Functions
2.18 Synchronism and Voltage Check (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
357
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
you set SyncCB = none here, a CLOSE command via the integrated control will be carried out without syn-
chronism check.
Address 3530 Op.mode with MC determines whether closing under asynchronous system conditions is
allowed for manual closing or reclosure via control command. 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 command. 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 manual closure or closing via control command only under synchronous system conditions, set this
address to w/o T-CB close.
The permissible difference between the voltages is set in address 3531 MC 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 at address 3532 MC maxFreq.Diff, the
permissible phase angle difference at address 3533 MC maxAngleDiff.
The further release conditions for manual reclosing or reclosure via control command are set under addresses
3535 to 3539.
The following addresses mean:
3535 MC SYNCHR both measuring points U
sy1
and U
sy2
must be energised (Live Volt.
Thr., address 3503); the synchronism conditions are checked i.e. MC
maxVolt.Diff (address 3531), MC maxFreq.Diff (address 3532) and
MC maxAngleDiff (address 3533). This parameter can only be altered in
DIGSI at Display Additional Settings;
3536 MC 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) ;
3537 MC 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);
3538 MC Usy1< Usy2< both measuring points U
sy1
and U
sy2
must be de-energised (Dead Volt.
Thr., address 3502);
3539 MC OVERRIDE manual closing or closing via control command is released without any
check.
The five possible release conditions are independent of one another and can be combined.
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