2.13 Synchronism and Voltage Check
147
7ST6 Manual
E50417-G1176-C251-A3
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 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 automatic reclosure only under synchronous system conditions, set this
address to
w/o T-CB close
.
The permissible magnitude difference of the voltages is set in 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
®
.
The permissible frequency difference between the voltages is set in address
3512
Max. Freq. Diff
, the permissible phase angle difference in address
3513
Max.
Angle Diff
.
The further release conditions for automatic reclosing are set in addresses
3515
to
3519
:
The following addresses mean:
3515
SYNC-CHECK
The busbar (URef) 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
Uref>Uline<
The busbar (URef) must be live (
Live Volt. Thr.
,
address
3503
), the feeder (ULine) must be dead
(
Dead Volt. Thr.
, address
3502
);
3517
Uref<Uline>
The busbar (URef) must be dead (
Dead Volt. Thr.
,
address
3502
), the feeder (ULine) must be live (
Live
Volt. Thr.
, address
3503
);
3518
Uref<Uline<
The busbar (URef) 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 of each other and can be com-
bined.
Synchronism Con-
ditions for Manual
Closure and
Control Command
Addresses
3530
to
3539
are relevant to the check conditions before manual reclo-
sure 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 decided in 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.
For commands through the integrated control (local, DIGSI, serial interface), address
3509
SyncSD
determines whether synchro checks will be performed or not. This
address also tells the device to which switching device of the control the synchronizing
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
SyncSD
=
none
here, a CLOSE command via the
integrated control will be carried out without synchronism check.
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