Siemens SIPROTEC 4 7VK61 Manual page 45

Activation and deactivation
The automatic reclosure function can be switched on and off by means of the parameter 3401 AUTO
RECLOSE via the system interface (if available) and via binary inputs (if allocated). The switch states are saved
internally (refer to
from where it had previously been switched off. To be active, the function must be switched on from all three
switching sources.
Alteration of the switching state via setting or system interface is not possible during a running fault.
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Figure 2-6
Selectivity before Reclosure
In order for automatic reclosing to be successful, all faults occurring on the entire line length must be cleared
at both line ends simultaneously — as quickly as possible. Therefore, an instantaneous protection element is
usually set to operate before the automatic reclose function initiates a reclosure.
lectivity in favor of fast simultaneous tripping is accepted here because reclosing will be performed in any
case.
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Figure 2-7
If the fault protection features a so-called reclose stage, 7VK61 generates the signal
its release for as long as the reclose function is ready for reclosure after tripping.
If the feeder protection is capable of activating its reclose stage for 1-pole faults but not for multi-pole faults,
the automatic reclose function can supply the signal
Program1pole . This signal indicates that the automatic reclose function initiates reclosure only after 1-pole
tripping, but not after 3-pole tripping i.e., the reclose function is only programmed to 1-pole reclosure.
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Figure 2-6) and secured against loss of auxiliary supply. Basically, it can only be switched on
Activation and deactivation of the auto-reclosure function
Reach control before first reclosure, using distance protection
2.2 Automatic reclosure function (optional)
AR 1.CycZoneRel in addition to the signal AR
Functions
(Figure 2-7). A limited unse-
AR 1.CycZoneRel for
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