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1MRK 511 366-UUS -
Establishing connection and verifying the SPA/IEC communication
6.3
6.4
Commissioning manual
Procedure
1.
Check that the master system time-out for response from the IED, for example after
a setting change, is > 40 seconds.
2.
Use a protocol analyzer and record the communication between the IED and the IEC
master. Check in the protocol analyzer's log that the IED answers the master
messages.
3.
Generate one binary event by activating a function that is configured to an event
block where the used input is set to generate events on IEC. The configuration must
be made with the PCM600 software. Verify that the event is presented in the IEC
master system.
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.
Fibre optic loop
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 substation) or by telephone modem through
a telephone network with ITU (CCITT) characteristics.
Table 8:
Max distances between IEDs/nodes
glass
< 1000 m according to optical budget
plastic
< 25 m (inside cubicle) according to optical budget
Optical budget calculation for serial communication with
SPA/IEC
Table 9:
Example
Maximum attenuation
4 dB/km multi mode: 820 nm - 62.5/125 um
0.16 dB/m plastic: 620 nm - 1mm
Margins for installation, aging, and so on
Losses in connection box, two contacts (0.5 dB/contact)
Table continues on next page
Distance 1 km
Distance 25 m
Glass
Plastic
- 11 dB
- 7 dB
4 dB
-
-
4 dB
5 dB
1 dB
1 dB
-
Section 6
57
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