Testing User-Defined Functions - Siemens SIPROTEC 7SJ61 Manual

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.
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 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 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.
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.
3.3.5

Testing User-Defined Functions

CFC Logic
The device has a vast capability for allowing functions to be defined by the user, especially with the CFC logic.
Any special function or logic added to the device must be checked.
Of course, general test procedures cannot be given. Configuration of these functions and the target conditions
must be actually known beforehand and tested. Possible interlocking conditions of switching devices (circuit
breakers, disconnectors, ground switch) are of particular importance. They must be observed and tested.
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
Mounting and Commissioning
3.3 Commissioning
297