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3 Mounting and Commissioning
Busbar Tripping
Tripping of the
Remote End
Termination
3.3.5
Checking User-Defined Functions
CFC Logic
3.3.6
Current, Voltage, and Phase Rotation Testing
≥ 10 % of Load
Current
427
If start is possible without current flow:
• Closing the circuit breaker to be monitored to both sides with the disconnector
switches open.
• Start by trip command of the external protection: Binary input functions „>50BF
ext SRC" (FNo 1431) (in spontaneous or fault annunciations).
• After every start, the message „50BF ext Pickup" (FNo 1457) must appear in
the spontaneous or fault annunciations.
• After time expiration TRIP-Timer (address 7005) tripping command of the circuit
breaker failure protection.
Open the circuit breaker again.
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 is 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 there-
fore 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.
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.
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.
The device has a vast capability for allowing functions to be defined by the user, es-
pecially with the CFC logic. Any special function or logic added to the device must be
checked.
A general procedure cannot in the nature of things be specified. Configuration of these
functions and the set value conditions must be actually known beforehand and tested.
Possible interlocking conditions of switching devices (circuit breakers, disconnectors,
earth switch) are of particular importance. They must be considered and tested.
The connections of the current and voltage transformers are tested using primary
quantities. Secondary load current of at least 10 % of the nominal current of the device
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
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