3.3 Commissioning
307
7SD610 Manual
C53000-G1176-C145-4
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 commands, 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 apply-
ing, 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 connections were made wrong.
Before energizing the object to be protected 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 margin heading may be skipped.
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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