Functions
6-186
7SA522 Manual
C53000-G1176-C119-2
Synchronism
check conditions
before automatic
reclosure
Addresses
are relevant to the check conditions before automatic
reclosure of the circuit breaker. When setting the parameters for the internal
automatic reclosing function (Section 6.11.2) it is decided with which automatic
reclosing cycle synchronism and voltage check should be carried out.
Address
determines whether closing under asynchronous
system conditions is allowed. Set this parameter to
, if asynchro-
nous closing shall be allowed; the relay will then consider the circuit breaker closing
time before determining the correct instant for the closing 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 au-
tomatic reclosure only under synchronous system conditions, set this address to
The permissible magnitude difference of the voltages is set under address
. Setting is in volts secondary; when operating the device from a person-
al computer using DIGSI
®
4, setting may be in secondary or primary values. Depend-
ing 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
, the permissible phase angle difference under address
The further release conditions for automatic reclosing are set under addresses
:
= synchronism check: the bus-bar (Ubus) and the
feeder (Uline) must both be live (
, address
); the conditions for synchro-
nism
(address
),
(address
), and
(address
) are checked before automatic
reclosure;
= dead-line check: the bus-bar (Ubus) must be live
(
, refer to address
), the
feeder (Uline) must be dead (
refer to address
= dead-bus check: the bus-bar (Ubus) must be dead
(
, refer to address
), the
feeder (Uline) must be live (
fer to address
= dead-bus and dead-line check: the bus-bar (Ubus)
and the feeder (Uline) must both be dead (
, refer to address
);
automatic reclosure is released without any check.
The five possible release conditions are independent of each other and can be com-
bined.
Synchronism
check conditions
before manual
closing
The release conditions for manual closing are set under addresses
to
.
When setting the general protection data (Power System Data 2, Section 6.1.3) it was
decided whether synchronism and voltage check should be carried out before manual
closing. With the following setting in address
=
, no checks are performed before manual closing. The following parameters are
then irrelevant.
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