1MRS751802-MUM
REX 521
161
Protection Relay
Technical Reference Manual, Standard Configurations
On the overcurrent stages 3I>, 3I>> and 3I>>>, the Blocking 1 input signal is
connected to the BS1 input and the Blocking 2 input signal is connected to the BS2
input of the function. The BS1 in this application example will stop the DT or IDTM
timer and the BS2 will block the trip signal. Refer to the CD-ROM
Technical
Descriptions of Functions
(see Section 1.5. Related documents) for more
information about the different protection function blocks.
In this application example the digital input DI9 is connected to the input signal
Blocking 1 and then routed to the BS1 input of the overcurrent stage 3I>>. The
Blocking 1 signal can be found in
Main menu\Configuration\Input
Signals\Blocking 1\
where DI9 is selected. The checksum for the
switchgroup in
Main menu\Configuration\Input SWGRP\
Blocking 1\
should be 2 to block the 3I>>.
9.3.4.2.
Circuit-breaker failure protection
All of the protection functions in the standard configuration B01 provide a delayed
trip signal CBFP after the trip signal unless the fault has not disappeared during the
set CBFP time delay. In the circuit-breaker failure protection, the CBFP output can
be used for operating an upstream circuit breaker.
The settings for breaker failure are set separately for each protection function. For
example, to set the CBFP time for 3I>>, go to
Main menu\Protection\3I>>\Control setting
, where it is possible
to set the
CBFP time
from 100 ms to 1000 ms. The control parameter
Trip
pulse
sets the width of the trip output signal, but also of the CBFP output signal.
The CBFP signals from the protection functions are routed to the output signals via
the output switchgroups. These settings can be found in
Main menu\Configuration\Output SWGRP\CBFP
. When the three-stage
overcurrent and two-stage earth fault protection are selected the checksum for CBFP
will be 31.
The CBFP signal is then connected to any of the output relays, via
Main menu\Configuration\Output Signals\
. In this example, the
circuit-breaker failure signal is connected to the power output 1, PO1.
Содержание REX 521
Страница 1: ...Protection Relay REX 521 Technical Reference Manual Standard Configurations ...
Страница 2: ......
Страница 12: ...12 ...
Страница 22: ...22 ...
Страница 62: ...62 ...
Страница 72: ...72 ...
Страница 128: ...128 ...
Страница 132: ...132 ...
Страница 172: ...172 ...
Страница 198: ...198 ...
Страница 249: ......