Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
271
External Initiation Conditions
If the breaker failure protection can be started by external protection devices, the external start conditions must
be checked. Therefore, check first how the parameters of the breaker failure protection are set. See Section
2.6.2, addresses
3901
onwards.
In order for the breaker failure protection to be started, a current must flow at least via the monitored phase and
ground. This may be a secondary injected current.
After every start, the message
„50BF Start“
(FNo 1461) must appear in the spontaneous or fault annunci-
ations.
For three-pole starting:
• Three-pole starting by trip command of the external protection:
Binary input functions
„>50BF Start 3p“
and, if necessary,
„>50BF release“
(in or spontaneous or
fault messages). Trip command (dependent on settings).
Switch off test current.
If start is possible without current flow:
• Starting by trip command of the external protection without current flow:
Binary input functions
„>50BF STARTw/oI“
and, if necessary,
„>50BF release“
(in or spontaneous or
fault messages). Trip command (dependent on settings).
Busbar Tripping
For testing the distribution of the trip commands in the substation in the case of breaker failures it is important
to check that the trip commands to the adjacent circuit breakers are correct.
The adjacent circuit breakers are those of all feeders which must be tripped in order to ensure interruption of
the fault current should the local breaker fail. These are therefore the circuit breakers of all feeders which feed
the busbar or busbar section to which the feeder with the fault is connected.
A general detailed test guide cannot be specified because the layout of the adjacent circuit breakers largely
depends on the system topology.
In particular with multiple busbars, the trip distribution logic for the adjacent circuit breakers must be checked.
Here it should be checked for every busbar section that all circuit breakers which are connected to the same
busbar section as the feeder circuit breaker under observation are tripped, and no other breakers.
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 Pilot Protection Scheme
with ...“ further below.
Termination
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.
