Siemens 6MD85, Manual

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Close Command
As soon as the test of the circuit-breaker readiness and the synchrocheck deliver a positive result, the closing
indication will be created. It will be assigned for 100 ms. The actual close command is not created by the auto-
matic reclosing function, but rather from the circuit-breaker function block outside of the automatic reclosing
function. Here the set maximum duration of the close command is also considered.
In addition to the closing indication, additional indications will be created that describe the type of closure.
These include:
•
Close command after 1-pole tripping in the 1st cycle (
Cls.cmd after 1p.1.cyc
)
•
Close command after 3-pole tripping in the first cycle (
Cls.cmd after 3p.1.cyc
)
•
Close command after 1-pole or 3-pole tripping starting with the second cycle (
CloseCmd >=2nd.cyc
)
Creation of the Signal Remote close signal
The cyclic automatic reclosing function can create information
Remote close signal
. This information
can be transferred to the protection device as a binary signal on the line that is to be protected on the oppo-
site end. From the reclosing function, it can be processed in the operating mode adaptive dead time (ASP).
Furthermore, the binary signal may be arranged as data for transmission via an existing protection interface.
The information
Remote close signal
is created by the closing logic. It can be delayed by a set time over
the local close indication. With this delay, you can make sure that information is only set if the automatic
reclosing was successful and there was no further tripping. The pulse duration of the inter-close signal has a
fixed length of 500 ms.
Reclaim Time
With the assignment of the close command, the automatic reclosing function goes into the reclaim time
state. During this time, it is decided if the current reclosing cycle was successful or not.
•
If during the reclaim time no further tripping occurs, the currently running automatic reclosing cycle, and
thus the entire automatic reclosing, was successful.
•
If during the reclaim time another tripping occurred, the currently running automatic reclosing cycle was
not successful. If other automatic reclosing cycles are permitted, one of these cycles will be used to
continue the process. If, in contrast, the currently executed cycle was the last permissible cycle, the auto-
matic reclosing process will end and be reported as unsuccessful.
In both cases, the automatic reclosing function switches back to the idle state automatic reclosing function
ready.
Short Circuits during Running Reclaim Time
A trip command that occurs during a reclaim time leads to a cancellation of the reclaim time. If further auto-
matic reclosing cycles are allowed, the regulation of the cycle depends on if the automatic reclosing function
is executed in an operating mode with action times or without action times, see
Figure 7-48 .
•
With operating modes with action time, the action times of all higher cycles are started with the begin-
ning of the new general pickup if these are not blocked. The cycle with the lowest cycle number is
selected, whose action time is not yet expired with the incoming trip indication. If no further cycles are
possible or if the action times of all possible cycles are expired before the operate indication, there will be
no further reclosing.
•
With the operating modes without action time, the cycle following the current cycle will always be
selected in the set cycle. If this is blocked, the cycle following this one will be selected, etc. If no higher
cycles exist or if they are all blocked, there will be no further automatic reclosing.
7.2.4.15
Protection and Automation Functions
7.2 Automatic Reclosing Function
568 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017