Siemens 6MD85, Manual

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Parameter: Dead-line check/reduc.d.t
This parameter is not important and cannot be set if you use the ADT function (automatic reclosing function
with adaptive dead time).
•
Default setting
(_:6601:113) Dead-line check/reduc.d.t
=
without
With the
Dead-line check/reduc.d.t
parameter, you can determine if the automatic reclosing function
should work with one of the additional functions
Dead-line check DLC
or
Reduced dead t. RDT
.
Parameter Value Description
without
The automatic reclosing function occurs after the expiration of the parameter-
ized dead times. DLC or RDT are not activated.
Reduced dead t. RDT
The automatic reclosing function works with a reduced dead time (RDT).
Dead-line check DLC
The automatic reclosing functions works with dead-line check. The closing indi-
cation is only assigned if the line was really de-energized during the dead time.
You can find detailed information about the functionality in the chapter 7.2.4.18 Dead-Line Checking (DLC)
and Reduced Dead Time (RDT) .
i
i
NOTE
Use RDT or DLC only if the voltages of the line can be correctly measured with an open circuit breaker. This
is only possible if the voltage transformer is aligned on the line-side - seen from the circuit breaker.
Parameter: Volt.thres. f. dead line/bus
This parameter is only important if you use the Dead-line check subfunction. If you do not use any of this
subfunction, the setting of this parameter is free to select.
•
Default setting
(_:6601:116) Volt.thres. f. dead line/bus
=
30 V
With the
Volt.thres. f. dead line/bus
parameter, you can determine the limit voltage below which
the line should be seen with certainty as idle or switched off. The threshold value is used by the Dead-line
check subfunction (dead-line check). The reference size is the phase-to-ground voltage.
You can find detailed information about the functionality in the chapter
7.2.4.18 Dead-Line Checking (DLC)
and Reduced Dead Time (RDT) .
Parameter: Send delay f. remot. close
With the
Send delay f. remot. close
parameter, you can determine after which time after the auto-
matic reclosing function the information is sent to the remote closing.
•
Default setting
(_:6601:112) Send delay f. remot. close
=
oo (invalid)
The transmission delay prevents the device operating in the adaptive dead time mode on the opposite side
from closing unnecessarily if the local reclosing function remains unsuccessful. On the other hand, it must be
remembered that the line is not available for transporting energy as long as the opposite end is also closed.
Thus, the
Send delay f. remot. close
must be added to the dead time in order to determine the
system stability.
You can find detailed information about this functionality in the chapter
7.2.4.14 Closing Indication and Close
Command .
Application and Setting Notes for 1 Cycle of the Cyclic Automatic Reclosing
Function
For the function of the cyclic automatic reclosing function, 1 cycle is preset. The preset cycle cannot be
deleted. You can add and delete more cycles from the function library in DIGSI 5.
7.2.8
Protection and Automation Functions
7.2 Automatic Reclosing Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 591
C53000-G5040-C015-9, Edition 11.2017