GE Multilin
L60 Line Phase Comparison System
8-5
8 THEORY OF OPERATION
8.1 OVERVIEW
8
Figure 8–4: THREE-TERMINAL LINE PHASE COMPARISON
Figure 8–5: SINGLE-PHASE COMPARISON BLOCKING SCHEME PRINCIPLE
It will be noted from Figure 8–5 that AND1 (the comparer) at each end of the line compares the coincidence time of the pos-
itive half cycle of current with the absence of receiver output. This is initiated only when a fault is present as indicated by an
output from FDH (Fault Detector High-set). FDH is set so that it does not pick up on load current but does pick up for all
faults on the protected line section. Thus, when a fault occurs, FDH picks up, and if the receiver output is not present for 3
milliseconds during the positive half cycle of current out of the mixing network, a trip output will be obtained.
Summary of Contents for L60
Page 10: ...x L60 Line Phase Comparison System GE Multilin TABLE OF CONTENTS ...
Page 57: ...GE Multilin L60 Line Phase Comparison System 2 27 2 PRODUCT DESCRIPTION 2 3 SPECIFICATIONS 2 ...
Page 58: ...2 28 L60 Line Phase Comparison System GE Multilin 2 3 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 482: ...6 26 L60 Line Phase Comparison System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 554: ...10 8 L60 Line Phase Comparison System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Page 674: ...B 110 L60 Line Phase Comparison System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 704: ...C 30 L60 Line Phase Comparison System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 720: ...E 10 L60 Line Phase Comparison System GE Multilin E 1 PROTOCOL APPENDIX E E ...
Page 732: ...F 12 L60 Line Phase Comparison System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Page 742: ...H 8 L60 Line Phase Comparison System GE Multilin H 3 WARRANTY APPENDIX H H ...
