Siemens 6MD85 Manual page 590

Protection and Automation Functions
7.2 Automatic Reclosing Function
Parameter: Max. dead-time delay
This parameter is not important and cannot be set if you use the ADT function (automatic reclosing function
with adaptive dead time).
•
Default setting (_:6601:110) Max. dead-time delay = 0.5 s
With the Max. dead-time delay parameter, you determine at which time the starting of the dead time
may be delayed before the automatic reclosing function is dynamically blocked.
The delay of the start of the dead time is possible with the binary input >Dead time start delay .
You can find detailed information about the functionality in the chapter
Parameter: Max. dead-time extension
•
Default setting (_:6601:111) Max. dead-time extension = 1.2 s
With the Max. dead-time extension parameter, you determine the time by which the dead time may be
extended before the automatic reclosing function is dynamically blocked.
With the setting oo (invalid), the extension is unlimited.
An extension of the dead time can be required under the following conditions:
•
Waiting for the readiness of the circuit breaker
•
Inquiry of a synchronous test
•
Delay through binary input in order e.g. to give the leading automatic reclosing function priority in a
system with 1 1/2 circuit breaker layout.
Remember that longer dead times after 3-pole disconnection are only permissible if no stability problems
occur or if a synchronous test occurs before the reclosing.
You can find detailed information about the functionality in the chapter
Command .
Parameter: Voltage supervision time
This parameter is only important if you use the subfunctions RDT, DLC, or the ADT function. If you do not use
any of these functions, the setting of this parameter is free to select.
•
Default setting (_:6601:114) Voltage supervision time = 0.1 s
With the Voltage supervision time parameter, you can determine the measuring time that is available
as a criteria for the voltage decision. It should be longer than all transient oscillations through switching oper-
ations.
For the subfunctions Reduced dead time and Reclosing function with adaptive dead time, this measuring
time applies for the determination of the surpassing of a voltage threshold. For the subfunction Dead-line
check, the surpassing of a voltage threshold is checked.
Siemens recommends the setting 0.10 s.
Detailed information about the functionality can be found in the following parameters and in the chapters
7.2.4.18 Dead-Line Checking (DLC) and Reduced Dead Time (RDT)
Parameter: Volt. thres.f. live line/bus
This parameter is only important if you use the subfunction RDT or the function ADT. If you do not use any of
these functions, the setting of this parameter is free to select.
•
Default setting (_:6601:115) Volt. thres.f. live line/bus = 48 V
With the Volt. thres.f. live line/bus parameter, you can determine the limit voltage above which
the line should be seen as fault-free. It must be lower than the smallest expected operating voltage. The
phase-to-ground voltage applies as the reference value.
Detailed information about the functionality can be found in the following settings and in the chapters
7.2.4.18 Dead-Line Checking (DLC) and Reduced Dead Time (RDT)
590
7.2.4.5 Start.
7.2.4.14 Closing Indication and Close
and 7.2.5.1 Description.
and 7.2.5.1 Description.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017