ABB RELION 650 SERIES, Commissioning Manual, Page: 84 / 128

5. Repeat steps 1 and 2 . Then slowly increase the measured current in one phase until the
BLKU signal disappears.
6. Record the measured current and calculate the corresponding zero-sequence current
according to the equation (observe that the currents in the equation are phasors):
0 L1 L2 L3
3 = I I I I
× + +
IECEQUATION00019 V1 EN-US
(Equation 10)
Where:
1 2 3 L L L
I I and I
,
IECEQUATION00020 V1 EN-US
are the measured phase currents
7. Compare the result with the set value of the zero-sequence operate current. Consider
that the set value
3I0< is in percentage of the base current IBase.
9.5.2.4 Measuring the operate value for the dead line detection function
GUID-4ABF1FD4-F6D3-4109-AFE5-552875E558A0 v4
1. Apply three-phase voltages with their rated value and zero currents.
2. Decrease the measured voltage in one phase until the DLD1PH signal appears.
3. This is the point at which the dead line condition is detected. Check the value of the
decreased voltage with the set value UDLD< (UDLD< is in percentage of the base voltage
UBase).
4. Apply three-phase currents with their rated value and zero voltages.
5. Decrease the measured current in one phase until the DLD1PH signal appears.
6. This is the point at which the dead line condition is detected. Check the value of the
decreased current with the set value IDLD< (IDLD< is in percentage of the base current
IBase).
9.5.2.5 Checking the operation of the du/dt and di/dt based function
M1405-96 v12
Check the operation of the du/dt and di/dt based function if included in the IED.
1. Simulate normal operating conditions with the three-phase currents in phase with their
corresponding phase voltages and with all of them equal to their rated values.
2. Change the voltages and currents in all three phases simultaneously.
The voltage change must be higher than the set value DU> and the current change must
be lower than the set value DI<.
• The BLKU and BLKZ signals appear without any time delay. The BLKZ signal will be
activated only if the internal deadline detection is not activated at the same time.
• 3PH should appear after 5 seconds, if the remaining voltage levels are lower than
the set UDLD< of the dead line detection function.
3. Apply normal conditions as in step 1 .
The BLKU, BLKZ and 3PH signals should reset, if activated, see step 1 and 2 .
4. Change the voltages and currents in all three phases simultaneously.
The voltage change must be higher than the set value
DU> and the current change must
be higher than the set value
DI<.
The BLKU, BLKZ and 3PH signals should not appear.
5. Repeat step 2 .
6. Connect the nominal voltages in all three phases and feed a current below the operate
level in all three phases.
7. Keep the current constant. Disconnect the voltage in all three phases simultaneously.
The BLKU, BLKZ and 3PH signals should not appear.
Section 9 1MRK 505 385-UEN C
Testing functionality by secondary injection
78 Breaker protection REQ650
Commissioning manual
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