Hitachi Relion 670 Series Commissioning Manual page 132

Section 11
Testing functionality by secondary injection
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 V equal to base voltage (VBase) 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 VBase no PICKUP signal should be activated.
3. With reduced amplitude of the injected voltage to 0.8 VBase 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 VBase the PICKUP signal should be activated.
4. With reduced amplitude of the injected voltage to 0.8 VBase 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 VBase the PICKUP 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 VBase 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 VBase the PICKUP 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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1MRK506371-UUS Rev. M
Line distance protection REL670
Commissioning manual