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 RET670 Commissioning Manual

1MRK 504 165-UEN A
11.5.3.1
11.5.3.2
11.5.4
11.5.4.1
Transformer protection RET670 2.2 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 the set value of
IN>> and also make sure that the set value IN>> is in between IN>>Min and
IN>>Max.
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.
Do 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
to verify settings".
Values of the logical signals for D2PTOC are available on the local HMI under
Main menu/Tests/Function status/Current protection/
ResidualOverCurr4Step(51N_67N,4(IN>))/EF4PTOC(51N_67N;4(IN>)):x,
where x = instance number.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.

Four step directional earth fault protection

1. Connect the test set for single current injection to the appropriate IED
terminals.
Section 11
SEMOD52967-11 v9
SEMOD52967-24 v5
SEMOD53296-3 v9
"Preparing the IED
SEMOD53296-208 v7
175