Direct Command / Blocking; Interaction With Control, Automatic Reclosing And External Control - Siemens SIPROTEC 4 Manual

•
Is the reference voltage V
•
Is the voltage to be synchronized V
•
Is the frequency f
After successful completion of the checks, the release is granted.
For connecting the de-energized component 1 to the energized component 2 or the de-energized component
1 to the de-energized component 2, the conditions to be fulfilled correspond to those stated above.
The associated messages indicating the release via the corresponding condition are as follows:
25 V1< V2> and 25 V1< V2< .
Via the binary inputs
externally, provided the synchronization is controlled externally.
The parameter TSUP VOLTAGE (address 6111) can be set to configure a monitoring time which requires the
additional release conditions stated above to be present for de-energized connection before connection is
allowed.

Direct Command / Blocking

2.20.4
Parameter 6110 Direct CO can be set to grant a release without performing any checks. In this case,
connection is allowed immediately when initiating the synchrocheck function. It is obviously not reasonable to
combine Direct CO with other release conditions.
If the synchrocheck function fails, a direct command may be issued or not, depending on the type of failure
(also see "Plausibility Check" and "SYNC Error").
Via the binary input
Blocking the entire synchrocheck function is possible via the binary input
this condition is output via
function is reset. A new measurement can only be performed with a new measurement request.
Via the binary input
lease ). When the blocking is active, measurement continues. The blocking is indicated by the message 25
CLOSE BLK . When the blocking is reset and the release conditions are still fulfilled, the release signal for
closing is issued.
2.20.5

Interaction with Control, Automatic Reclosing and External Control

With Control
Basically, the synchrocheck function interacts with the device control. The switchgear component to be
synchronized is selected via a parameter. If a CLOSE command is issued, the control takes into account that
the switchgear component requires synchronization. The control sends a measurement request (
req. ) to the synchrocheck function which is then started. Having completed the check, the synchrocheck
function issues the release message (
switching operation either positively or negatively.
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
above the setting value Vmin and V> but below the maximum voltage Vmax?
1
below the setting value V<?
2
within the permissible operating range f
1
>25 V1>V2< , >25 V1<V2> and >25 V1<V2< , the release conditions can also be issued
>25direct CO , this release can also be granted externally.
25-1 BLOCK . With the blocking, the measurement is terminated and the entire
>BLK 25 CLOSE it is possible to block only the release signal for closing ( 25 CloseRe-
25 CloseRelease ) to which the control responds by terminating the
± 3 Hz?
Nom
>BLK 25-1 . The message signaling
Functions
2.20 Synchrocheck
25 V1> V2< ,
25 Measu.
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