Figure 560: Operating region for out of step with double blinder
An impedance is only considered to be within the mho circle if it is also
between the inner blinders.
A third zone, Zone 3, can be enabled by setting
Zone 3 enable
to “Yes”. Zone 3 is
defined to include the area outside of the circular mho characteristic but inside the
area that is bound with the magnitude of the minimum positive-sequence current
defined by setting
Min Ps Seq
.
Figure 561
shows the three zones. Settings that
determine the shape of the zones should be coordinated with the settings for
any distance protection functions. The zones and their respective slip counters are
applicable only for Way out operations when the
Oos operation mode
setting option
is “Way out” or “Adaptive”.
Protection functions
1MRS759142 F
1008 REX640
Technical Manual
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