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Current protection Chapter 11
Verifying settings by secondary
injection
13. Repeat point 11 and 12 using OPENCMD instead of CLOSECMD. Un-
symmetry current detection with CB monitoring: Set all three cur-
rents to 110% of Current Release level. Activate CLOSECMD.
NO TRIP signal should appear due to symmetrical condition.
14. Deactivate the CLOSECMD. Decrease one current with 120% of the
Current Unsymmetry level compared to the other two phases. Acti-
vate CLOSECMD and measure the operating time of the PD protec-
tion.
Use the TRIP signal from the configured binary out put stop the timer.
15. Deactivate the CLOSECMD. Decrease one current with 80% of the
Current Unsymmetry level compared to the other two phases. Acti-
vate CLOSECMD.
NO TRIP signal should appear.
16. Continue to test another function or complete the test by setting the
test mode to off.
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