13. 13. Repeat step 14 and 15 using OPENCMD instead of CLOSECMD.
Asymmetry current detection with CB monitoring: Set all three currents to
110% of Current Release level. Activate CLOSECMD.
NO TRIP signal should appear due to symmetrical condition.
14. 14. Deactivate the CLOSECMD. Decrease one current with 120% of the
current unsymmetrical level compared to the other two phases. Activate
CLOSECMD and measure the operating time of the CCRPLD protection.
Use the TRIP signal from the configured binary out put stop the timer.
15. 15. Deactivate the CLOSECMD. Decrease one current with 80% of the
current unsymmetrical level compared to the other two phases. Activate
CLOSECMD.
NO TRIP signal should appear.
15.6.9.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
15.6.10 Directional underpower protection GUPPDUP
Prepare the IED for verification of settings outlined in section
"Overview" and
section "Preparing for test" in this chapter.
15.6.10.1 Verifying the settings
The underpower protection shall be set to values according to the real set values to
be used.
The test is made by means of injection of voltage and current where the amplitude
of both current and voltage and the phase angle between the voltage and current
can be controlled. During the test the analog outputs of active and reactive power
shall be monitored.
1. Connect the test set for injection of voltage and current corresponding to the
mode to be used in the application. If a three-phase test set is available this
could be used for all the modes. If a single-phase current/voltage test set is
available the test set should be connected to a selected input for one-phase
current and voltage.
Section 15 1MRK 502 029-UEN A
Verifying settings by secondary injection
186
Installation and commissioning manual
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