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Section 11
Testing functionality by secondary injection
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.
With 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.
This is done with a speed so that the final impedance is reached after 1s. As the injected
voltage is lower than 0.92 UBase the START signal should be activated. In addition to this the
signal ZONE2 should be activated.
7.
Set N2Limit to 1 and repeat step 6.
Now the signals TRIP2 and TRIP should be activated.
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1MRK 505 378-UEN Rev. K
Line differential protection RED670
Commissioning manual
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