GE Multilin
F60 Feeder Protection System
5-197
5 SETTINGS
5.6 GROUPED ELEMENTS
5
Figure 5–81: GROUND IOC1 SCHEME LOGIC
e) RESTRICTED GROUND FAULT (ANSI 87RGF, IEC PNDF)
PATH: SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
GROUND CURRENT
RESTRICTED GROUND FAULT 1(6)
Restricted ground fault (RGF) protection provides sensitive ground fault detection for low-magnitude fault currents, primar-
ily faults close to the neutral point of a wye-connected winding. An internal ground fault on an impedance grounded wye
winding will produce a fault current dependent on the ground impedance value and the fault position on the winding with
respect to the neutral point. The resultant primary current will be negligible for faults on the lower 30% of the winding since
the fault voltage is not the system voltage, but rather the result of the transformation ratio between the primary windings
and the percentage of shorted turns on the secondary. Therefore, the resultant differential currents may be below the slope
threshold of the main differential element and the fault could go undetected. Application of the restricted ground fault pro-
tection extends the coverage towards the neutral point (see the
RGF and Percent Differential Zones of Protection
diagram).
RESTRICTED GROUND
FAULT 1
RESTD GND FT1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
RESTD GND FT1
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
RESTD GND FT1
PICKUP: 0.080
pu
Range: 0.005 to 30.000 pu in steps of 0.001
MESSAGE
RESTD GND FT1
SLOPE: 40%
Range: 0 to 100% in steps of 1
MESSAGE
RESTD GND FT1 PICKUP
DELAY: 0.10
s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
RESTD GND FT1 RESET
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
RESTD GND FT1 BLOCK:
Off
Range: FlexLogic operand
MESSAGE
RESTD GND FT1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
RESTD GND FT1
EVENTS: Disabled
Range: Disabled, Enabled
SETTING
GROUND IOC1
FUNCTION:
Enabled = 1
SETTING
GROUND IOC1
SOURCE:
IG
GROUND IOC1
BLOCK:
Off = 0
FLEXLOGIC OPERANDS
GROUND IOIC DPO
GROUND IOC1 OP
SETTING
SETTING
IG
PICKUP
GROUND IOC1
PICKUP:
RUN
GROUND IOC1 PICKUP
DELAY:
SETTINGS
GROUND IOC1 RESET
DELAY:
t
PKP
t
RST
827037A5.VSD
AND
GROUND IOC1 PKP
Summary of Contents for F60
Page 10: ...x F60 Feeder Protection System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 F60 Feeder Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 138: ...4 28 F60 Feeder Protection System GE Multilin 4 2 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 454: ...5 316 F60 Feeder Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 500: ...7 14 F60 Feeder Protection System GE Multilin 7 1 COMMANDS 7 COMMANDS AND TARGETS 7 ...
Page 508: ...8 8 F60 Feeder Protection System GE Multilin 8 2 FAULT LOCATOR 8 THEORY OF OPERATION 8 ...
Page 522: ...10 12 F60 Feeder Protection System GE Multilin 10 6 DISPOSAL 10 MAINTENANCE 10 ...
Page 660: ...B 116 F60 Feeder Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 706: ...E 10 F60 Feeder Protection System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Page 718: ...F 12 F60 Feeder Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Page 728: ...H 8 F60 Feeder Protection System GE Multilin H 2 ABBREVIATIONS APPENDIX H H Z Impedance Zone ...
Page 730: ...H 10 F60 Feeder Protection System GE Multilin H 3 WARRANTY APPENDIX H H ...