Functions
2.5 Distance Protection
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
178
Figure 2-73 Tripping logic for the 3rd zone
Figure 2-74 Tripping logic for the 4th, 5th und 6th zone, shown is zone Z4
Zone logic of the controlled zone Z1B
The controlled zone Z1B is usually applied as an overreaching zone. The logic is shown in Figure 2-75. It may
be activated via various internal and external functions. The binary inputs for external activation of Z1B of the
distance protection are „>ENABLE Z1B“ and „>Enable ARzones“. The former can, for example, be from
an external teleprotection device, and only affects Z1B of the distance protection. The latter can also be con-
trolled, e.g. by an external automatic reclosure device. In addition, it is possible to use zone Z1B as a rapid
autoclosure stage that only operates for single-pole faults, for example, if only single-pole automatic reclose
cycles are to be executed.
It is possible for the 7SD5 to trip single-pole during two-phase faults without earth connection in the overreach-
ing zone when single-pole automatic reclosure is used.
As the device features an integrated teleprotection function, release signals from this function may activate
zone Z1B provided that the internal teleprotection signal transmission function has been configured to one of
the available schemes with parameter 121 Teleprot. Dist., i.e., the function has not been set to
Disabled). If the integrated AR function is activated, zone Z1B can be released in the first AR cycle provided
that parameter 1657 1st AR -> Z1B is set accordingly.
If the distance protection is operated with one of the teleprotection schemes described in 2.7, the signal trans-
mission logic controls the overreaching zone, i.e. it determines whether a non-delayed trip (or delayed with
T1B) is permitted in the event of faults in the overreaching zone (i.e. up to the reach limit of zone Z1B) at both
line ends. Whether the automatic reclosure device is ready for reclosure or not is irrelevant since the telepro-
tection function ensures the selectivity over 100% of the line length and fast tripping.
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