Siemens siprotec 7SA522 User Manual

2 Functions
250
7SA522 Manual
C53000-G1176-C155-3
ficient synchronism exists. This is applicable on condition that either the internal syn-
chronism and voltage check function is available or that an external device is available
for synchronism check. If only single-pole reclose cycles are executed or no stability
problems are expected during three-pole dead times (e.g. due to closely meshed net-
works or in radial networks), set address  to 12.
Addresses  and  are only significant if the voltage-controlled adaptive dead
time is used. Set under address  8OLYH! the limit voltage phase–earth above
which the line is considered to be fault-free. The setting must be smalIer than the
lowest expected operating voltage. The setting is applied in Volts secondary. This
value can be entered as a primary value when parameterizing with a PC and DIGSI
®
.
Address  78VWDEOH determines the measuring time used to determine that
the line is fault free with this return voltage. It should be longer than any transient os-
cillations resulting from line energization.
1st Reclosure
Cycle
If working on a line with adaptive dead time, no further parameters are needed for the
individual reclose cycles here. All the following parameters assigned to the individual
cycles are then superfluous and inaccessible.
Address  $567$57 is only available if the automatic reclosure is config-
ured with action time in the operating mode, i. e. if during configuration of the protec-
tion functions (see Section 2.1.1.2) address  $5FRQWUROPRGH = 3LFNXSZ
7DFW or 7ULSZ7DFW was set (the first setting only applies to three-pole tripping).
It determines whether automatic reclosure should be started at all with the first cycle.
This address is included mainly for the sake of uniformity of the parameters for every
reclosure attempt and is set to <(6 for the first cycle. If several cycles are performed,
you can (at $5FRQWUROPRGH = 3LFNXS) set this parameter and different
action times to control the effectiveness of the cycles. Notes and examples can be
found in section 2.13 at margin heading “Action Times”.
The action time $57$&7,21 (address ) is the time after initiation (fault de-
tection) by any protective function which can start the automatic reclosure function
within which the trip command must appear. If the command does not appear until
after the action time has expired, there is no reclosure. Depending on the configuration
of the protective functions the action time may also be omitted; this applies especially
when an initiating protective function has no fault detection signal.
Depending on the configured operating mode of the automatic reclosure (address 
$5FRQWUROPRGH) only address  and  (if $5FRQWUROPRGH = ZLWK
75,3) are available or address  to  (if $5FRQWUROPRGH = ZLWK
3,&.83).
If $5FRQWUROPRGH = ZLWK75,3, you can set different dead times for single-
pole and three-pole reclose cycles. Whether single-pole or three-pole tripping takes
place depends solely on the initiating protection functions. Single-pole tripping is only
possible of course if the device and the corresponding protective function are also
capable of single-pole tripping.
Table 2-8 AR control mode = with TRIP...
If only single-pole reclosure cycles are required, set the dead time for three-pole trip-
ping to ∞. If only three-pole reclosure cycles are required, set the dead time for single-
pole tripping to ∞; the protection then trips three-pole for every fault type.
3456 1.AR Tdead1Trip is the dead time after 1-pole tripping,
3457 1.AR Tdead3Trip is the dead time after 3-pole tripping,

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English