3457
1.AR Tdead3Trip
is the dead time after 3-pole tripping.
If you only want to allow a 1-pole reclose cycle, set the dead time for 3-pole tripping to ∞. If you only want to
allow a 3-pole reclose cycle, set the dead time for 1-pole tripping to ∞, the protection then trips 3-pole for
each fault type.
The dead time after 1-pole tripping (if set) 1.AR Tdead1Trip (address 3456) should be long enough for the
short-circuit arc to be extinguished and the surrounding air to be de-ionized so that the reclosure promises to
be successful. The longer the line, the longer is this time due to the charging of the conductor capacitances.
Standard durations are between 0.9 s and 1.5 s.
For 3-pole tripping (address 3457 1.AR Tdead3Trip) the network stability is the main concern. Since the
disconnected line cannot transfer any synchronizing forces, only a short dead time is often permitted. Usual
values are 0.3 s to 0.6 s. If the device is operating with a synchronism check (compare Section
2.4 Synchronism and voltage check (optional)) a longer time may be tolerated under certain circumstances.
Longer 3-pole dead times are also possible in radial networks.
For AR control mode = TRIP ... it is possible to make the dead times dependent on the type of fault
detected by the initiating protection function(s).
Table 2-2 AR control mode = Trip ...
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.
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 address3457 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–OPEN–cycle when the dead time expires. The
maximum extension that is possible is the circuit breaker monitoring time; this 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 2.2 Automatic reclosure function (optional), at margin heading “Interroga-
tion of the Circuit Breaker Ready State”.
If there is a danger of stability problems in the network during a 3-pole reclosure cycle, set address3460 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
address3460 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 configura-
tion of the scope of protection functions.
For the 2nd cycle:
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
Functions
2.2 Automatic reclosure function (optional)
62 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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