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Functions
Manual trip
(as required)
Manual Close via
binary input
">Manual Close"
Protection
pick-up
Protection
trip
Auto-reclosure
(AR)
CB Pole
CB Operation
Detector
„CB Alarm
Supp"
Alarm: "Breaker
Tripping"
Manual opening
Figure 6-155 Breaker tripping alarm suppression — sequence examples
Trip Dependent
Messages
Switching
Statistics
6-302
The latching of fault messages, allocated to the device LEDs and the storage of spon-
taneous 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 distur-
bance 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 6-156 shows the logic diagram of this function.
0610
FltDisp.LED/LCD
with PICKUP
„1"
with TRIP
Relay TRIP
Relay Drop Out
Figure 6-156 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
Final trip of protection function
7SA6 Manual
C53000-G1176-C156-2
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