3-24
D30 Line Distance Protection System
GE Multilin
3.2 WIRING
3 HARDWARE
3
Lightning strikes and ground surge currents can cause large momentary voltage differences between remote ends of the
communication link. For this reason, surge protection devices are internally provided at both communication ports. An iso-
lated power supply with an optocoupled data interface also acts to reduce noise coupling. To ensure maximum reliability, all
equipment should have similar transient protection devices installed.
Terminate both ends of the RS485 circuit with an impedance as shown below.
Figure 3–24: RS485 SERIAL CONNECTION
c) 100BASE-FX FIBER OPTIC PORTS
Ensure that the dust covers are installed when the fiber is not in use. Dirty or scratched connectors can lead to high
losses on a fiber link.
The fiber optic communication ports allow for fast and efficient communications between relays at 100 Mbps. Optical fiber
can be connected to the relay supporting a wavelength of 1310 nm in multi-mode.
SCADA / PLC / computer
Optocoupler
Data
UR-series device
Shield
827757AA.CDR
Last device
Z (*)
T
Z (*) Terminating impedance at
T
each end (typically 120 Ω and 1 nF)
Twisted pair
RS485 +
RS485 –
COMP 485COM
Relay
Relay
Ground shield at SCADA / PLC /
computer
only
or at
UR-series device
only
Data
Optocoupler
Up to 32 devices,
maximum 4000 feet
(1200 m)
Z (*)
T
RS485 +
RS485 –
COMP 485COM
RS485 +
RS485 –
COMP 485COM
COM
NOTE
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...