shows the generation of the internal signal “52 closed” (see
left) if at least one breaker
pole is closed.
Using binary input 1424
>50BFSTRTonlyT2
, the trip time delay 3906
50BF-2 Delay
can be started. After it
has elapsed, the breaker failure protection TRIP command 1494
50BF BusTrip
is generated.
[lo-svs-signal-hiko-20101108, 1, en_US]
Figure 2-37
Generation of the signal "CB aux closed"
If an internal protection function or an external protection device trips without current flow, the breaker
failure protection is initiated by the internal input “Start internal w/o I”, if the trip signal comes from the
internal voltage protection or frequency protection, or by the external input
>50BF STARTw/oI
. In this case
the start signal is maintained until the circuit breaker is signaled to be open by the auxiliary contact criterion.
Initiation can be blocked via the binary input
>BLOCK 50BF
(e.g. during test of the feeder protection relay).
[lo-svs-phasengem-anwurf-20101108, 1, en_US]
Figure 2-38
Circuit-breaker failure protection with common phase initiation
Time Delays
When the initiate conditions are fulfilled, the associated timers are started. The circuit-breaker pole(s) must
open before the associated time has elapsed.
Time delays can be set for 3-pole initiation and for two-element protection.
With single-element breaker failure protection, the trip command is relayed to the adjacent circuit breakers
which interrupt the fault current if the local feeder breaker fails (see
cent circuit breakers are those located at the busbar or busbar section to which the feeder under consideration
Functions
2.6 Circuit Breaker Failure Protection 50BF
SIPROTEC 4, 7SD80, Manual
97
E50417-G1100-C474-A2, Edition 02.2018
Summary of Contents for SIPROTEC 4 7SD80
Page 8: ...8 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 10: ...10 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 18: ...18 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 248: ...248 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 298: ...298 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 312: ...312 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 322: ...322 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 400: ...400 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...
Page 402: ...402 SIPROTEC 4 7SD80 Manual E50417 G1100 C474 A2 Edition 02 2018 ...