ABB REL670 Installation And Commissioning Manual page 124

116
Current protection
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.
Chapter 11
Verifying settings by secondary
injection