ABB RELION REX640 Technical Manual page 1008

Protection and control

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Protection functions

Figure 560: Operating region for out of step with double blinder

A third zone, Zone 3, can be enabled by setting

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

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

is "Way out" or "Adaptive".

An impedance is only considered to be within the mho circle if it is also

between the inner blinders.

Min Ps Seq .

Zone 3 enable to "Yes". Zone 3 is

shows the three zones. Settings that

Oos operation mode setting option

1MRS759142 F

Technical Manual