Siemens SIPROTEC 7ST6, Руководство пользователя, Страница: 57 / 356

2.2 Distance Protection
57
7ST6 Manual
E50417-G1176-C251-A3
2.2.6 Tripping Characteristic for Manual Reclose
The distance protection zones described in this subsection are only available if the
function
Auto Reclose
is available in the device.
The controlled zone Z1B is usually applied as an overreaching zone. The logic is
shown in Figure 2-9. It may be activated via various internal and external functions.
The binary inputs for external activation of Z1B of the distance protection are
„>BLK
1.AR-cycle“
and
„>BLOCK AR“
. The former can, for example, be from an external
teleprotection device, and only affects Z1B of the distance protection. The latter affects
both overreaching stages. The
Auto Reclose
can also be controlled by an external
protection device. The control signals for this arrive at the binary inputs
„>AR Start“
and
„>Trip for AR“
.
Figure 2-9 Tripping logic of dependent zones
In the initial state, with the
Distance prot.
switched on and the
Auto Reclose
operative, zone Z1B is enabled.
With the function
Auto Reclose
switched off or not operative, zone Z1 is enabled.
Before the 2nd reclosure cycle, the enable for zone Z1B is reset after the dead time
has expired, and the enable for zone Z1L is set with start of the blocking time and the
CLOSE command. The pickup starts all action times which are enabled for initiation.
When the 1st action time has expired but the 2nd action time is still running, the zone
enabling switches from zone Z1B to zone Z1L. An exception to this is the last reclosure
cycle. If all reclosure attempts were unsuccessful, zone Z1 is enabled prior to the last
configured reclosure cycle.
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