GE Multilin
L60 Line Phase Comparison System
5-157
5 SETTINGS
5.5 GROUPED ELEMENTS
5
i) CHARGE CURRENT COMPENSATION
PATH: SETTINGS
GROUPED ELEMENTS
PHASE COMPARISON ELEMENTS
CHARGE CURRENT COMPENSATION
•
CHARGING CURRENT COMPENSATN
: This setting enables and disables the charging current calculations and cor-
rections of the mixed current used as an operating quantity for fault detectors and square pulses. The voltage signals
used for charging current compensation are taken from source 3 or 4 assigned with the three-phase voltage bank on
the L5 voltage bank. As such, it is critical to ensure that three-phase line voltage is assigned to this source and voltage
bank settings are entered correctly. Half (or one-third for the three-terminal line, as defined by the
87PC SCHEME
SELECT
setting) of the line charging current is subtracted from the line current.
This setting is forced to “Disabled” if a phase VT bank is not assigned at either source 3 or source 4.
The following diagram shows possible configurations.
Figure 5–59: CHARGING CURRENT COMPENSATION CONFIGURATIONS
•
CHARGE COMPENST BLOCK
: This setting selects an input to block charging current compensation. This input is
typically the VT fuse fail element of the source, where the three-phase VT is configured with this setting to block com-
pensation. Blocking charging current compensation at one end of the line does not block charging current compensa-
tion on the other end. However, even with compensation operating at one end ½ (or 1/3) of the charging current is still
removed from the net phase comparison current. Alternatively, the customer may choose to switch to another setting
group with more conservative phase comparison settings during a VT fuse fail condition.
•
POSITIVE and ZERO SEQUENCE CAPACITIVE REACTANCE:
The values of positive and zero sequence capacitive
reactance of the protected line are required for charging current compensation calculations. The line capacitive reac-
tance values should be entered in
primary kilo-ohms
for the total line length. Details of the charging current compen-
sation algorithm can be found in Chapter 8:
Theory of operation
.
If shunt reactors are also installed on the line, the resulting value entered in the
POS SEQ CAPACITIVE REACTANCE
and
ZERO SEQ CAPACITIVE REACTANCE
settings should be calculated as follows:
1.
No shunt reactors on the line or reactor current is subtracted from the line current, forcing the L60 to measure the
uncompensated by shunt reactors load/fault current plus the full charging current.
CHARGE CURRENT
COMPENSATION
CHARGE CURRENT
COMPENSATN: Disabled
Range: Disabled, Enabled
MESSAGE
CHARGE COMPENST BLK:
Off
Range: any FlexLogic operand
MESSAGE
POS SEQ CAPACITIVE
REACTANCE: 0.100 K
Range: 0.100 to 65.535 kohms in steps of 0.001
MESSAGE
ZERO SEQ CAPACITIVE
REACTANCE: 0.100 K
Range: 0.100 to 65.535 kohms in steps of 0.001
Possible 3-Reactor
arrangement
Line Capacitive Reactance
Xreact
Xreact
Xreact_n
X1line_capac
X0line_capac
Possible 4-Reactor
arrangement
A B C
A B C
831731A3.CDR
Содержание L60
Страница 10: ...x L60 Line Phase Comparison System GE Multilin TABLE OF CONTENTS ...
Страница 57: ...GE Multilin L60 Line Phase Comparison System 2 27 2 PRODUCT DESCRIPTION 2 3 SPECIFICATIONS 2 ...
Страница 58: ...2 28 L60 Line Phase Comparison System GE Multilin 2 3 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 100: ...3 42 L60 Line Phase Comparison System GE Multilin 3 3 DIRECT INPUT AND OUTPUT COMMUNICATIONS 3 HARDWARE 3 ...
Страница 482: ...6 26 L60 Line Phase Comparison System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 554: ...10 8 L60 Line Phase Comparison System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Страница 674: ...B 110 L60 Line Phase Comparison System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 704: ...C 30 L60 Line Phase Comparison System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 720: ...E 10 L60 Line Phase Comparison System GE Multilin E 1 PROTOCOL APPENDIX E E ...
Страница 732: ...F 12 L60 Line Phase Comparison System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Страница 742: ...H 8 L60 Line Phase Comparison System GE Multilin H 3 WARRANTY APPENDIX H H ...