Mal-Operation Of The Relay During Testing; Failure Of Output Contacts; Failure Of Opto-Isolated Inputs - GE MiCOM P40 Agile Technical Manual

P44x/EN TS/Hb6
(TS) 11-12
7

MAL-OPERATION OF THE RELAY DURING TESTING

7.1

Failure of output contacts

An apparent failure of the relay output contacts may be caused by the relay configuration;
the following tests should be performed to identify the real cause of the failure. Note that the
relay self-tests verify that the coil of the contact has been energized, an error will be
displayed if there is a fault in the output relay board.
Test
1
2
3
4
Table 6: Failure of output contacts
7.2

Failure of opto-isolated inputs

The opto-isolated inputs are mapped onto the relay internal signals using the programmable
scheme logic. If an input does not appear to be recognized by the relay scheme logic the
Commission Tests/Opto Status menu option can be used to verify whether the problem is in
the opto-isolated input itself or the mapping of its signal to the scheme logic functions. If the
opto-isolated input does appear to be read correctly then it will be necessary to examine its
mapping within the programmable logic.
Ensure the voltage rating for the opto inputs has been configured correctly with applied
voltage. If the opto-isolated input state is not being correctly read by the relay the applied
signal should be tested. Verify the connections to the opto-isolated input using the correct
wiring diagram. Next, using a voltmeter verify that 80% opto setting voltage is present on the
terminals of the opto-isolated input in the energized state. If the signal is being correctly
applied to the relay then the failure may be on the input card itself. Depending on which
opto-isolated input has failed this may require replacement of either the complete analog
input module (the board within this module cannot be individually replaced without re-
calibration of the relay) or a separate opto board.
Check
Is the Out of Service LED
illuminated?
Examine the Contact status in
the Commissioning section of
the menu.
Verify by examination of the
fault record or by using the test
port whether the protection
element is operating correctly.
Using the Commissioning/Test
mode function apply a test
pattern to the relevant relay
output contacts and verify
whether they operate (note the
correct external connection
diagram should be consulted).
A continuity tester can be used
at the rear of the relay for this
purpose.
MiCOM P40 Agile P442, P444
Action
Illumination of this LED may indicate that the relay is
in test mode or that the protection has been disabled
due to a hardware verify error (see Table 4).
If the relevant bits of the contact status are operated
then proceed to test 4, if not proceed to test 3.
If the protection element does not operate verify
whether the test is being correctly applied.
If the protection element does operate then it will be
necessary to check the programmable logic, to ensure
that the mapping of the protection element to the
contacts is correct.
If the output relay does operate then the problem
must be in the external wiring to the relay. If the
output relay does not operate this could indicate a
failure of the output relay contacts (note that the self-
tests verify that the relay coil is being energized).
Ensure that the closed resistance is not too high for
the continuity tester to detect.
Troubleshooting