Functions
2.11 Automatic Reclosure Function 79 (Optional)
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
150
The action time 1.AR:ActionTime (address 3451) is the time after initiation (fault detection) by any protec-
tive function which can start the automatic reclosure function within which the trip command must appear. If the
command does not appear until after the action time has expired, there is no reclosure. Depending on the con-
figuration of the protective functions the action time may also be omitted; this applies especially when an initi-
ating protective function has no fault detection signal.
Using 134 AR control mode= TRIP ... you can set the dead time for the 3-pole reclosing cycle at address
3457 1.AR:Dead 3Trip. For 3-pole tripping the power system stability is the main concern. Since the de-
energized line cannot transfer synchronizing energy, only short dead times are allowed. The usual values are
0.3 s to 0.6 s. If the device operates with a synchronism check device, a longer dead time may be tolerated
under certain circumstances. Longer 3-pole dead times are also possible in radial networks.
When 134 AR control mode = Pickup ..., it is possible to make the dead times dependent on the type
of fault detected by the initiating protection function(s).
Table 2-3 AR control mode = with PICKUP ...
If the dead time is to be the same for all types of faults, set all three parameters the same. Note that these
settings only cause different dead times for different pickups.
If, when setting the reaction to evolving 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 evolving
fault 1.AR:DeadT.EV. (address 3458). Stability aspects are also decisive here. Normally the setting con-
straints are similar to address 3457 1.AR:Dead 3Trip.
Under address 3459 1.AR:52? CLOSE it can be determined whether the readiness of the circuit breaker (“cir-
cuit breaker ready”) is interrogated before this first reclosure. With the setting YES, the dead time may be ex-
tended 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 togeth-
er under address 3409 CB TIME OUT (see above). Details about the circuit-breaker monitoring can be found
in the function description, Section 2.11, at margin heading „Interrogation of circuit-breaker ready state“.
Second Reclosing Cycle
If two cycles have been set in the configuration of the scope of protection functions, you can set individual re-
closing parameters for the second cycle. 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.
3453 1.AR:DeadT.1Flt is the dead time after 1-phase pickup,
3454 1.AR:DeadT.2Flt is the dead time after 2-phase pickup,
3455 1.AR:DeadT.3Flt is the dead time after 3-phase pickup,
3461 2.AR:START Start in second cycle generally allowed
3462 2.AR:ActionTime Action time for the second cycle
3464 2.AR:DeadT.1Flt Dead time after 1-phase pickup
3465 2.AR:DeadT.2Flt Dead time after 2-phase pickup
3466 2.AR:DeadT.3Flt Dead time after 3-phase pickup
3468 2.AR:Dead 3Trip Dead time after 3-pole tripping
3469 2.AR:DeadT.EV. Dead time after evolving fault
3470 2.AR:52? CLOSE CB ready interrogation before reclosing
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