it detects the failure of
any component. Therefore, the commissioning tests are less extensive than those for non-numeric
electronic devices or electromechanical relays.
2.1
Commissioning Test Menu
The IED provides several test facilities under the COMMISSION TEST menu heading. There are
menu cells that allow you to monitor the status of the opto-inputs, output relay contacts, and user-
programmable LEDs.
This section describes the commissioning tests available in the IED's Commissioning test menu.
2.1.1
Test Mode
The Test Mode menu cell is used to allow secondary injection testing to be performed on the relay
itself without operation of the trip contacts. It also enables a facility to test the output contacts by
applying menu controlled test signals.
To select test mode, the Test Mode menu cell should be set to Test Mode. This takes the relay out of
service and blocks the maintenance counters. It also causes an alarm condition to be recorded and
the amber OUT OF SERVICE LED to illuminate. This action freezes any information stored in the CB
Condition column and in IEC 60870-5-103 builds changes the Cause of Transmission (COT) to Test
Mode.
To enable testing of output contacts the Test Mode cell should be set to Contacts Blocked. This
blocks the protection from operating the contacts and enables the test pattern and contact test
functions which can be used to manually operate the output contacts.
When testing is complete the cell must be set back to Disabled to restore the relay back to service.
2.1.2
Test Pattern
This cell is used to select the output relay contacts that will be tested when the Contact Test cell is set
to Apply Test.
2.1.3
Contact Test
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.
2.1.4
Test LEDs
When the Apply Test command in this cell is issued, the 4 programmable LEDs will illuminate for
approximately 2 seconds before they extinguish and the command text on the LCD reverts to No
Operation.
2.1.5
Opto Input Status Check
The Opto I/P cell under SYSTEM DATA menu can be used to monitor the status of the opto-inputs
while they are sequentially energised with a suitable voltage. The cell is a binary string that displays
the status of the opto-inputs where '1' means energised and '0' means de-energised.
11-4
P50 Agile P253
P253/EN M/C
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