5-136
C70 Capacitor Bank Protection and Control System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
Up to three identical neutral current unbalance elements, one per each installed CT/VT module.
The neutral current unbalance element responds to a differential current signal measured as a vectorial current difference
between neutral currents of parallel banks. In case of ungrounded banks, regular, preferably low-ratio CT can be used. In
case of grounded banks, a window or core-balance CT shall be used for increased accuracy/sensitivity.
The function applies simplified compensation for the inherent bank unbalance. Accurate compensation requires three bal-
ancing factors that are difficult to measure in practical situations. Instead, a simple and practical compensation responding
to both the positive-sequence current and negative-sequence current is applied. This method is easy to apply and remains
accurate as long as the zero-sequence bank currents are relatively small. Under large zero-sequence bank currents, the
applied method of compensation for the inherent bank unbalance is less accurate. The solution to this problem is to use a
small portion of the zero-sequence current at the bank terminals to produce extra restraint and preserve high sensitivity of
this protection method.
By setting both the slope and the inherent unbalance compensating factor to zero one could apply the function as a plain
overcurrent element responding to the split-phase neutral current.
MESSAGE
NTRL CUR UNBALCE 1
STG 2 PKP: 0.030 pu
Range: 0.001 to 5.000 pu in steps of 0.001
MESSAGE
NTRL CUR UNBALCE 1
STG 2 SLOPE: 2.0%
Range: 0.0 to 10.% in steps of 0.1
MESSAGE
NTRL CUR UNBALCE 1
STG 3 PKP: 0.040 pu
Range: 0.001 to 5.000 pu in steps of 0.001
MESSAGE
NTRL CUR UNBALCE 1
STG 3 SLOPE: 2.0%
Range: 0.0 to 10.% in steps of 0.1
MESSAGE
NTRL CUR UNBALCE 1
STG 4 PKP: 0.050 pu
Range: 0.001 to 5.000 pu in steps of 0.001
MESSAGE
NTRL CUR UNBALCE 1
STG 4 SLOPE: 5.0%
Range: 0.0 to 10.% in steps of 0.1
MESSAGE
NTRL CUR UNBALCE 1
STG 1 DEL: 30.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NTRL CUR UNBALCE 1
STG 2 DEL: 10.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NTRL CUR UNBALCE 1
STG 3 DEL: 1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NTRL CUR UNBALCE 1
STG 4 DEL: 0.20 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NTRL CUR UNBALCE 1
DPO DELAY: 0.25 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
NTRL CUR 1 BLK STG1:
Off
Range: FlexLogic™ operand
MESSAGE
NTRL CUR 1 BLK STG2:
Off
Range: FlexLogic™ operand
MESSAGE
NTRL CUR 1 BLK STG3:
Off
Range: FlexLogic™ operand
MESSAGE
NTRL CUR 1 BLK STG4:
Off
Range: FlexLogic™ operand
MESSAGE
NTRL CUR UNBALCE 1
TARGET: Self-Reset
Range: Self-reset, Latched, Disabled
MESSAGE
NTRL CUR UNBALCE 1
EVENTS: Disabled
Range: Disabled, Enabled
Содержание UR Series C70
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Страница 10: ...x C70 Capacitor Bank Protection and Control System GE Multilin TABLE OF CONTENTS ...
Страница 30: ...1 20 C70 Capacitor Bank Protection and Control System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 124: ...4 30 C70 Capacitor Bank Protection and Control System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 344: ...5 220 C70 Capacitor Bank Protection and Control System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 396: ...8 18 C70 Capacitor Bank Protection and Control System GE Multilin 8 3 ENERVISTA SECURITY MANAGEMENT SYSTEM 8 SECURITY 8 ...
Страница 414: ...9 18 C70 Capacitor Bank Protection and Control System GE Multilin 9 1 OVERVIEW 9 THEORY OF OPERATION 9 ...
Страница 436: ...10 22 C70 Capacitor Bank Protection and Control System GE Multilin 10 4 SETTING EXAMPLE 10 APPLICATION OF SETTINGS 10 ...
Страница 547: ...GE Multilin C70 Capacitor Bank Protection and Control System B 79 APPENDIX B B 4 MEMORY MAPPING B ...
Страница 548: ...B 80 C70 Capacitor Bank Protection and Control System GE Multilin B 4 MEMORY MAPPING APPENDIXB B ...
Страница 586: ...D 10 C70 Capacitor Bank Protection and Control System GE Multilin D 1 OVERVIEW APPENDIXD D ...
Страница 598: ...E 12 C70 Capacitor Bank Protection and Control System GE Multilin E 2 DNP POINT LISTS APPENDIXE E ...