Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
310
Tripping of the Remote End
If the trip command of the circuit breaker failure protection must also trip the circuit breaker at the remote end
of the feeder under observation, the transmission channel for this remote trip must also be checked. This is
done together with transmission of other signals according to Sections „Testing of the Teleprotection Scheme
with ...“ further below.
Termination of the Checks
All temporary measures taken for testing must be undone, e.g. especially switching states, interrupted trip com-
mands, changes to setting values or individually switched off protection functions.
3.3.7 Checking the Instrument Transformer Connections of One Line End
If secondary test equipment is connected to the device, it is to be removed or, if applying, test switches should
be in normal operation position.
Note
It must be taken into consideration that tripping can occur even at the opposite end of the protected object if
wrong connections were made.
Before energizing the protected object at one end, short-circuit protection must be ensured at least at the
feeding ends. If a separate backup protection (e.g. time overcurrent protection) is available, this has to be put
into operation and switched to alert first.
Voltage and phase rotation check
If the device has been connected to voltage transformers, these connections are checked using primary values.
For devices without voltage transformer connection, the rest of this section can be ignored.
The voltage transformer connections are individually tested at either end of the object to be protected. At the
other end, the circuit breaker initially remains open.
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