Functions
6-75
7SJ63 Manual
C53000-G1140-C120-1
be in the opposite direction (reverse direction). This method it typically used to deter-
mine the direction of ground connections in an ungrounded system.
Curves
Figure 6-32 illustrates the directional characteristic of the sensitive ground fault detec-
tion function using a complex vector diagram in which the displacement voltage V
0
is
the reference magnitude. Address
is set to
&263+,
, therefore, the current
3I
0real
is calculated and compared with the value set at address
.
The directional
limit lines are perpendicular to 3I
0real
.
Figure 6-32
Directional Lines for cos-
ϕ
Measurement
Measurement
The directional limit lines may be rotated by a correction angle set at address
3+,&255(&7,21
up to ±45°. Therefore, it is possible to increase sensitivity in the
resistive-inductive range with a rotation of –45°, or in the resistive-capacitive range
with a rotation of +45° (see Figure 6-33). If the sin-
ϕ
method is used, the directional
limit lines would be rotated by 90°.
If address
3+,&255(&7,21
is set other than 0°, the angle of the directional
limit line is determined from the sum of the real and reactive components of zero se-
quence power.
Figure 6-33
Directional Lines for cos-
ϕ
Measurement
0 ( 6 6 $ 5 7
& 2 6 3 + ,
3 + , . 2 5 5 ( . 7 8 5
U
E
I E E G E R .
{
I
E E
3I
0
dir. = Value Set at Address 3123
7<3(2)0($685(0(17 = &263+,
V
0
3
I0Real
(resistive)
Forward
Reverse
3I
0reactive (capacitive)
3I
0dir
3I
0
3+,&255(&7,21 =
O
Setting
I
EEw
U
E
I
EEb (
kapazitiv)
induktiv
0(66$57
c o s P H I
3+,.255(.785
I
E E
}
G E R
IE E
}
I
EEw
U
E
I
EEb (kapazitiv)
induktiv
0(66$57
FRV3+,
3+,.255(.7 85
I
E E
G E R
IE E
IEE GER = Einstellwert
)5(,*$%(5,&+7
7<3(2)0($685(0(17 = &263+,
7<3(2)0($685(0(17 = &263+,
3+,&255(&7,21 =
°
3+,&255(&7,21 =
°
Forward
Reverse
Forward
Reverse
3I
0
real
3I
0
real
V
0
V
0
3I0
reactive (capacitive
)
3I
0reactive (capacitive
)
Inductive
Inductive
,GLU
,
,GLU
,
,GLU
= Value Set at Address 3123
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