'(& )( )'& &) ( &!& ")& &$(( $# Ć %&( $# #)" &&#$
4 - 22
Siemens AG ⋅ May 1998
three-phase
TRIP command
P
t
1
T-CBF
(zone-selective)
L-kx ȧāȧ
>0
transfer trip
command
(feeder-selective)
P 1/2-channel
BI suĆ
pervision
1
unbalancing
Lx
TRIP-R.OP.
P
P
T-TRIP-REP
P >CBF Ayy
P >CBF Ayy
(Lx &
E
)
three-phase
TRIP repetition
phase-selectiv
TRIP repetition
(feeder-selective)
(feeder-selective)
t
1
(figure 4.32,
chapter 4.7.8.5)
&
&
P
>CBF Ayy
trip criteĆ
rion fulfilĆ
led?
(Lx & Ly) v
(Lx &
E
)
(Lx & Ly) v
(Lx &
E
)
Figure 4.17 Flow-chart for TRIP repetition and unbalancing
In the operation mode "TRIP-rep/unb" (
) the CBF is initiated feeder-selective by the TRIP
command. The release signal is usually fault detection
by the feeder protection.
Simultaneously the time delay for TRIP repetition T-
TRIP-REP ( ) and the time delay for unbaĆ
lancing T-CBF ( ) are started.
The TRIP repetition time must be shorter than the
CBF time delay.
TRIP repetition is issued only when the feeder-selecĆ
tive CBF initiation together with the common CBF
release persist after the time delay T-TRIP-REP
( ) has elapsed.
TRIP repetition can alternatively be set to single-
phase or three-phase by the common parameter
"TRIP-R.OP" ( ) (equivalent to chapter
4.6.1.2).
If the TRIP repetition does not effect reset of the proĆ
tection, then unbalancing is initiated after the time
delay T-CBF ( ) has elapsed (equivalent to
chapter 4.6.1.3).
The flow-chart is shown in figure 4.17.
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