2 Functions
320
7SD5 Manual
C53000-G1176-C169-1
The permissible magnitude difference of the voltages is set at address 3511 Max.
Volt. Diff. The setting is applied in Volts secondary. This value can be entered as
a primary value when parameterizing with a PC and DIGSI
®
. Depending on the con-
nection of the voltages these are phase-to-earth voltages or phase-to-phase voltages.
The permissible frequency difference between the voltages is set at address 3512
Max. Freq. Diff, the permissible phase angle difference at address 3513 Max.
Angle Diff.
The further release conditions for automatic reclosing are set at addresses 3515 to
3519.
The following addresses mean:
3515 SYNC-CHECK The busbar (UBus) and the feeder (ULine) must both
be live (Live Volt. Thr., address 3503); the con-
ditions for synchronism are checked, i.e. Max. Volt.
Diff (address 3511), Max. Freq. Diff (address
3512) and Max. Angle Diff (address 3513)). This
parameter can only be altered with DIGSI
®
under Ad-
ditional Settings;
3516 Usync> U-line< The busbar (UBus) must be live (Live Volt. Thr.,
address 3503), the feeder (ULine) must be dead
(Dead Volt. Thr., address 3502);
3517 Usync< U-line> The busbar (UBus) must be dead (Dead Volt.
Thr., address 3502), the feeder (ULine) must be live
(Live Volt. Thr., address 3503);
3518 Usync< U-line< The busbar (UBus) and the feeder (ULine) must both
be dead (Dead Volt. Thr., address 3502);
3519 OVERRIDE Automatic reclosure is released without any check.
The five possible release conditions are independent from each other and can be
combined.
Synchronism
Check Conditions
before Manual
Closing
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 pro-
tection 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 MAN. CLOSE = w/o Sync-check, no
checks are performed before manual closing.
Address 3509 SyncCB determines for commands via the integrated control function
(local, DIGSI, serial interface) whether synchronism check is carried out or not. This
address also tells the device for which switching device of the control the synchronism
check applies. 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 synchronism 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 „Pre-
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