9.2.2 Verifying IEC communication
To verify that the IEC communication with the IEC master system is working,
there are some different methods. Choose one of the following.
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.
9.3 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 11: Max distances between IEDs/nodes
glass < 1000 m according to optical budget
plastic < 25 m (inside cubicle) according to optical budget
Figure 49: 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.
1MRK 504 088-UEN C Section 9
Establishing connection and verifying the SPA/IEC- communication
91
Installation and commissioning manual
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