Figure 303: Standby IED Activation Process
The following sequence would occur under this scenario:
1. During the installation phase, a spare standby IED is installed in the substation. This can remain inactive,
until it is needed to replace functions in one of several bays. The device is connected to the process bus, but
does not have any subscriptions enabled.
2. If a failure occurs (in this example, bay 1), first isolate the faulty device by disabling its process bus and
station bus interfaces. You do this by turning off the attached network interfaces.
3. Retrieve the configuration that the faulty device normally uses, and load this into the standby redundant
IED.
4. Place the IED into the "Test Blocked" mode, as defined in IEC 61850-7-4 Edition Two. This allows test signals
to be injected into the network, which will check that the configuration is correct. GOOSE signals issued by
the device will be flagged as "test" so that subscribing switchgear controllers know not to trip during this
testing. In this way the protection can be tested all the way up to the switchgear control merging units
without having to operate primary circuit breakers, or by carrying out any secondary injection.
5. Take the standby IED out of "Test-Blocked" mode and activate it so that it now replaces the protection
functions that were disabled from the initial device failure.
The standby IED reduces downtime in the case of device failure, as protection functions can be restored quickly
before the faulted device is replaced.
P543i/P545i Chapter 22 - Communications
P54x1i-TM-EN-1 595
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