6.1.2
Verifying the communication
M11735-77 v1
To verify that the rear communication with the SMS/SCS system is working, there
are some different methods. Choose one of the following.
6.1.2.1
Verifying SPA communication
M11735-81 v5
Procedure
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, “REL650 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
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
6.1.4
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
-
Table continues on next page
Section 6
1MRK 511 418-UEN A
Establishing connection and verifying the SPA/IEC communication
26
650 series 2.2 IEC
Communication protocol manual
