Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-39
ST
Setting range
Menu text Default setting Step size
Min. Max.
SEF>3 Direction
Non-directional
Non-directional
Directional Fwd
Directional Rev
N/A
This setting determines the direction of measurement for the third stage element.
SEF>3 Current 0.4 x n
SEF
0.005 x
n
SEF
0.8 x n
SEF
0.001 x n
SEF
Pick-up setting for the third stage sensitive earth fault element.
SEF>3 Delay
1 0 s 200 s 0.01 s
Setting for the operating ird sta time delay for th ge sensitive earth fault element.
SEF>4 Cells as for
SEF>3 Above
SEF> Func. Link
001111
Bit 0=VTS Blks ISEF>1,
Bit 1=VTS Blks ISEF>2,
Bit 2=VTS Blks EF>3, IS
Bit 3=VTS Blks EF>4, IS
Bit 4= A/R Blks ISEF>3,
Bit 5=A/R Blks ISEF>4,
Bit 6=Not Used,
Bit 7=Not Used
Settings that determine whether VT supervision and auto-reclose logic signals blocks
selected sensitive earth fault stages.
ISEF DIRECTIONAL
SEF> Char. Angle
90° –95° +95° 1°
Setting for the relay characteristic angle used for the directional decision.
SEF>VNpol Set
5 0.5 V 88 V 0.5 V
Setting for the minimum zero sequence voltage polarizing quantity required for directio
decision.
nal
WATTMETRIC SEF Sub-heading in menu
PN> tting Se
9n
SEF
W
0
20n
SEF
W 0.05n
SEF
W
Setting for the thresho r the wattmetric c ero sequence r. The
g corresp s to:
Angle between the Polarizing Voltage (-Vres) and the Residual
Vres = Residual Voltage
Residual Current
= Zero Sequence Voltage
ld fo omponent of z powe
power calculation is as follows:
The PN> settin ond
Vres x res x Cos ( – c) = 9 x Vo x o x Cos (– c)
Where; = Current
c = Relay Characteristic Angle (RCA) Setting (SEF> Char Angle)
res =
Vo
o = Zero Sequence Current
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