Installation and Commissioning
8-42
7SA522 Manual
C53000-G1176-C119-2
The surrounding circuit breakers are all those which need to trip when the feeder cir-
cuit breaker fails. These are therefore the circuit breakers of all feeders which feed the
busbar or busbar section to which the feeder with the short-circuit is connected.
A general detailed test guide cannot be specified because the layout of the surround-
ing circuit breakers largely depends on the switchgear topology.
In particular with multiple busbars the trip distribution logic for the surrounding 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 section 8.3.6.5.
Termination
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.
8.3.9
Testing User-Defined Functions
7SA522 has a vast capability for allowing functions to be defined by the user, espe-
cially with the CFC logic. Any special function or logic added to the device must be
checked.
Naturally, general test procedures cannot be given. Rather, the configuration of these
user-defined functions and the necessary associated conditions must be known and
verified. Of particular importance are possible interlocking conditions of the switch-
gear (circuit breakers, isolators, etc.). They must be considered and tested.
8.3.10 Trip and Close Test with the Circuit Breaker
The circuit breaker and tripping circuits can be conveniently tested by the device
7SA522. This may be done for one or two circuit breakers.
The procedure is described in detail in Section 7.3.
If the check does not produce the expected results, the cause may be established from
the text in the display of the device or the PC. If necessary, the connections of the cir-
cuit breaker auxiliary contacts must be checked:
It must be noted that the binary inputs used for the circuit breaker auxiliary contacts
must be assigned separately for the CB-test. It is accordingly not sufficient that the
auxiliary contacts are assigned to the binary inputs with FNo
to
(depending
on the options of the auxiliary contacts); in addition, the corresponding FNos
to
(for CB 1) and /or
to
(for CB 2) must be configured. These are exclusive-
ly used for the CB-test. In addition, the ready state of the circuit breaker for the CB-
test must be indicated to the binary input
(for CB 1) and/or
(for CB 2).
Summary of Contents for siprotec 7SA522
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