ABB Relion 670 series - Optical Budget Calculation for Serial Communication with SPA;IEC

Local monitoring
system with
PCM600
IED IEDIED
Optical to electrical
converter, e.g. SPA-ZC 22
or Fiberdata modem
Teleph
one
modem
Teleph
one
modem
Remote monitoring
system with
PCM600
en05000672.vsd
IEC05000672 V2 EN
Figure 85: Example of SPA communication structure for a station monitoring
system
Where:
1 A separate minute pulse synchronization from station clock to obtain ± 1 ms accuracy for
time tagging within the substation might be required.
12.4 Optical budget calculation for serial communication
with SPA/IEC
Table 21: 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
Section 12 1MRK 502 029-UEN A
Establishing connection and verifying the SPA/IEC- communication
138
Installation and commissioning manual