1. Use a SPA-emulator and send “RF” to the IED. The answer from the IED should be the type
and version of it, for example, “REL670 2.1...”.
2. Generate one binary event by activating a function, which is configured to an EVENT
block where the used input is set to generate events on SPA. The configuration must be
made with the PCM600 software. Verify that the event is presented in the SMS/SCS
system.
During the following tests of the different functions in the IED, verify that the events and
indications in the SMS/SCS system are as expected.
6.1.3 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 7: Max distances between IEDs/nodes
glass < 1000 m according to optical budget
plastic < 25 m (inside cubicle) according to optical budget
6.1.4 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
Section 6 1MRK 511 396-UEN E
Establishing connection and verifying the SPA/IEC communication
24 SPA, 670 series
Communication protocol manual
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