11.4.11 Pole slip protection PSPPPAM
SEMOD175096-3 v2
Prepare the IED for verification of settings as outlined in section "Requirements"
and section "Preparing for test" in this chapter.
11.4.11.1
Verifying the settings
SEMOD175096-7 v3
It is assumed that setting of the pole slip protection function PSPPPAM is done
according to impedances as seen in figure
38 and figure 39.
The test is done by means of injection of three-phase current and three-phase
voltage from a modern test device. This test device shall be able to give voltage
and current with the possibility to change voltage and current amplitude and the
angle between the injected voltage and current. The parameter setting shall be
according to the real application chosen values.
Procedure
1. Feed the IED with current and voltage corresponding to a normal operation
point
Injected voltage U equal to base voltage (UBase
) and the injected current I
equal to half the base current (IBase). The angle between the voltage and
current shall be 0°.
2. With maintained amplitude of the injected voltage the current amplitude and
angle is changed to a value ZC/2.
This is done with a speed so that the final impedance is reached after 1
second. As the injected voltage is higher than 0.92 UBase no START signal
should be activated.
3. With reduced amplitude of the injected voltage to 0.8 UBase the current
amplitude and angle is changed to a value ZC/2.
This is done with a speed so that the final impedance is reached after 1
second. As the injected voltage is lower than 0.92 UBase the START signal
should be activated.
4. With reduced amplitude of the injected voltage to 0.8 UBase the current
amplitude and angle is changed via ZC/2 to a value corresponding to half
IBase and 180° between the injected current and voltage.
This is done with a speed so that the final impedance is reached after 1
second. As the injected voltage is lower than 0.92 UBase the START signal
should be activated. In addition to this the signal ZONE1 should be activated.
5. Set N1Limit to 1 and repeat step
4.
Now the signals TRIP1 and TRIP should be activated.
6. W
ith reduced amplitude of the injected voltage to 0.8 UBase the current
amplitude and angle is changed via ZC + (ZA – ZC)/2 to a value
corresponding to half IBase and 180° between the injected current and
voltage.
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 147
Commissioning manual
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