Siemens SIPROTEC Manual page 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
3536 MC Usy1< Usy2>
3537 MC Usy1> Usy2<
3538 MC Usy1< Usy2<
3539 MC OVERRIDE
The five possible release conditions are independent of one another and can be combined.
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
both measuring points U
sy1
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;
must be de-energised (Dead Volt. Thr.,
the measuring point U
sy1
address 3502), measuring point U
Thr., address 3503) ;
the measuring point U must be energised (Live Volt. Thr., address
sy1
3503), measuring point U
address 3502);
both measuring points U
sy1
Thr., address 3502);
manual closing or closing via control command is released without any
check.
2.18 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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