Siemens SIPROTEC 7SJ62 Instruction Manual page 276

Functions
Circuit Breaker
Monitoring
Open Breaker
Times
Blocking Three-
Phase Faults
6-136
be set for only a few seconds. In areas with frequent thunderstorms, a shorter blocking
time may be necessary to avoid feeder lockout due to sequential lightning strikes. A
longer blocking time should be chosen if there is no possibility to monitor the circuit
breaker ready status (see below) during multiple reclosing. In this case, the blocking
time should be longer than the time required for the circuit breaker mechanism to be
ready.
If a dynamic blocking of the automatic reclosing system was initiated, then reclosing
functions remain blocked until the circuit breaker is closed manually again (not from a
protective function). The setting at address  6$)(7<  UHDG\ establishes
how long automatic reclosing blocking is extended, after the dynamic blocking is reset.
In this way the delay set at address  also establishes how long automatic reclos-
ing is blocked after manual closing of the circuit breaker. Address  should be set
to ensure a safe close and trip of the circuit breaker (0.5 to 1.0 seconds).
1. Not applicable for version 7SJ61**–**C**– and 7SJ61**–**P**
If circuit breaker monitoring is desired, address  &+(&. &%" should be set to
monitor before each reclosing attempt (&KN HDFK F\FOH), otherwise address 
should be set not to monitor (1R FKHFN). If monitoring is not possible, address 
should be set not to monitor.
If circuit breaker monitoring is accomplished via a binary input that detects a circuit
breaker ready condition, then the device must detect a ready condition prior to the
elapse of the time delay set at address  &% 7,0( 287 or further reclosing will
be suspended.
2. Not applicable for version 7SJ61**–**A**– and 7SJ61**–**M**
If circuit breaker monitoring is accomplished via a binary input that picks up when the
breaker is not ready (FNo.  ! 7 :$,7), then a time delay set at address 
0$;,QKLELW7,0( is started when the dead time has elapsed, and the binary input
must drop out before the time delay elapses, otherwise further reclosing will be sus-
pended.
The dead time preceding the first reclosing attempt is set at address  '($'7,0(
 3+ for the multiple phase fault reclosing program and at address  DEADTIME
1:G for the single phase fault reclosing program. The dead time should be set long
enough to allow a temporary fault to clear (0.9 to 1.5 seconds) unless stability is a con-
cern, in which case faster times may be required (typically 0.3 to 0.6 seconds). The
dead times for the second (2
dresses  , , and  respectively for the multiple phase reclosing program
and at addresses , , and  respectively for the single phase reclosing
program. As was stated earlier, the dead times preceding the fifth (5th) through the
ninth (9th) reclosing attempts are equal to the open breaker time which precedes the
fourth (4th) reclosing attempt.
The number of reclosing attempts is set at address 
multiple phase reclosing program and at address 
single phase reclosing program.
Regardless of which reclosing program is executed, automatic reclosing can be
blocked for three-phase faults at address  3RO3,&.83 %/.. The pickup of
all three phases for a specific phase element is the criterion required for three-phase
fault blocking.
nd th
) through fourth (4 ) reclosing attempts are set at ad-
2) 5(&/ 3+ for the
2) 5(&/ *1' for the
7SJ62 Manual
C53000-G1140-C121-1