Siemens siprotec 7SJ63, Инструкция по эксплуатации

Страница: 296 / 604

Functions
6-132
7SJ63 Manual
C53000-G1140-C120-1
After the final circuit breaker trip, the automatic reclosing system is dynamically
blocked (see below).
Blocking Time The blocking time (reset time) is started each time a reclosing attempt is initiated. If
the reclosing attempt is successful, then the automatic reclosing system will reset
once the blocking time has elapsed. Occurrence of a fault after the blocking time is
considered a new fault, and the initiation of trip signals by protective elements for this
fault will initiate a new automatic reclosing sequence (and possibly execute a different
reclosing program, depending on the type of fault). When no additional reclosing at-
tempts are permitted, the last reclosing attempt will be considered unsuccessful, and
upon final tripping of the circuit breaker by the protective element(s), the automatic re-
closing system will be dynamically blocked (see below).
Static Blocking The automatic reclosing system is statically blocked for one or more of the following:
−
A blocking signal (FNo. “
!%/2&.
”) is present at a binary input, if the au-
tomatic reclosing system is not initiated.
−
A signal (FNo. “
!&%5HDG\
”) indicating the circuit breaker is ready disap-
pears from a binary input, if the automatic reclosing system is not initiated.
−
The number of allowable reclosing attempts set for both reclosing programs is zero.
−
No protective functions or binary inputs are set to initiate the automatic reclosing
system.
Static blocking means that the automatic reclosing system is not ready to initiate re-
closing, and cannot initiate reclosing as long as the blocking signal is present. When
static blocking takes place, a corresponding message is generated. The static block-
ing signal is also used internally to block the protection elements that are only sup-
posed to work when reclosing is enabled.
Dynamic Blocking Dynamic blocking defeats the possibility of a reclosing attempt when certain events
occur. Dynamic blocking is initiated if:
−
The final reclosing attempt was unsuccessful.
−
The protection function has detected a three-phase fault and the device is pro-
grammed not to reclose into three-phase faults.
−
The circuit breaker is tripped without initiation of the automatic reclosing system.
−
A reclosing signal fails to close a circuit breaker.
−
A protective element picks up that is set to block automatic reclosing (regardless of
whether one or more other protective functions set to initiate automatic reclosing
also pickup).
−
The circuit breaker failure function is initiated.
−
The reclosing program executed is programmed to initiate zero reclosing attempts.
−
A static block occurs after initiation of the automatic reclosing function.
−
Not applicable for version 7SJ61**–**C**– and 7SJ61**–**P**–: The circuit
breaker is not ready for operation after the circuit breaker monitoring time (set at
address
&+(&.&%"
) has elapsed, provided that the circuit breaker monitor
function is set to be in effect.
−
Not applicable for version 7SJ61**–**A**– and 7SJ61**–**M**–: If the circuit
breaker is not ready for operation after the reclosing delay time (triggered by binary
www
. ElectricalPartManuals
. com