Siemens Siprotec 7VK61 Manual page 89

For switching under non-asynchronous conditions, you can also set a delay T SYNC-STAB (address 3508)
during which the voltage conditions must at least be satisfied before closing is released.
Synchronism conditions for automatic reclosure
Addresses 3510 to 3519 are relevant to the check conditions before automatic reclosure of the circuit breaker.
When setting the parameters for the internal automatic reclosing function (Section 2.2.2), it is decided with
which automatic reclosing cycle synchronism and voltage check should be carried out.
Address 3510 Op.mode with AR determines whether closing under asynchronous system conditions is
allowed for automatic reclosure. Set this parameter to with T-CB close to allow asynchronous closing; the
relay will then consider the circuit breaker closing time before determining the correct instant for the close com-
mand. Remember that closing under asynchronous system conditions is allowed only if the circuit breaker
closing time is set correctly (see above under „Preconditions")! If you wish to permit automatic reclosure only
under synchronous system conditions, set this address to w/o T-CB close.
The permissible difference between the voltages is set in address 3511 AR maxVolt.Diff. 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 permissible frequency difference between the voltages is set in address 3512 AR maxFreq.Diff, the
permissible phase angle difference in address 3513 AR maxAngleDiff.
The further release conditions for automatic reclosing are set at addresses 3515 to 3519.
The following addresses mean:
3515 AR SYNC-CHECK
3516 AR Usy1<Usy2>
3517 AR Usy1>Usy2<
3518 AR Usy1<Usy2<
3519 AR OVERRIDE
The five possible release conditions are independent from each other and can be combined.
Synchronism conditions for manual closure and control command
Addresses 3530 to 3539 are relevant to the check conditions before manual closure and closing via control
command of the circuit breaker. When setting the general protection data (Power System Data 2, Section
2.1.5.1) it was already decided at address 1151 whether synchronism and voltage check should be carried out
before manual closing. With the following setting in address MAN. CLOSE = w/o Sync-check, no checks are
performed before manual closing.
For commands through the integrated control (local, DIGSI, serial interface), address 3509 SyncCB deter-
mines whether synchronism checks will be performed or not. This address also informs the device to which
switching device of the control the synchronising request refers. You can select from the switching devices
which are available for the integrated control. Choose the circuit breaker to be operated via the synchronism
check. This is usually the circuit breaker which is operated in case of manual closing or automatic reclosure. If
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
both measuring points U
sy1
Thr., address 3503); the synchronism conditions are checked, i.e. AR
maxVolt.Diff (address 3511), AR maxFreq.Diff (address 3512) and
AR maxAngleDiff (address 3513). This parameter can only be altered
with DIGSI under Additional Settings;
must be de-energised (Dead Volt. Thr.,
the measuring point U
sy1
address 3502), measuring point U
Thr., address 3503) ;
must be energised (Live Volt. Thr., address
the measuring point U
sy1
3503), measuring point U
address 3502);
both measuring points U
sy1
Thr., address 3502);
automatic reclosure is released without any check.
2.4 Synchronism and voltage check (optional)
must be energised (Live Volt.
and U
sy2
must be energised (Live Volt.
sy2
must be de-energised (Dead Volt. Thr.,
sy2
must be de-energised (Dead Volt.
and U
sy2
Functions
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