Siemens siprotec 7SA6 User Manual page 128

Configuration
5-4
load operation (including tolerable overloading), set address  'LV 3,&.83 =
,! RYHUFXUU (overcurrent pickup, Subsubsection 6.2.2.1). If the voltage drop is
also required as pickup criterion, select 8, (voltage-controlled overcurrent pickup,
Subsubsection 6.2.2.2). For HV and EHV lines address setting 8, SKL! (voltage
& phase-angle dependent current pickup, see Subsubsection 6.2.2.3) may be
needed. For the impedance starting the larges-set R-Zones and X-Zones of the
distance zones form the pickup criteria. If the  'LV 3,&.83
set, the Distance Protection function and all functions related to it are not available.
Please take into consideration that the power swing supplement (refer also to Section
6.3) can only operate in conjunction with the impedance starting. Otherwise the
supplement is disabled, even if address  3RZHU 6ZLQJ is set to (QDEOHG
If the Distance Protection is to be supplemented with a teleprotection system, the
desired scheme can be selected in address  7HOHSURW 'LVW. The following
schemes are available: the permissive underreach transfer scheme via pickup 3877
3LFNXS and via the permissive overreach transfer scheme 3277, the signal
comparison scheme VLJQDO FRPSDULVRQ, the 'LU&RPS3LFNXS scheme, the
81%/2&.,1* scheme, the %/2&.,1* scheme as well as the schemes via Pilot wire
comparison (3LORW ZLUH FRPS) and reverse interlocking 5HY ,QWHUORFN
These schemes are described in detail in Subsection 6.4.1. If the teleprotection
supplement is not required for the distance protection, the setting must be 'LVDEOHG.
The tripping characteristic group of the time delayed overcurrent protection can be set
in address  %DFNXS RYHUFXUUHQW %DFN8S 2& . In addition to the definite
time overcurrent protection (DT), an inverse time overcurrent protection can be
configured in two different ways (depending on the order variant): either
corresponding to the IEC characteristics (72& ,(&), or to the ANSI characteristics
(72& $16,). The various characteristics are shown in the technical data. The time
delayed overcurrent protection may naturally also be disabled ('LVDEOHG).
The tripping characteristic of the earth fault protection can also be selected, in this
case in address  (DUWK IDXOW RYHUFXUUHQW (DUWK )DXOW 2& . In
addition to the definite time overcurrent stage (DT), with up to three sub-stages, it is
also possible (depending on the order variant) to configure an inverse earth fault
stage. This inverse stage may either correspond to the IEC characteristic (72& ,(&)
or to the ANSI characteristic (72& $16,), or to an inverse logarithmic characteristic
(72& /RJDULWKP). If an inverse tripping stage is not required, the stage that is
usually referred to as "inverse" may also be used as a fourth definite time stage
'HILQLWH 7LPH. Alternatively the earth fault protection function controlled by zero
sequence voltage 8 LQYHUVH can be selected. The various characteristics are
shown in the technical data. The earth fault protection may naturally also be disabled
('LVDEOHG).
If the device has an automatic reclosure, the addresses  and  are
significant. If no reclosure is desired at the feeder for which 7SA6 is used or only an
external device is used for reclosure, address  $872 5(&/26( is switched to
'LVDEOHG. Automatic reclosure is only permitted for overhead lines. It may not be
used in any other case. If the protected object consists of a combination of overhead
lines and other equipment (e.g. overhead line in a block with a transformer or
overheadline/cable), reclosure is only permissible if it can be ensured that it can only
take place in the event of a fault on the overhead line.
Otherwise set the number of desired reclosure attempts there. You can select
 $5 F\FOH to  $5 F\FOHV. You can also set $'7 (adaptive dead time): in this
case the behavior of the automatic reclosure depends on the cycles of the remote end.
However, the number of cycles must be set at least at one end of the line and this end
must have a reliable infeed. The other end or ends may operate with adaptive dead
time. See section 6.12.1 for detailed explanations.
'LVDEOHG is
7SA6 Manual
C53000-G1176-C133-1