Siemens siprotec 7SA6, Manual

Page: 413 / 876

Functions
6-223
7SA6 Manual
C53000-G1176-C156-2
Address
3530 Op.mode with MC
determines whether closing under asynchronous
system conditions is allowed. Set this parameter to
with T-CB close
, if asynchro-
nous closing shall be allowed; 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 only per-
mit manual closing under synchronous system conditions, set this address to
w/o T-
CB close
.
The permissible magnitude difference of the voltages is set under address
3531 MC
maxVolt.Diff
. Setting is in volts secondary. When operating the device from a per-
sonal computer using DIGSI
®
4, setting may be in secondary or primary values. De-
pending on the connection of the bus-bar voltage (phase–phase or phase–earth) the
phase–phase or the phase–earth voltage is decisive.
The permissible frequency difference between the voltages is set under address
3532
MC maxFreq.Diff
, the permissible phase angle difference under address
3533 MC
maxAngleDiff
.
The release conditions for manual closing are set under addresses
3535A
to
3539
:
3535A MC SYNCHR
= synchronism check: the bus-bar (Ubus) and the
feeder (Uline) must both be live (
Live Volt.
Thr.
, address
3503
); the conditions for synchro-
nism
MC maxVolt.Diff
(address
3531
),
MC
maxFreq.Diff
(address
3532
), and
MC maxAn-
gleDiff
(address
3533
) are checked before man-
ual closure;
3536 MC Usyn> Uline< =
dead-line check: the bus-bar (Ubus) must be live
(
Live Volt. Thr.
, refer to address
3503
), the
feeder (Uline) must be dead (
Dead Volt. Thr.
,
refer to address
3502
);
3537 MC Usyn< Uline> =
dead-bus check: the bus-bar (Ubus) must be dead
(
Dead Volt. Thr.
, refer to address
3502
), the
feeder (Uline) must be live (
Live Volt. Thr.
, re-
fer to address
3503
);
3538 MC Usyn< Uline<
= dead-bus and dead-line check: the bus-bar (Ubus)
and the feeder (Uline) must both be dead (
Dead
Volt. Thr.
, refer to address
3502
);
3539 MC O/RIDE
= manual closing is released without any check.
The five possible release conditions are independent of each other and can be com-
bined.