Siemens siprotec 7SJ63, Инструкция по эксплуатации

Страница: 297 / 604

Functions
6-133
7SJ63 Manual
C53000-G1140-C120-1
input with Function No: “
!7:$,7
” and specific setting of delayed AR
command at address
0$;,QKLELW7,0(
) has elapsed.
−
Manual closing was detected (externally).
−
Through an binary input (FNo. “
!%/2&.
”) configured with functions of
dynamic blocking.
Upon initiation of dynamic blocking, automatic reclosing is disabled. Automatic reclos-
ing will resume only when the circuit breaker is closed again and the dynamic blocking
time has elapsed. The dynamic blocking time also blocks reclosing when a circuit
breaker is operated manually.
Circuit breaker sta-
tus The detection of the actual circuit breaker position is necessary for the correct func-
tionality of the auto reclose function. The breaker position can be detected via the
breaker contact or the current criteria. (address
%NU&ORVHG,0,1
). The
method to be used depends on the masking of the binary inputs: “
!D
” (FNo. 4601)
and “
!E
” (FNo. 4602). The following applies:
•
Masking of “
!D
”: The breaker contact will be used. The current criteria is not
used.
•
Masking of “
!E
”: The breaker contact will be used. The current criteria is not
used.
•
Masking of “
!D
” and “
!E
”: Breaker contacts will be used, if an intermediate
postion is not detected. As soon as an intermediate position is detected (both binary
inputs are low or both are high) the current criteria will be used. If the primary current
is higher then the setting under address
%NU&ORVHG,0,1
the breaker is
considered as closed.
•
No masking of binary inputs: If the primary current is higher then the setting under
address
%NU&ORVHG,0,1
the breaker is considered as closed.
Circuit Breaker
Monitoring The ability of a circuit breaker to reclose and re-trip if necessary can be monitored by
the 7SJ63 relay. There are two methods to achieve this:
1st Method: Not applicable for version 7SJ61**–**C**– and 7SJ61**–**P**
A precondition for a reclosing attempt, following a trip command initiated by a protec-
tive relay element and subsequent initiation of the automatic reclosing function, is that
the circuit breaker is ready for at least one TRIP-CLOSE-TRIP cycle. The readiness
of the circuit breaker is monitored by the device using a binary input (FNo.
“
!&%
5HDG\
”). In the case where this signal from the breaker mechanism is not available,
the circuit breaker monitoring feature should be disabled, otherwise reclosing attempts
will remain blocked.
For a situation where only one reclosing attempt will be made, monitoring of the circuit
breaker when automatic reclosing is initiated should be sufficient. However, when mul-
tiple reclosing attempts are programmed, it is a good idea to monitor the circuit breaker
condition prior to each reclosing attempt as well, since operation of, for example,
pneumatically controlled circuit breakers will result in reduced air pressure. A reclosing
attempt will be blocked until the binary input, configured with the function
indi-
cates that the circuit breaker is ready to complete another CLOSE-TRIP cycle. When
the
binary input drops out i.e. during the dead time of the reclose cycle, indicat-
ing that the circuit breaker is not ready, a programmable monitoring delay time (Ad-
dress
&%7,0(287
) is initiated.
www
. ElectricalPartManuals
. com