2 Functions
34
7SA522 Manual
C53000-G1176-C155-3
The setting /RJLFQR switches this function to the French specification. This
setting is available in the device variants for the region France (only version
7SA522*-**D** or 10th digit of order number = D).
At Address %DFN8S2& you can select the type of characteristic which the time
overcurrent protection uses for operation. In addition to the definite time overcurrent
protection, an inverse time overcurrent protection may be configured depending on
the ordered version. The latter operates either according to an IEC-characteristic (72&
,(&) or an ANSI-characteristic (72&$16,). For the characteristics please refer to the
Technical Data. You can also disable the time overcurrent protection ('LVDEOHG).
At address (DUWK)DXOW2& you can select the type of characteristic which
the earth fault protection uses for operation. In addition to the definite time overcurrent
protection, which provides up to three stages, an inverse-time earth fault protection
function may be configured depending on the ordered version. The latter operates
either according to an IEC-characteristic (72&,(&) or an ANSI-characteristic (72&
$16,) or according to a logarithmic-inverse characteristic (72&/RJDULWKP). If an
inverse-time characteristic is not required, the stage usually designated “inverse time”
can be used as the fourth definite-time stage ('HILQLWH7LPH). Alternatively, it is
possible to select an earth fault protection with inverse-time characteristic 8
LQYHUVH (only for region German, 10th digit of the ordering code = A) or a zero-se-
quence power protection 6ULQYHUVH (only for region French, 10th digits of ordering
code = D). For the characteristics please refer to the Technical Data. You can also
disable the earth fault protection ('LVDEOHG).
When using the earth fault protection, it can be complemented by teleprotection
schemes. Select the desired scheme at address 7HOHSURW(). You can
select the direction comparison scheme 'LU&RPS3LFNXS, the unblocking scheme
81%/2&.,1* and the blocking scheme %/2&.,1*. The procedures are described in
detail in Section 2.8. If the device features a protection data interface for communica-
tion via a digital link, set 6,*1$/Y3URW,QW here. If you do not want to use telepro-
tection in conjunction with earth fault protection set 'LVDEOHG.
Address 3,17(5)$&( and, where required, address 3,17(5)$&(
are also valid for communication of the teleprotection for earth fault protection via
teleprotection interface, as described above.
If the device features an automatic reclosing function, address and are of im-
portance. If no automatic reclosing function is desired for the feeder at which 7SA522
operates, or if an external device is used for reclosure, set address $XWR
5HFORVH to 'LVDEOHG. Automatic reclosure is only allowed on overhead lines. It
should not be used in any other case. If the protected object consists of a mixture of
overhead lines and other equipment (e.g. overhead line in block with a transformer or
overhead line/cable), it must be ensured that reclosure can only be performed in the
event of a fault on the overhead line.
Otherwise set the number of desired reclosing attempts there. You can select $5
F\FOH to $5F\FOHV. You can also set $'7 (adaptive dead times). In this case the
behaviour of the automatic reclosing function is determined by the cycles of the
remote end. The number of cycles must however be configured at least in one of the
line ends which must have a reliable infeed. The other end — or other ends, if there
are more than two line ends — may operate with adaptive dead time. Section 2.13 pro-
vides detailed information on this topic.
The $5FRQWUROPRGH at address allows a maximum of four options. Firstly, it
can be determined whether the auto-reclose cycles are carried out according to the
fault type detected by pickup of the starting protective function(s) (only three-pole trip-
ping), or according to the type of trip command. Secondly, the automatic reclosing
function can be operated with or without action time.
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