During the following tests of the different functions in the IED, verify that the
events and indications in the IEC master system are as expected.
6.3
Fiber optic loop
M11905-3 v7
The SPA communication is mainly used for SMS. It can include different
numerical IEDs with remote communication possibilities. The fiber optic loop can
contain < 20-30 IEDs depending on requirements on response time. Connection to
a personal computer (PC) can be made directly (if the PC is located in the
substation) or by telephone modem through a telephone network with ITU
(CCITT) characteristics.
Table 11:
Max distances between IEDs/nodes
glass
< 1000 m according to optical budget
plastic
< 25 m (inside cubicle) according to optical budget
6.4
Optical budget calculation for serial communication
with SPA/IEC
M11736-4 v2
Table 12:
Example
Distance 1 km
Glass
Distance 25 m
Plastic
Maximum attenuation
- 11 dB
- 7 dB
4 dB/km multi mode: 820 nm - 62.5/125 um
4 dB
-
0.16 dB/m plastic: 620 nm - 1mm
-
4 dB
Margins for installation, aging, and so on
5 dB
1 dB
Losses in connection box, two contacts (0.5 dB/contact)
1 dB
-
Losses in connection box, two contacts (1 dB/contact)
-
2 dB
Margin for 2 repair splices (0.5 dB/splice)
1 dB
-
Maximum total attenuation
11 dB
7 dB
1MRK 506 377-UEN C
Section 6
Establishing connection and verifying the SPA/IEC communication
Railway application RER670 2.2 IEC
51
Commissioning manual
Summary of Contents for RELION RER670
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