Functions
2.18 Synchronism and Voltage Check (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
356
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 2.17.2), 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 both measuring points U
sy1
and U
sy2
must be energised (Live Volt.
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;
3516 AR Usy1<Usy2> the measuring point U
sy1
must be de-energised (Dead Volt. Thr.,
address 3502), measuring point U
sy2
must be energised (Live Volt.
Thr., address 3503) ;
3517 AR Usy1>Usy2< the measuring point U
sy1
must be energised (Live Volt. Thr., address
3503), measuring point U
sy2
must be de-energised (Dead Volt. Thr.,
address 3502);
3518 AR Usy1<Usy2< both measuring points U
sy1
and U
sy2
must be de-energised (Dead Volt.
Thr., address 3502);
3519 AR OVERRIDE automatic reclosure is released without any check.
The five possible release conditions are independent of one another 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
2.1.4.1) 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 SYN.MAN.CL = w/o Sync-check, no checks are
performed before manual closing.
Note
If parameter 1151 SYN.MAN.CL is set to with Sync-check or w/o Sync-check, it is recommended to set
the software filter time under DIGSI 4 for the binary input 356 „>Manual Close“ to 50 ms.
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