Measuring The Operate Limit Of Set Values; Completing The Test; Four Step Residual Overcurrent Protection, (Zero Sequence Or Negative Sequence Directionality) Ef4Ptoc; Four Step Directional Earth Fault Protection - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
10.4.3.1
10.4.3.2
10.4.4
10.4.4.1
Bay control REC670 2.1 IEC
Commissioning manual
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.

Measuring the operate limit of set values

1. Inject a phase current into the IED with an initial value below that of the setting.
2. Increase the injected current in the Ln or in the neutral (summated current input)
phase until the TRIP signal appears.
3. Switch the fault current off.
Observe to not exceed the maximum permitted overloading of the current
circuits in the IED.
4. Compare the measured operating current with the set value.

Completing the test

Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
Four step residual overcurrent protection, (Zero sequence or
negative sequence directionality) EF4PTOC
Prepare the IED for verification of settings outlined in section
verify settings".

Four step directional earth fault protection

1. Connect the test set for single current injection to the appropriate IED terminals.
Connect the injection current to terminals L1 and neutral.
2. Set the injected polarizing voltage slightly larger than the set minimum
polarizing voltage (default 5% of Ur) and set the injection current to lag the
voltage by an angle equal to the set reference characteristic angle (AngleRCA),
if the forward directional function is selected.
If reverse directional function is selected, set the injection current to lag the
polarizing voltage by an angle equal to RCA+ 180°.
3. Increase the injected current and note the value at which the studied step of the
function operates.
4. Decrease the current slowly and note the reset value.
5. If the test has been performed by injection of current in phase L1, repeat the test,
injecting current into terminals L2 and L3 with a polarizing voltage connected to
terminals L2, respectively L3.
6. Block lower set steps when testing higher set steps according to the instructions
that follow.
Section 10
"Preparing the IED to
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