Application And Setting Notes - Siemens 6MD85 Manual

Function-Group Types
5.5 Function-Group Type Circuit Breaker, 3-Pole
Trip-Command Reset
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Figure 5-19
Once a trip command is issued, it is stored (see
You determine the criteria for resetting a trip command that has been issued with the parameter Reset of
trip command.
•
with dropout
The trip command is reset if the function that initiated tripping resets its operate indication. This occurs
typically with dropout. Command reset of the trip command takes place regardless of verification of the
circuit-breaker condition.
•
with I<
•
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
iary Functions). The determination of the various conditions is also described in this chapter.
5.5.6.2

Application and Setting Notes

Parameter: Reset of trip command
•
Recommended setting value (_:5341:103) Reset of trip command = with I<
214
Trip-Command Reset
5.5.8 Circuit-Breaker Position Recognition for Protection-Related Auxil-
Figure 5-18).
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017