Hitachi RED670 - Optical Budget Calculation for PMU - PDC Communication

9.6 Optical budget calculation for PMU - PDC
communication
GUID-F5DEACB1-4B83-4C68-B59A-694CAC78AF3D v3
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
18 shows the
dynamic range available for a PMU – PDC configuration using typical OEMs.
14
12
10
8
6
4
2
0
0
0.5 1.0
1.5
2.0
2.5
3.0 3.5 4.0
62.5/125 µm
50/125 µm
O
P
B
–
O
P
T
I
C
A
L
P
O
W
E
R
B
U
D
G
E
T
-
d
B
FIBER OPTIC CABLE LENGTH - km
IEC11000409_1_en.vsd
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.
Section 9 1MRK 505 378-UEN Rev. K
Establishing connection and verifying the IEEE C37.118/1344 communication
78 Line differential protection RED670
Commissioning manual
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