Siemens SIPROTEC, Manual

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Functions
2.17 Automatic Reclosure Function (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
340
For AR control mode = with PICKUP ... it is possible to make the dead times dependent on the type of
fault detected by the initiating protection function(s).
Table 2-15 AR control mode =
with PICKUP ...
If the dead time is to be the same for all fault types, set all three parameters the same. Note that these settings
only cause different dead times for different pickups. The tripping can only be 3-pole.
If, when setting the reaction to sequential faults (see above at „General“), you have set address
3407 EV.
FLT. MODE starts 3p AR
, you can set a separate dead time for the 3-pole dead time after clearance of the
sequential fault
1.AR: Tdead EV.
(address
3458
). Stability aspects are also decisive here. Normally the
setting constraints are similar to address
3457 1.AR Tdead3Trip
.
Under address
3459 1.AR: CB? CLOSE
it can be determined whether the readiness of the circuit breaker
("circuit breaker ready") is interrogated before this first reclosure. With the setting
YES
, the dead time may be
extended if the circuit breaker is not ready for a CLOSE–TRIP–cycle when the dead time expires. The
maximum extension that is possible is the circuit breaker monitoring time; this time was set for all reclosure
cycles under address
3409 CB TIME OUT
(see above). Details about the circuit breaker monitoring can be
found in the function description, Section 2.17, at margin heading „Interrogation of the Circuit Breaker Ready
State“.
If there is a danger of stability problems in the network during a 3-pole reclosure cycle, you should set address
3460 1.AR SynRequest
to
YES
. In this case, it is verified before each reclosure following a 3-pole trip
whether the voltages of feeder and busbar are sufficiently synchronous. This is only done on condition that
either the internal synchronism and voltage check functions are available, or that an external device is available
for synchronism and voltage check. If only 1-pole reclose cycles are executed or if no stability problems are
expected during 3-pole dead times (e.g. due to closely meshed networks or in radial networks), set address
3460
to
NO
.
2nd to 4th Reclose Cycle
If several cycles have been set in the configuration of the scope of protection functions, you can set individual
reclosure parameters for the 2nd to 4th cycles. The same options are available as for the first cycle. Again, only
some of the parameters shown below will be available depending on the selections made during configuration
of the scope of protection functions.
For the 2nd cycle:
3453 1.AR Tdead 1Flt is the dead time after 1-phase pickup,
3454 1.AR Tdead 2Flt is the dead time after 2-phase pickup,
3455 1.AR Tdead 3Flt is the dead time after 3-phase pickup.
3461 2.AR: START Start in 2nd cycle generally allowed
3462 2.AR: T-ACTION Action time for the 2nd cycle
3464 2.AR Tdead 1Flt Dead time after 1-phase pickup
3465 2.AR Tdead 2Flt Dead time after 2-phase pickup
3466 2.AR Tdead 3Flt Dead time after 3-phase pickup
3467 2.AR Tdead1Trip Dead time after 1-pole tripping
3468 2.AR Tdead3Trip Dead time after 3-pole tripping
3469 2.AR: Tdead EV. Dead time after evolving fault
3470 2.AR: CB? CLOSE CB ready interrogation before reclosing
3471 2.AR SynRequest Sync. check after 3-pole tripping