ABB Relion 670 Series Application Manual page 60

Section 4
Analog and binary signal transfer for line differential protection
Type of LDCM
Minimum output
1)
power
Minimum receiver
sensitivity
Optical link
budget
1) Minimum output power is measured with 1 m of the selected fiber and the high power mode.
2) The optical budget includes a satisfactory margin for aging in transmitter and receiver during 20–30 years.
Table 12:
Type of LDCM
Type of fibre
Modem type
Typical attenuation
in fibre-optic
cables
Attenuation/
Contact
Factory splice
attenuation
Repair splices
Fiber margin for
aging
Table 13:
Type of LDCM
Type of fibre
Modem type
Maximum distance
Attenuation in
fibre-optic cables
2 contacts
Factory splice
attenuation
Repair splices
Fiber margin for
aging
Total attenuation
Optical link budget
Link margin
54
Short range (SR)
–21 dBm
–32.5 dBm
11.5 dB
2)
Example of input data for calculating the optical budget (maximum distance)
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
3 dB/km
1.5 dB/ST
0.5 dB/splice
0.3 splices/km
0.25 dB/splice
0.1 splices/km
0.1 dB/km
Example of calculating the optical budget (maximum distance)
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
2 km
6 dB
2 dB
0.3 dB
0.1 dB
0.2 dB
8.6 dB
9 dB
0.4 dB
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Short range (SR) Medium range (MR)
–13.7 dBm –3.2 dBm
–32.5 dBm –30 dBm
18.8 dB 26.8 dB
Short range (SR) Medium range (MR)
Multi-mode fiber Single-mode fiber
glass 62.5/125 μm glass 9/125 μm
1MRK0002122-AB 1MRK002311-AA
3 dB/km 0.32 dB/km
1.5 dB/ST 0.3 dB/FC/PC
0.5 dB/splice 0.08 dB/splice
0.1 splices/km 0.1 splices/km
0.25 dB/splice 0.1 dB/splice
0.1 splices/km 0.05 splices/km
0.1 dB/km 0.01 dB/km
Short range (SR) Medium range (MR)
Multi-mode fiber Single-mode fiber
glass 62.5/125 μm glass 9/125 μm
1MRK0002122-AB 1MRK002311-AA
3 km 80 km
9 dB 25.6 dB
3 dB 0.6 dB
0.45 dB 0.64 dB
0.3 dB 0.8 dB
0.3 dB 0.8 dB
12.05 dB 26.04 dB
13 dB 26.8 dB
0.95 dB 0.76 dB
Communication set-up, 670/650 series
1MRK 505 382-UEN E
Long range (LR)
–1.3 dBm
–30 dBm
28.7 dB
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
0.21 dB/km
0.3 dB/FC/PC
0.08 dB/splice
0.1 splices/km
0.1 dB/splice
0.05 splices/km
0.01 dB/km
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
120 km
25.2 dB
0.6 dB
0.96 dB
1.2 dB
1.2 dB
28.56 dB
28.7 dB
0.14 dB
Application Guide