ABB RELION REX640 Technical Manual page 1125

1MRS759142 F
Phase angle of the
compensated unbalance
current (degrees)
-45...-75
-75...-105
-105...-135
-135...-165
-165...-180
+165...+180
+135...+165
+105...+135
+75...+105
+45...+75
+15...+45
After
based on the magnitude of the unbalance current. If I_AMPL_COMP is less than
1.5 times the set
I_AMPL_COMP is between 1.5 and 2.5 times the set
incremented by two and so on.
The counter values COUNT_BR1_A, COUNT_BR2_A, COUNT_BR1_B, COUNT_BR2_B,
COUNT_BR1_C and COUNT_BR2_C are available in the monitoring data view.
The total number of element failures in double-Y-connected capacitor banks,
FAIL_COUNT, is available in the monitored data view.
The ALARM output is activated, when the value of FAIL_COUNT exceeds the setting
Element failure limit .
The counter values can be reset via
Clear menu.
REX640
Technical Manual
Alarm delay time has elapsed, the corresponding counter value is incremented
Alarm value , the counter is incremented by one. Furthermore, if
Normally, the setting
value of the unbalance current which is caused by one faulty element.
This setting value has to be chosen carefully because a slightly lower
value may lead to a situation where the counters show more failures than
the actual. Too high setting leads to a situation where a fault is not
detected.
Phase and branch of the
element failure
Phase-C branch 1
Phase-C branch 1
Phase-B branch 2
Phase-C branch 1
Phase-B branch 2
Phase-B branch 2
Phase-A branch 1
Phase-A branch 1
Phase-A branch 1
Phase-C branch 2
Phase-A branch 1
Phase-C branch 2
Phase-C branch 2
Phase-B branch 1
Phase-B branch 1
Phase-A branch 2
Phase-B branch 1
Alarm value is about 0.1 percent lower than the
CUBPTOC counters which is located under the
Protection functions
Counters to be incremented
COUNT_BR1_C
COUNT_BR1_C
COUNT_BR2_B
COUNT_BR1_C
COUNT_BR2_B
COUNT_BR2_B
COUNT_BR1_A
COUNT_BR1_A
COUNT_BR1_A
COUNT_BR2_C
COUNT_BR1_A
COUNT_BR2_C
COUNT_BR2_C
COUNT_BR1_B
COUNT_BR1_B
COUNT_BR2_A
COUNT_BR1_B
Alarm value , the counter is
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