230
Rated Frequency
the operating range of the synchronism check refers
to the nominal frequency of the power system (f
N
±3
Hz);
1103
FullScaleVolt.
nominal operational voltage of the primary power
system (phase-phase) in kV;
and, if switching under asynchronous system conditions is allowed,
239
T-CB close
the closing time of the circuit breaker.
!
WARNING
Switching under Asynchronous System Conditions!
Closing under asynchronous system conditions requires the closing time of the circuit breaker to be
set correctly in the Power System Data 1 (address 239).
²
Otherwise, faulty synchronization may occur.
General
The synchronism check can only operate if during the configuration of the device scope (address 135) it has
been set to
Enabled
and the parameter
U4 transformer
(address 210) to
Usy2 transf.
.
The measured values of the synchronism check (636
Udiff =
, 637
Usy1=
, 638
Usy2=
, 647
F-diff=
, 649
F-sy1 =
, 646
F-sy2 =
and 648
φdif=
) are only available if the synchronism check is in service.
Different interrogation conditions can be parameterized for automatic reclosure on the one hand and for
manual closure on the other hand. Each closing command is considered a manual reclosure if it was initiated
via the integrated control function or via a serial interface.
The general limit values for synchronism check are set at address 3501 to 3508. Additionally, addresses 3510
to 3519 are relevant for automatic reclosure, addresses 3530 to 3539 are relevant for manual closure. More-
over, address 3509 is relevant for closure via the integrated control function.
At address 3501
FCT Synchronism
you switch the entire synchronism check function
ON
- or
OFF
. If
switched off, the synchronism check does not verify the synchronization conditions and it finds keine Frei-
gabe. You can also set
ON:w/o CloseCmd
: The CLOSE command is in this case not included in the common
device alarm
Relay CLOSE
(No 510); but the alarm
Sync.CloseCmd
(No 2961) is issued.
Address 3502
Dead Volt. Thr.
indicates the voltage threshold below which the feeder or the busbar can
safely be considered de-energized (for checking a de-energized feeder or busbar). The setting is applied in
Volts secondary. This value can be entered as a primary value when parameterising with a PC and DIGSI.
Depending on the VT connection these are phase-to-earth voltages or phase-to-phase voltages.
Address 3503
Live Volt. Thr.
indicates the voltage above which the feeder or busbar is regarded as
being definitely energized (for energized line or busbar check and for the lower limit of synchronism check). It
must be set below the minimum operational undervoltage to be expected. The setting is applied in Volts
secondary. This value can be entered as a primary value when parameterising with a PC and DIGSI. Depending
on the VT connection these are phase-to-earth voltages or phase-to-phase voltages.
The maximum permissible voltage for the operating range of the synchronism check function is set in address
3504
Umax
. The setting is applied in Volts secondary. This value can be entered as a primary value when
parameterising with a PC and DIGSI. Depending on the VT connection these are phase-to-earth voltages or
phase-to-phase voltages.
Verification of the release conditions via synchronism check can be limited to a configurable synchronous
monitoring time
T-SYN. DURATION
(address 3507). The configured conditions must be fulfilled within this
time. If not, closure will not be released. If this time is set to ∞ , the conditions will be checked until they are
fulfilled or the measurement request is cancelled.
For switching under synchronous conditions you can specify a delay time
T SYNC-STAB
(address 3508).
During this time the voltage criteria must at least be fulfilled before closing is released.
Functions
2.4 Synchronism and voltage check (optional)
90
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Содержание SIPROTEC 4 7VK61
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