Measuring The Trip Limit Of Set Values - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
Ensure that the maximum continuous current, supplied from the current source used for the test
of the IED, does not exceed four times the rated current value of the IED.
10.5.1.1

Measuring the trip limit of set values

1. Inject a phase current into the IED with an initial value below that of the setting.
2. Set the operation mode to
3. Increase the injected current in the Ln phase until the TR_A (TR_B or TR_C) signal appears.
4. Switch the fault current off.
5. Compare the measured operating current with the set value.
6. Set the operation mode to
operation.
10.5.1.2 Completing the test
Continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
10.5.2 Four step phase overcurrent protection 3-phase output
OC4PTOC (51_67)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
10.5.2.1 Verifying the settings
1. Connect the test set for current injection to the appropriate IED phases.
If there is any configuration logic that is used to enable or block any of the four available
overcurrent steps, make sure that the step under test is enabled (for example, end fault
protection).
1 out of 3 currents for operation is chosen: Connect the injection current to phases A and
If
neutral.
2 out of 3 currents for operation is chosen: Connect the injection current into phase A and
If
out from phase B.
138
1 out of 3 .
Observe: Do not exceed the maximum permitted overloading of the current
circuits in the IED.
2 out of 3 and inject current into one of the phases. Check - no
in this chapter.
Verification of the non-directional phase overcurrent function is done as instructed
below, without applying any polarizing voltage.
1MRK 504 154-UUS B
TestMode setting to Disabled .
"Requirements" and
Commissioning manual
M11754-11 v6
M11754-24 v5
SEMOD56287-67 v7
SEMOD56287-72 v9