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