R
X
Underexcitation Protection
Restrain area
Z1, Fast zone
Z2, Slow zone
IEC06000455-2-en.vsd
Underexitation protection
Restrain area
Directional
blinder
R
IEC06000455 V2 EN-US
Figure 209: Three characteristics in LEXPDIS (40) protection
When the apparent impedance reaches the zone Z1 this zone will operate, normally with a short
delay. The zone is related to the dynamic stability of the generator.
When the apparent impedance reaches the zone Z2 this zone will operate, normally with a longer
delay. The zone is related to the static stability of the generator.
LEXPDIS (40) protection also has a directional blinder (supervision). See figure
209.
In LEXPDIS (40) function the zone measurement is done as shown in figure
210.
Section 7 1MRK 502 066-UUS B
Impedance protection
392
Technical manual
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