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2 Functions
mode = with Pickup was set, different dead times can be parameterised depending
on the type of fault recognised by the protection.
If the fault is cleared (successful reclosure), the reclaim time expires and all functions
return to their quiescent state. The fault is cleared.
If the fault has not been eliminated (unsuccessful reclosure), the short-circuit protec-
tion initiates a final trip following a protection stage active without reclosure. Any fault
during the reclaim time leads to a final trip.
After unsuccessful reclosure (final tripping) the automatic reclosure is blocked dynam-
ically (see also margin heading „Reclose Block", above).
The sequence above applies for single reclosure cycles. In 7SD610 multiple reclosure
(up to 8 shots) is also possible (see below).
Sequence of a
Single-pole reclose cycles are only possible with the appropriate device version and if
this was selected during the configuration of the protective functions (address 110
single-pole reclose
Trip mode, see also Section 2.1.1.2). Of course, the circuit breaker must also be suit-
cycle
able for single-pole tripping.
If the automatic reclosure function is ready, the short-circuit protection trips single-pole
for all single-phase faults inside the stage(s) selected for reclosure. Under the general
settings (address 1156 Trip2phFlt, see also Section 2.1.4.1) it can also be select-
ed that single-pole tripping takes place for two-phase faults without earth. Single-pole
tripping is of course only possible by short-circuit protective functions which can deter-
mine the faulty phase.
If multiple-phase faults occur, the fault protection issues a final three-pole trip with the
stage that is valid without reclosure. Any three-pole trip is final. The automatic reclo-
sure function is blocked dynamically (see also margin heading „Blocking reclosure",
above).
The automatic reclosure is started in the case of single-pole tripping. The (adjustable)
dead time for the single-pole reclose cycle starts with reset of the trip command or
opening of the circuit breaker pole (auxiliary contact criterion). After expiry of the dead
time, the circuit breaker receives a close command. At the same time, the (adjustable)
blocking time is started. If the reclosure is blocked during the dead time following a
single-pole trip, immediate three-pole tripping can take place as an option (forced
three-pole trip).
If the fault is cleared (successful reclosure), the reclaim time expires and all functions
return to their quiescent state. The fault is cleared.
If the fault has not been eliminated (unsuccessful reclosure), the short-circuit protec-
tion initiates a final three-pole trip following the protection stage valid without reclo-
sure. Any fault during the blocking time leads to a final three-pole trip.
After unsuccessful reclosure (final tripping) the automatic reclosure is blocked dynam-
ically (see also margin heading „Reclose Block", above).
The sequence above applies for single reclosure cycles. In 7SD610 multiple reclosure
(up to 8 shots) is also possible (see below).
Sequence of a
This operating mode is only possible with the appropriate device version and if this
was selected during configuration of the protective functions (address 110, see also
single- and three-
pole reclose cycle
Section 2.1.1.2). Of course, the circuit breaker must also be suitable for single-pole
tripping.
If the automatic reclosure function is ready, the short-circuit protection trips single-pole
for single-phase faults inside the stage(s) selected for reclosure, it trips three-pole for
128
7SD610 Manual
C53000-G1176-C145-4
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