ABB RED670 Relion 670 series, Commissioning Manual

Page: 224 / 308

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 107)
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 .
11.9.2.4 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 ).
11.9.2.5 Checking the operation of the du/dt and di/dt based function
M1405-96 v11
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< .
Section 11
1MRK 505 378-UEN A
Testing functionality by secondary injection
218 Line differential protection RED670 2.2 IEC
Commissioning manual