2.16 Function Control and Circuit Breaker Test
231
7SD610 Manual
C53000-G1176-C145-4
Terminating the
Trip Signal
Once a trip command is initiated, it is phase segregatedly latched (in the event of
three-pole tripping for each of the three poles) (refer to Figure 2-100). At the same
time, the minimum trip command duration TMin TRIP CMD is started. This ensures
that the trip command is output to the circuit breaker for a sufficiently long time even
if the tripping protective function resets very rapidly. The trip commands can only be
reset after all tripping protective functions have dropped out and
after the minimum trip
command duration has elapsed.
A further condition for the reset of the trip command is that the circuit breaker has
opened, in the event of single-pole tripping the relevant circuit breaker pole. In the
function control of the device, this is checked by means of the circuit breaker position
feedback (Section „Detection of the Circuit Breaker Position“) and the flow of current.
In address 1130, the residual current PoleOpenCurrent is set which is certainly un-
dershot when the circuit breaker pole is open. Address 1135 Reset Trip CMD de-
termines under which conditions a trip command is reset. If CurrentOpenPole is set,
the trip command is reset as soon as the current disappears. It is important that the
value set in address 1130 PoleOpenCurrent (see above) is undershot. If Current
AND CB is set, the circuit breaker auxiliary contact must send a message that the
circuit breaker is open. It is a prerequisite for this setting that the position of the auxil-
iary contact is allocated via a binary input. If this additional condition is not required for
resetting the trip command (e.g. if test sockets are used for protection testing), it can
be switched off with the setting Pickup Reset.
Figure 2-100 Storage and termination of the trip command
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