GE Multilin
D30 Line Distance Protection System
5-125
5 SETTINGS
5.6 GROUPED ELEMENTS
5
5.6.4 DISTANCE
a) MAIN MENU
PATH: SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
DISTANCE
Four common settings are available for distance protection. The
DISTANCE SOURCE
identifies the signal source for all dis-
tance functions. The mho distance functions use a dynamic characteristic: the positive-sequence voltage – either memo-
rized or actual – is used as a polarizing signal. The memory voltage is also used by the built-in directional supervising
functions applied for both the mho and quad characteristics.
The
MEMORY DURATION
setting specifies the length of time a memorized positive-sequence voltage should be used in the
distance calculations. After this interval expires, the relay checks the magnitude of the actual positive-sequence voltage. If
it is higher than 10% of the nominal, the actual voltage is used, if lower then the memory voltage continues to be used.
The memory is established when the positive-sequence voltage stays above 80% of its nominal value for five power system
cycles. For this reason it is important to ensure that the nominal secondary voltage of the VT is entered correctly under the
SETTINGS
SYSTEM SETUP
AC INPUTS
VOLTAGE BANK
menu.
Set
MEMORY DURATION
long enough to ensure stability on close-in reverse three-phase faults. For this purpose, the maxi-
mum fault clearing time (breaker fail time) in the substation should be considered. On the other hand, the
MEMORY DURA-
TION
cannot be too long as the power system may experience power swing conditions rotating the voltage and current
phasors slowly while the memory voltage is static, as frozen at the beginning of the fault. Keeping the memory in effect for
too long may eventually lead to incorrect operation of the distance functions.
DISTANCE
DISTANCE
SOURCE: SRC 1
Range: SRC 1, SRC 2
MESSAGE
MEMORY
DURATION: 10 cycles
Range: 5 to 25 cycles in steps of 1
MESSAGE
FORCE SELF-POLAR:
Off
Range: FlexLogic operand
MESSAGE
FORCE MEM-POLAR:
Off
Range: FlexLogic operand
MESSAGE
PHASE DISTANCE Z1
MESSAGE
PHASE DISTANCE Z2
MESSAGE
PHASE DISTANCE Z3
MESSAGE
PHASE DISTANCE Z4
MESSAGE
PHASE DISTANCE Z5
MESSAGE
GROUND DISTANCE Z1
MESSAGE
GROUND DISTANCE Z2
MESSAGE
GROUND DISTANCE Z3
MESSAGE
GROUND DISTANCE Z4
MESSAGE
GROUND DISTANCE Z5
Summary of Contents for D30D00HCHF8AH6AM6BP8BX7A
Page 10: ...x D30 Line Distance Protection System GE Multilin TABLE OF CONTENTS...
Page 374: ...5 248 D30 Line Distance Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5...
Page 398: ...6 24 D30 Line Distance Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6...
Page 410: ...7 12 D30 Line Distance Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7...
Page 444: ...9 24 D30 Line Distance Protection System GE Multilin 9 5 FAULT LOCATOR 9 THEORY OF OPERATION 9...
Page 576: ...B 102 D30 Line Distance Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B...
Page 616: ...D 10 D30 Line Distance Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D...
Page 628: ...E 12 D30 Line Distance Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E...
Page 636: ...F 8 D30 Line Distance Protection System GE Multilin F 3 WARRANTY APPENDIX F F...
Page 646: ...x D30 Line Distance Protection System GE Multilin INDEX...
