ABB RELION REX640 Technical Manual page 1124

Protection functions
Table 1066: Element failure location and counters to be incremented for external
fuse case
Phase angle of the
compensated unbalance
current (degrees)
-15...+15
-15...-45
-45...-75
-75...-105
-105...-135
-135...-165
-165...-180
+165...+180
+135...+165
+105...+135
+75...+105
+45...+75
+15...+45
If the compensated unbalance current I_AMPL_COMP is greater than three times the
set
fuse and blown fuse cases, the element failure location and corresponding counters
to be incremented are determined based on the phase angle of the compensated
unbalance current.
Table 1067: Element failure location and counters to be incremented for internal
fuse and blown fuse case
Phase angle of the
compensated unbalance
current (degrees)
-15...+15
-15... -45
Table continues on the next page
1124
If the capacitor bank is fuseless, then the setting
set to "External" and
failure location.
Alarm value , it is considered to be a case of blown external fuse. For the internal
Phase and branch of the
element failure
Phase-A branch 1
Phase-A branch 1
Phase-C branch 2
Phase-C branch 2
Phase-B branch 1
Phase-C branch 2
Phase-B branch 1
Phase-B branch 1
Phase-A branch 2
Phase-A branch 2
Phase-A branch2
Phase-C branch 1
Phase-A branch 2
Phase-C branch 1
Phase-C branch1
Phase-B branch2
Phase-B branch2
Phase-A branch1
Phase-B branch2
Table 1066
can be used to determine the element
Phase and branch of the
element failure
Phase-A branch 2
Phase-A branch 2
1MRS759142 F
Counters to be incremented
COUNT_BR1_A
COUNT_BR1_A
COUNT_BR2_C
COUNT_BR2_C
COUNT_BR1_B
COUNT_BR2_C
COUNT_BR1_B
COUNT_BR1_B
COUNT_BR2_A
COUNT_BR2_A
COUNT_BR2_A
COUNT_BR1_C
COUNT_BR2_A
COUNT_BR1_C
COUNT_BR1_C
COUNT_BR2_B
COUNT_BR2_B
COUNT_BR1_A
COUNT_BR2_B
Fuse location should be
Counters to be incremented
COUNT_BR2_A
COUNT_BR2_A
REX640
Technical Manual