Mal-Operation During Testing; Failure Of Output Contacts; Failure Of Opto-Inputs; Incorrect Analogue Signals - GE MiCOM P40 Agile Technical Manual

Chapter 21 - Maintenance and Troubleshooting
3.6

MAL-OPERATION DURING TESTING

3.6.1

FAILURE OF OUTPUT CONTACTS

An apparent failure of the relay output contacts can be caused by the configuration. Perform the following tests to
identify the real cause of the failure. The self-tests verify that the coils of the output relay contacts have been
energized. An error is displayed if there is a fault in the output relay board.
Test
1 Is the Out of Service LED ON?
Examine the Contact status in the Commissioning
2
section of the menu.
Examine the fault record or use the test port to check the
3
protection element is operating correctly.
Using the Commissioning or Test mode function, apply a
test pattern to the relevant relay output contacts.
4 Consult the correct external connection diagram and use
a continuity tester at the rear of the relay to check the
relay output contacts operate.
3.6.2

FAILURE OF OPTO-INPUTS

The opto-isolated inputs are mapped onto the IED's internal DDB signals using the programmable scheme logic. If
an input is not recognized by the scheme logic, use the Opto I/P Status cell in the COMMISSION TESTS column to
check whether the problem is in the opto-input itself, or the mapping of its signal to the scheme logic functions.
If the device does not correctly read the opto-input state, test the applied signal. Verify the connections to the
opto-input using the wiring diagram and the nominal voltage settings in the OPTO CONFIG column. To do this:
1. Select the nominal battery voltage for all opto-inputs by selecting one of the five standard ratings in the
Global Nominal V cell.
2. Select Custom to set each opto-input individually to a nominal voltage.
3. Using a voltmeter, check that the voltage on its input terminals is greater than the minimum pick-up level
(See the Technical Specifications chapter for opto pick-up levels).
If the signal is correctly applied, this indicates failure of an opto-input, in which case the complete cradle should be
replaced.
3.6.3

INCORRECT ANALOGUE SIGNALS

If the measured analogue quantities do not seem correct, use the measurement function to determine the type of
problem. The measurements can be configured in primary or secondary terms.
1. Compare the displayed measured values with the actual magnitudes at the terminals.
2. Check the correct terminals are used.
3. Check the CT and VT ratios set are correct.
4. Check the phase displacement to confirm the inputs are correctly connected.
3.7

PSL EDITOR TROUBLESHOOTING

A failure to open a connection could be due to one or more of the following:
The IED address is not valid (this address is always 1 for the front port)
●
● Password in not valid
464
Check
If this LED is ON, the relay may be in test mode or the protection has
been disabled due to a hardware verify error.
If the relevant bits of the contact status are operated, go to test 4; if not,
go to test 3.
If the protection element does not operate, check the test is correctly
applied.
If the protection element operates, check the programmable logic to
make sure the protection element is correctly mapped to the contacts.
If the output relay operates, the problem must be in the external wiring
to the relay. If the output relay does not operate the output relay
contacts may have failed (the self-tests verify that the relay coil is being
energized). Ensure the closed resistance is not too high for the continuity
tester to detect.
Action
P14D-TM-EN-8
P14D