GE MiCOM P40

V02751
Zone 8
Zone 7
Resistive forward (+R)Resistive reverse (R’)
+jX
α = ÐZ
T
Z
T
Z
S
Z
L
Z
R
Figure 125: Reactive reach settings
3.6.3
PSB TIMER SETTING GUIDELINES
The Setting PSB Time setting can be calculated as follows:
∆t
f
f
nom
PS
=
− ⋅( ) θ θ
1 2
where
●
angles q
1
and q
2
are defined in the following figure
● f
nom
is the nominal frequency
● f
PS
is the maximum Power Swing frequency to be taken into account
Since any power swing with f
PS
>= 0.5Hz can be detected by the setting-free delta current algorithm, only power
swings with f
PS
< 0.5Hz Hz need to be considered for Slow Power Swing detection. We recommended setting f
PS
to
1Hz because this value provides sufficient security margin.
P446SV Chapter 10 - Power Swing Functions
P446SV-TM-EN-1 239