Siemens siprotec 7SA522 User Manual page 333

General
7SA522 Manual
C53000-G1176-C119-2
 5DWHG )UHTXHQF\ the operating range of the synchronism check is: rated
and, if switching at asynchronous system conditions is allowed,
 7&% FORVH
Warning!
Incorrect synchronization is possible if the closing time of the circuit breaker is not set
correctly under the general power system data (Power system data 1, see Sub-section
6.1.1, address  ).
The synchronism and voltage check function can only operate if it was configured as
HQDEOHG during setting of the scope of functions (see Section 5.1, address ).
Different interrogation conditions can be parameterized for automatic reclosure on the
one hand and for manual closure on the other hand.
The general limit values for closure are set under addresses  to . Addition-
ally, addresses  to  are relevant for automatic reclosure, addresses 
to  are relevant for manual closure.
The complete synchronism and voltage check function is switched Off or On under
address  )&7 6\QFKURQLVP. The close command is not released when the
function is switched off
.
The voltage below which the line or bus-bar is safely regarded as being dead, is set
under address  'HDG 9ROW 7KU (for de-energized line or bus-bar check).
Setting is applied in volts secondary; when operating the device from a personal com-
®
puter using DIGSI 4, setting may be in secondary or primary values. Depending on
the connection of the bus-bar voltage (phase–phase or phase–earth) the phase–
phase or the phase–earth voltage is decisive.
The voltage above which the feeder or bus-bar is regarded as being definitely live, is
set under address  /LYH 9ROW 7KU (for energized line or bus-bar check and
for the lower limit of synchronism check). It must be set below the minimum expected
operating voltage under normal conditions. Setting is in volts secondary; when oper-
ating the device from a personal computer using DIGSI
ary or primary values. Depending on the connection of the bus-bar voltage (phase–
phase or phase–earth) the phase–phase or the phase–earth voltage is decisive.
The maximum permissable voltage for the operating range of the synchronism and
voltage check function is set under address  8PD[. Setting is in volts secondary;
when operating the device from a personal computer using DIGSI
in secondary or primary values. Depending on the connection of the bus-bar voltage
(phase–phase or phase–earth) the phase–phase or the phase–earth voltage is deci-
sive.
Address  76<1 '85$7,21 determines the period of time, starting from the
measurement request (i.e. from the close command), within which the synchronism-
check conditions must be fulfilled. When the conditions are not fulfilled within this time,
closing is blocked. When set to ∞ the conditions will always be checked until they are
fulfilled.
If the conditions for synchronous operation must be checked to be maintained for a
certain duration, this minimum duration can be set under address  7 6<1&
67$%.
frequency ± 3 Hz;
the closing time of the circuit breaker.
Functions
®
4, setting may be in second-
®
4, setting may be
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