Functional Sequence
The synchronization function only operates if it receives a measurement request. This request may be issued
by the control, the automatic reclosing function or externally via a binary input e.g., from an external auto-
matic reclosing system.
The measurement request performs certain plausibility checks (for further information see “Plausibilty Check”).
If there is a condition which is not plausible, the message
25 Sync. Error
is output. The measurement is
then not performed. If conditions are plausible, measurement is initiated (message
„25x meas.“
; with x =
1..n, according to the function group). Depending on the selected operating mode, the configured release
conditions are then checked (see margin heading titles “Synchrocheck” / “Synchronous/Asynchronous”).
Each condition met is indicated explicitly (messages
25 Vdiff ok
,
25 fdiff ok
,
25 αdiff ok
). Also
conditions not fulfilled are indicated, for example, when voltage differences (messages
25 V2>V1
,
25
V2<V1
), frequency differences (messages
25 f2>f1
,
25 f2<f1
) or angle differences (messages
25 α2>α1
,
25 α2<α1
) lie outside the threshold values. For these messages to be sent, both voltages must lie within the
operating range of the synchrocheck (see margin heading “Operating Range”).
If these conditions are met, the synchronization function issues a release signal for closing the breaker (
25
CloseRelease
). This release signal is only available for the configured duration of the CLOSE command and
is always processed by the control, which issues the actual CLOSE command for controlling the circuit breaker
(see also margin heading “Interaction with Control”). The message
25 Synchron
is applied as long as the
synchronous are fulfilled.
Measuring the synchronism conditions can be confined to the a maximum monitoring time
T-SYN. DURA-
TION
. If the conditions are not fulfilled during
T-SYN. DURATION
, the release is cancelled (message
25
MonTimeExc
). A new synchronization can only be performed if a new measurement request is received.
Validity Check / SYNC Error
During startup of the device a parameter validation check is performed. When there is a fault, the message
25
Set-Error
is produced. If after a measurement request there is a condition which is not plausible, the
message
25 Sync. Error
is output. The measurement is then not initiated.
The following plausibility checks are carried out:
•
Checking unique function group identification
•
Checking the configuration
•
Evaluation of monitoring functions
If one and the same function group has multiple selections, error message
25 FG-Error
is output addition-
ally. The synchronization function cannot be controlled via a binary input.
Concerning configuration it is also checked if power system address 213 is set to
Van,Vbn,Vcn,VSy
. Other-
wise, the message
25 Sync. Error
is output. Furthermore, specific thresholds and settings of the selected
function group are checked. If there is a condition which is not plausible, the error message
25 Set-Error
is
output additionally. Please ensure in this case that address 6x06 (threshold V
1
, V
2
energized) is smaller than
address 6x03 (lower voltage limit
Vmin
). The synchronization function cannot be controlled via a binary input.
If the monitoring function Fuse Failure Monitor is used and if it has picked up at the time as the measurement
of the synchronization was requested, the synchronization is not started either (message
25 Sync. Error
).
The same applies if a voltage transformer failure (m.c.b. tripping) is communicated to the device via binary
input 6509
>FAIL:FEEDER VT
or. 6510
>FAIL: BUS VT
. In this case, the synchronization can be
controlled directly via a binary input.
In case of a protection pickup, the complete synchronization process is reset instantaneously.
Operating Range
The operating range of the synchronization function is defined by the configured voltage thresholds
Vmin
and
Vmax
, and the fixed frequency band f
Nom
± 3 Hz.
If measurement is started and one or both voltages are outside the operating range, or one voltage leaves the
permissible range, corresponding messages indicate this behavior (
25 f1>>
,
25 f1<<
,
25 V1>>
,
25 V1<<
,
etc.).
Functions
2.21 Synchronization Function
SIPROTEC 4, 7SJ62/64, Manual
291
C53000-G1140-C207-8, Edition 08.2016
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