Siemens siprotec 7SA6 User Manual page 461

Manual trip
(as required)
Manual Close via
binary input
">Manual Close"
Protection
pick-up
Protection
trip
Auto-reclosure
(AR)
CB Pole
CB Operation
Detector
„&% $ODUP
6XSS"
Alarm: "Breaker
Tripping"
Manual opening
Figure 6-145 Breaker tripping alarm suppression — sequence examples
Trip Dependent
Messages
Switching
Statistics
7SA6 Manual
C53000-G1176-C133-1
The latching of fault messages, allocated to the device LEDs and the storage of
spontaneous messages after tripping may be made dependant on whether the device
has issued a trip command. This information is then not output if during a system
disturbance one or more protection functions have picked up, but no tripping by the
7SA6 resulted because the fault was cleared by a different device (e.g. on another
line). In this manner, these messages are restricted to faults occurring on the
protected feeder ("no trip – no flag").
Figure 6-146 shows the logic diagram of this function.
%  Ay‡9v†ƒG@9G89
v‡uÃQD8FVQ
v‡uÃUSDQ
„1"
Relay TRIP
Relay Drop Out
Figure 6-146 Logic diagram of the trip dependent messages
The number of trips initiated by the device 7SA6 are counted. If the device is capable
of single-pole tripping, a separate counter for each circuit breaker pole is provided.
Fault inception
AR dead time
&
Reset LED and Spontaneous alarms
Functions
Final trip of protection function
6-279