10-18
C70 Capacitor Bank Protection and Control System
GE Multilin
10.4 SETTING EXAMPLE
10 APPLICATION OF SETTINGS
10
Figure 10–13: 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.
10.4.6 BANK PHASE CURRENT UNBALANCE SETTINGS
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.
(EQ 10.24)
SRC2 VT FUSE FAIL OP
SRC3 VT FUSE FAIL OP
OR(2)
= VTFF 87V-1 (VO1)
SRC1 VT FUSE FAIL OP
SRC2 VT FUSE FAIL OP
OR(2)
= VTFF 87V-2 (VO2)
SRC1 VT FUSE FAIL OP
SRC3 VT FUSE FAIL OP
OR(2)
= VTFF 87-3 (VO3)
OR(2)
OR(2)
OR(2)
= VTFF 87V-1 (VO1)
= VTFF 87V-2 (VO2)
= VTFF 87V-3 (VO3)
843765A1.CDR
60P alarm
0.9
I
unbal f1_max
(
)
0.9
0.0209 pu
×
0.019 pu
=
=
=
Summary of Contents for UR Series C70
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Page 10: ...x C70 Capacitor Bank Protection and Control System GE Multilin TABLE OF CONTENTS ...
Page 344: ...5 220 C70 Capacitor Bank Protection and Control System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 586: ...D 10 C70 Capacitor Bank Protection and Control System GE Multilin D 1 OVERVIEW APPENDIXD D ...