Optical Budget Calculation For Pmu - Pdc Communication - ABB Relion 670 Series Commissioning Manual

Section 9
Establishing connection and verifying the IEEE C37.118/1344 communication
9.6 Optical budget calculation for PMU - PDC
communication
Most of the times, the PMU IEDs are located in the substations. A local PDC might be located in
the substation. For communications within the substation or between the IED and the
WAN/LAN access point, it is important to know what is the optical budget available. The graph
in Figure
OEMs.
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12
10
8
6
4
2
0
0
IEC11000409 V1 EN-US
Figure 18: Optical power budget for fiber optic cable lengths
As shown in the graph, if one uses a 62.5/125 µm fiber, the value under the 62.5/125 µm curve
represents the remaining optical budget at any link length, which is available for overcoming
non-fiber cable related losses.
Losses in the connectors and splices are typically 0.3dB/connection. The user must reserve
3dB spare for the uncertainty of the measurements.
78
18 shows the dynamic range available for a PMU – PDC configuration using typical
62.5/125 µm
50/125 µm
0.5 1.0 1.5 2.0 2.5
FIBER OPTIC CABLE LENGTH - km
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