Psb Timer Setting Guidelines; Figure 125: Reactive Reach Settings - GE MiCOM P40 Technical Manual

P446SV
Resistive reverse (R')

Figure 125: Reactive reach settings

3.6.3

PSB TIMER SETTING GUIDELINES

The Setting PSB Time setting can be calculated as follows:
( )
f
θ − θ ⋅
1 2
∆t =
f
PS
where
angles q and q
● are defined in the following figure
1 2
f is the nominal frequency
●
nom
● f is the maximum Power Swing frequency to be taken into account
PS
Since any power swing with f
swings with f < 0.5Hz Hz need to be considered for Slow Power Swing detection. We recommended setting f
PS
1Hz because this value provides sufficient security margin.
P446SV-TM-EN-1
+jX
Z
R
Z
L
Z
T
Z
S
nom
>= 0.5Hz can be detected by the setting-free delta current algorithm, only power
PS
Chapter 10 - Power Swing Functions
Zone 8
Zone 7
α = ÐZ
T
Resistive forward (+R)
V02751
to
PS
239