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7.3.7
Operation principle
The Loss of excitation (LEXPDIS ,40) protection in the IED measures the apparent
positive sequence impedance seen out from the generator.
Measured mode
Measured apparent impedance
Z
posseq
posseq
posseq
V
I
=
EQUATION2051-ANSI V1 EN
(Equation 39)
There are three characteristics in LEXPDIS (40) protection as shown in figure
.
Naimly:
•
Offset mho circle for Z1
•
Offset mho circle for Z2
•
Directional blinder
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
Figure 71:
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.
Section 7
1MRK 502 048-UUS A
Impedance protection
170
Technical manual
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