Bank Phase Current Unbalance Settings - GE C70 Instruction Manual
Capacitor bank protection and control system
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- Instruction manual (546 pages)
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9.4 SETTING EXAMPLE
Figure 9–13: VOLTAGE DIFFERENTIAL BLOCKING DURING VT FUSE FAILURE
The 87V-2 and 87V-3 differential elements for the strings against tap voltage are created in a similar manner. In these
cases, the K factor will be different, reflecting the voltage division of K = 463.8194 between the string and tap capacitor volt-
ages.
Two phase current unbalance (ANSI 60P) stages are used to provide trip and alarm levels during capacitor unit failures in
each differential element.
The pickup setting for the stage 1 phase current unbalance alarm element is programmed for one element failure.
9
9-18
SRC2 VT FUSE FAIL OP
OR(2)
SRC3 VT FUSE FAIL OP
OR(2)
= VTFF 87V-1 (VO1)
SRC1 VT FUSE FAIL OP
OR(2)
SRC2 VT FUSE FAIL OP
OR(2)
= VTFF 87V-2 (VO2)
SRC1 VT FUSE FAIL OP
OR(2)
SRC3 VT FUSE FAIL OP
OR(2)
= VTFF 87-3 (VO3)
60P alarm
0.9I
=
unbal f1_max
C70 Capacitor Bank Protection and Control System
9 APPLICATION OF SETTINGS
= VTFF 87V-1 (VO1)
= VTFF 87V-2 (VO2)
= VTFF 87V-3 (VO3)
843765A1.CDR
9.4.6 BANK PHASE CURRENT UNBALANCE SETTINGS
0.9 0.0209 pu
0.019 pu
=
=
(EQ 9.25)
GE Multilin
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