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1MRK 505 378-UEN Rev. K
Ensure that the setting OpModePSU is set to On.
1.
Inject rated currents and voltages in all three phases. The service values IL1, IL2, IL3 and UL1,
UL2, UL3 can be monitored in the local HMI.
2.
Create a test sequence such that power swing has been detected, which can be done by
referring to steps 5, 6 and 7 described in section
ZMBURPSB
all three phases. With this condition, the output signal START will be activated.
3.
Create a phase-earth fault condition by simultaneously reducing the voltage and increasing the
current in phase L1. Ensure that the residual current (3I0) is above 20% IB and the negative
sequence current (I2) is above 12% IB. At this condition, the outputs FLTL1 and FLT1PH will be
activated. The service values STCND and RELCND will show the value as 1.
4.
Repeat the above steps by creating fault in L2 and L3 phases. The outputs FLTL2, FLT1PH
and FLTL3, FLT1PH will be activated for L2 and L3 faults respectively. The service values
STCND and RELCND will show the values 2 and 4 for L2 and L3 faults respectively.
5.
Create a power swing condition by repeating Step
by simultaneously reducing the voltages and increasing the currents in phases L1 and L2.
Ensure that the negative sequence current (I2) is above 12% IB. At this condition, the outputs
FLTL1, FLTL2 and FLT2PH will be activated. The service values STCND and RELCND will
show the value as 8.
6.
Repeat Step
outputs FLTL2, FLTL3, FLT2PH and FLTL3, FLTL1, FLT2PH will be activated for L2L3 and
L3L1 faults respectively. The service values STCND and RELCND will show the values 16 and
32 for L2L3 and L3L1 faults respectively.
7.
Create a power swing condition by repeating Step
simultaneously reducing the voltages and increasing the currents in all three phases. At this
condition, the outputs FLTL1, FLTL2, FLTL3 and FLT3PH will be activated. The service values
STCND and RELCND will show the value as 56.
11.4.9.3
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.4.10
Power swing logic PSLPSCH
Prepare the IED for verification of settings as outlined in section
"Preparing for test"
Most readily available test equipment does not permit simulation of power-swing conditions and the
simultaneous occurrence of different faults with controlled fault impedance. For this reason it is
necessary to enable the logic by connecting the STPSD input signal to some other functional signal,
which is used for testing purposes.
Make sure that the existing configuration permits monitoring of the CS, TRIP signals on the binary
outputs of the IED. If not, configure connections to unused binary outputs, for test purposes.
11.4.10.1
Function revision history
Document
revision
A
B
C
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Line differential protection RED670
Commissioning manual
and inject voltage in one of the phases accordingly by keeping constant current in
5
by creating faults between phases L2 and L3 and between L3 and L1. The
in this chapter.
Product
History
revision
2.2.1
-
2.2.1
-
2.2.2
-
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Testing functionality by secondary injection
Testing the power swing detection logic
2
and create a phase-phase fault condition
2
and create a 3-Phase fault condition by
GUID-7B491383-51C7-4078-B693-4A57AEDD9E32 v1
"Requirements"
GUID-DFB27CD5-5AC0-4D8B-B306-F74173F71E4E v1
Section 11
M14946-2 v4
and section
129
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