Siemens 6MD85 Manual page 543

For the Cyclic automatic reclosing function, 1 cycle is preset. The preset cycle cannot be deleted. You can add
and delete additional cycles from the function library in DIGSI 5.
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Figure 7-21
Automatic Reclosing Function with Adaptive Dead Time
The Automatic reclosing function with adaptive dead time (ADT) works without fixed disruption cycles
(Figure 7-22). The requirement for the usage of ADT is that voltage transformers on the line-side are
connected or there is a possibility to transfer a close command to a remote line end. With the ADT, the Auto-
matic reclosing function decides independently if and when an automatic reclosing is reasonable and permis-
sible and when it is not. The criteria is the phase-to-ground voltage, which is switched through after reclosing
from the opposite line end. The Automatic reclosing function with ADT occurs as soon as it is known that the
line from the opposite end has been placed back under voltage.
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Figure 7-22
Operation with External Automatic Reclosing Function
The cooperation of an external reclosing device with the SIPROTEC protection device occurs through the func-
tion mode Operation with external automatic reclosing function
binary inputs for the influence of the protection functions in the SIPROTEC protection device. The external
automatic reclosing device delivers the close command. The SIPROTEC protection functions then provide for
the trip commands.
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Figure 7-23
Function Control
The automatic reclosing function contains a central function control, see the following figure. You can find
detailed information on the function control in the section Function/Stage Control.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Structure/Embedding of the Cyclic Automatic Reclosing Function
Structure/Embedding of the Automatic Reclosing Function With Adaptive Dead Time (ADT)
Structure/Embedding of the Operating Function With External Automatic Reclosing Function
Protection and Automation Functions
7.2 Automatic Reclosing Function
(Figure 7-23). The function only provides
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