ABB RELION REX640 Technical Manual page 1031

1MRS759142 C
REX640
Technical Manual
For an external fuse capacitor bank, the element failure location and corresponding
counters to be incremented are determined based on the phase angle of the
compensated unbalance current.
Table 963: 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 capacitor bank is fuseless, then the setting Fuse location should
be set to "External" and
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 964: 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
-45...-75
Table continues on next page
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 963 can be used to determine the
Phase and branch of the element
failure
Phase-A branch 2
Phase-A branch 2
Phase-C branch 1
Phase-C branch 1
Section 4
Protection functions
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
Counters to be incremented
COUNT_BR2_A
COUNT_BR2_A
COUNT_BR1_C
COUNT_BR1_C
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