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About this chapter Chapter 9
Establishing connection and
verifying the LON communication
Figure 24: Example of LON communication structure for a substation automation system.
An optical network can be used within the Substation Automation system. This enables commu-
nication with the 670IEDs through the LON bus from the operator’s workplace, from the control
center and also from other IEDs via bay-to-bay horizontal communication.
The fiber optic LON bus is implemented using either glass core or plastic core fiber optic cables.
Table 9: Specification of the fiber optic connectors
Glass fiber Plastic fiber
Cable connector ST-connector snap-in connector
Cable diameter 62.5/125 m 1 mm
Max. cable length 1000 m 10 m
Wavelength 820-900 nm 660 nm
Transmitted power -13 dBm (HFBR-1414) -13 dBm (HFBR-1521)
Receiver sensitivity -24 dBm (HFBR-2412) -20 dBm (HFBR-2521)
Control Center
IED670 IED670IED670
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
en05000663.vsd
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