Siemens 7SJ85 - Trip Logic; Function Description

Trip Logic
Function Description
The Trip logic function block receives the group operate indication from the Protection function group or
Protection function groups and forms the protection trip command that is transmitted to the Circuit-breaker
function block.
The Circuit-breaker function block activates the device contact and thus causes the circuit breaker to open
(see 5.7.7 Circuit Breaker). The command output time is also effective here.
The trip logic also decides when the protection trip command is reset (see Figure 5-76).
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Figure 5-75 Trip Command
Trip-Command Reset
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Figure 5-76 Trip-Command Reset
Once a trip command is issued, it is stored (see Figure 5-75).
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<
5.7.6
5.7.6.1
Function-Group Types
5.7 Function-Group Type Circuit Breaker
SIPROTEC 5, Overcurrent Protection, Manual 281
C53000-G5040-C017-8, Edition 07.2017