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
Fibre optic loop
M11905-3 v6
The SPA communication is mainly used for SMS. It can include different
numerical IEDs with remote communication possibilities. The fibre 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 station)
or by telephone modem through a telephone network with ITU (CCITT)
characteristics.
Table 7:
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 8:
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 506 383-UEN A
Section 6
Establishing connection and verifying the SPA/IEC communication
Line distance protection REL650 2.2 IEC
51
Commissioning manual
Summary of Contents for REL650 series
Page 1: ...RELION 650 SERIES Line distance protection REL650 Version 2 2 Commissioning manual...
Page 2: ......
Page 24: ...18...
Page 28: ...22...
Page 38: ...32...
Page 54: ...48...
Page 58: ...52...
Page 178: ...172...
Page 182: ...176...
Page 188: ...182...
Page 196: ...190...
Page 206: ...200...
Page 207: ...201...