Blocking the entire synchrocheck function is possible via the binary input
>BLK 25-1
. The message signaling
this condition is output via
25-1 BLOCK
. With the blocking, the measurement is terminated and the entire
function is reset. A new measurement can only be performed with a new measurement request.
Via the binary input
>BLK 25 CLOSE
it is possible to block only the release signal for closing (
25 CloseRe-
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.
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 (
25 Measu.
req.
) to the synchrocheck function which is then started. Having completed the check, the synchrocheck
function issues the release message (
25 CloseRelease
) to which the control responds by terminating the
switching operation either positively or negatively.
[zusam-wirk-steuer-synchro-fkt-061115, 1, en_US]
Figure 2-113 Interaction of control and synchrocheck function
With Automatic Reclosing
The automatic reclosing (AR) function can also interact with the synchrocheck function. They are linked via the
device control. The selection is made via configuration in the automatic reclosing and synchrocheck function.
The AR parameters (7138 Internal SYNC) determine whether working with SYNC function group 1 or - in
the case of external synchronization - without SYNC function group. The switch to be used is defined in func-
tion group 1. The switchgear component indicated in the AR parameters (7137 Cmd.via control) and the
SYNC function group must be identical. If no SYNC function group is entered in the AR parameters, the close
command of the AR function is carried out asynchronously via the switchgear component indicated in the AR
parameters. Equally, the CLOSE command
79 Close
(message 2851) allows only asynchronous switching. If,
for example, circuit breaker Q0 is configured as object to be switched synchronously, a CLOSE command of
the AR function will address this breaker and assign it a CLOSE command which will be processed by the
control. As this breaker requires synchronization, the control launches the synchrocheck function and awaits
release. If the configured conditions of the SYNC function group are fulfilled, the release is granted and the
control issues the CLOSE command.
2.20.5
Functions
2.20 Synchrocheck
SIPROTEC Compact, 7SC80, Manual 341
E50417-G1140-C486-A8, Edition 07.2017
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