•
with I< & aux.contact
For these criteria, the state of the circuit breaker is also taken into account as a further criterion in addi-
tion to the dropout of the tripping function (operate indication is reset by command). You can select
whether the state is determined by means of the current (with I<) or by means of the current in
conjunction with the circuit-breaker auxiliary contacts (with I< & aux.contact). The behavior of
these setting options only differs in one situation of the circuit-breaker state. If the circuit breaker is in
the opening state, the trip command is reset in the case of the option with I<, whereas it is not reset
yet in the case of the option with with I< & aux.contact. The opening state is detected if the auxil-
iary contacts still detect the circuit breaker as being closed and opening is detected via the decreasing
current flow.
As long as the circuit breaker is detected unambiguously as closed (fully closed), the trip command will
not be reset with these setting options.
The information about the condition of the circuit breaker is supplied by the Circuit-breaker position
recognition function block (see 5.7.8 Circuit-Breaker Position Recognition for Protection-Related Auxil-
iary Functions). The determination of the various conditions is also described in this chapter.
Application and Setting Notes
Parameter: Reset of trip command
•
Recommended setting value (_:5341:103) Reset of trip command = with I<
Parameter Value Description
with I<
With this setting, the trip command is reset as soon as the current is removed,
provided the tripping function has dropped out. The most important factor for
recognition of the open circuit breaker is the current falling short of the value
set in the parameter (_:2311:112) Current thresh. CB open.
with I< &
aux.contact
For this setting not only the current has to be removed, but also the circuit-
breaker auxiliary contact has to report that the circuit breaker is open. This
setting assumes that the setting of the auxiliary contact has been routed via a
binary input (for more information, see 5.7.7.3 Acquisition of Circuit-Breaker
Auxiliary Contacts and Further Information).
with dropout
The setting can be selected for special applications in which the trip command
does not result in complete interruption of the current in every case. In this
case, the trip command is reset if the pickup of the tripping protection function
drops out.
The setting is useful if the load current in the system cannot be interrupted
during the protection device test and the test current is fed in parallel with the
load current.
Settings
Addr.
Parameter C Setting Options Default Setting
Trip logic
_:103 Trip logic:Reset of trip
command
•
with I<
•
with I< & aux.contact
•
with dropout
with I<
Information List
No.
Information Data Class
(Type)
Type
Trip logic
_:300 Trip logic:Trip indication ACT O
5.7.6.2
5.7.6.3
5.7.6.4
Function-Group Types
5.7 Function-Group Type Circuit Breaker
282 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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