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5.2.3
Functionality
The circuit breaker failure protection function 50BF is activated by trip commands from
the protection functions. The commands are either internal commands to the terminal or
external commands through binary inputs. The pickup command is always a default for
three-phase operation. 50BF includes a three-phase conditional or unconditional retrip
function, and also a three-phase conditional back-up trip function.
50BF uses the same levels of current detection for both retrip and back-up trip. The
operating values of the current measuring elements can be set within a predefined setting
range. The function has two independent timers for trip purposes: a retrip timer for the
repeated tripping of its own breaker and a back-up timer for the trip logic operation for
upstream breakers. A minimum trip pulse length can be set independently for the trip
output.
The function contains a blocking functionality. It is possible to block the function outputs,
if desired.
5.2.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are “Enable” and “Disable”.
The operation of 50BF can be described using a module diagram. All the modules in the
diagram are explained in the next sections. Also further information on the retrip and
backup trip logics is given in sub-module diagrams.
TRRET
BLOCK
CB_FAULT
TRBU
Back-up
trip
logic
POSCLOSE
PICKUP
IG OR Io
Retrip
logic
Level
detector
2
Level
detector
1
I_A
I_B
I_C
t
Timer 2
t
Timer 3
CB_FAULT_AL
Start
logic
t
Timer 1
GUID-982A97AE-DFE5-4AFF-B894-D12B078F25C4 V1 EN
Figure 388:
Functional module diagram
1MAC059074-MB A
Section 5
Protection related functions
615 series ANSI
773
Technical Manual
Содержание Relion 615 series
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