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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
dynamic range available for a PMU – PDC configuration using typical OEMs.
14
12
10
8
6
4
2
0
0
IEC11000409 V1 EN-US
Figure 18:
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
62.5/125 µm
50/125 µm
0.5
1.0
1.5
2.0
2.5
FIBER OPTIC CABLE LENGTH - km
IEC11000409_1_en.vsd
Optical power budget for fiber optic cable lengths
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3.0
3.5
4.0
1MRK 504 165-UEN Rev. K
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18
shows the
Transformer protection RET670
Commissioning manual
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