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5-164
C70 Capacitor Bank Protection and Control System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
Up to three identical phase current unbalance elements, one per each CT/VT module configured in hardware, are provided.
The element responds to a differential current signal measured via window-type CTs as a vectorial current difference
between two parallel banks. With the two capacitors in the same phase identical, the said differential current is zero. Small
differences between the capacitors of a given phase result in a small circulating current. Subtracting an adequate portion of
the total bank current in a given phase compensates for this inherent unbalance current.
The relay allows manual setting of the inherent unbalance factors, or automatically via the
COMMANDS
menu. For more
information, refer to the
Theory of Operation
and
Application of Settings
chapters.
Figure 5–63: PHASE CURRENT UNBALANCE BASIC CONNECTIONS
The following settings are available for all three elements.
MESSAGE
CUR UNBALCE 1 STG 4
PKP DELAY: 0.20 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
CUR UNBALCE 1
DPO DELAY: 0.25 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
CUR UNBL 1 BLK STG1:
Off
Range: FlexLogic operand
MESSAGE
CUR UNBL 1 BLK STG2:
Off
Range: FlexLogic operand
MESSAGE
CUR UNBL 1 BLK STG3:
Off
Range: FlexLogic operand
MESSAGE
CUR UNBL 1 BLK STG4:
Off
Range: FlexLogic operand
MESSAGE
CUR UNBALCE 1
TARGET: Self-Reset
Range: Self-reset, Latched, Disabled
MESSAGE
CUR UNBALCE 1
EVENTS: Disabled
Range: Disabled, Enabled
C70 CAPACITOR BANK RELAY
60P
BANK
SOURCE
Phase
CT bank
Grounding method not
relevant, neutral points
must be connected together
DIF
SOURCE
Window / core-
balance CTs
Phase
CT bank
8347516A1.CDR
Summary of Contents for C70
Page 10: ...x C70 Capacitor Bank Protection and Control System GE Multilin TABLE OF CONTENTS ...
Page 394: ...5 270 C70 Capacitor Bank Protection and Control System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 676: ...E 10 C70 Capacitor Bank Protection and Control System GE Multilin E 1 OVERVIEW APPENDIX E E ...
Page 698: ...H 8 C70 Capacitor Bank Protection and Control System GE Multilin H 3 WARRANTY APPENDIX H H ...