GUID-3C167F6E-E0BF-4AC6-B059-7FBFE5AAD307 V1 EN
Figure 342: 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 current and the rated positive-sequence voltage.
Figure 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”.
Section 4 1MAC059074-MB A
Protection functions
688 615 series ANSI
Technical Manual
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