Siemens Siprotec 7VK61 Manual page 60

Functions
2.2 Automatic reclosure function (optional)
time may be tolerated under certain circumstances. Longer three-pole dead times are also possible in radial
networks.
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 2-2
3453 1.AR Tdead 1Flt
3454 1.AR Tdead 2Flt
3455 1.AR Tdead 3Flt
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 three-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 three-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 2.2, at margin heading „Interrogation of the Circuit Breaker Ready
State".
If there is a danger of stability problems in the network during a three-pole reclosure cycle, set address 3460
1.AR SynRequest to YES. In this case a check is made before each reclosure following a three-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 single-pole reclose cycles are executed or if no stability problems
are expected during three-pole dead times (e.g. due to closely meshed networks or in radial networks), set
address 3460 to NO.
2nd to 4th reclosure 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:
3461 2.AR: START
3462 2.AR: T-ACTION
3464 2.AR Tdead 1Flt
3465 2.AR Tdead 2Flt
3466 2.AR Tdead 3Flt
3467 2.AR Tdead1Trip
3468 2.AR Tdead3Trip
3469 2.AR: Tdead EV.
3470 2.AR: CB? CLOSE
3471 2.AR SynRequest
60
AR control mode = with PICKUP ...
is the dead time after single-phase pickup,
is the dead time after two-phase pickup,
is the dead time after three-phase pickup.
Start in 2nd cycle generally allowed
Action time for the 2nd cycle
Dead time after single-phase pickup
Dead time after two-phase pickup
Dead time after three-phase pickup
Dead time after single-pole tripping
Dead time after three-pole tripping
Dead time after evolving fault
CB ready interrogation before reclosing
Sync. check after three-pole tripping
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009