Functions
6-2797SA6 Manual
C53000-G1176-C133-1
Figure 6-145 Breaker tripping alarm suppression — sequence examples
Trip Dependent
Messages
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.
Figure 6-146 Logic diagram of the trip dependent messages
Switching
Statistics
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.
Protection
pick-up
Protection
trip
Auto-reclosure
(AR)
CB Operation
Detector
Alarm: “Breaker
Tripping”
Manual trip
(as required)
Manual Close via
binary input
“>Manual Close”
CB Pole
„&%$ODUP
6XSS“
AR dead time
Fault inception
Manual opening Final trip of protection function
&
ZLWK3,&.83
ZLWK75,3
)OW'LVS/('/&'
Relay TRIP
„1“
Relay Drop Out
Reset LED and Spontaneous alarms
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