Siemens SIPROTEC 7SJ62 Instruction Manual page 215

Curves
Measurement
7SJ62 Manual
C53000-G1140-C121-1
be in the opposite direction (reverse direction). This method it typically used to deter-
mine the direction of ground connections in an ungrounded system.
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
the reference magnitude. Address  is set to &26 3+,, therefore, the current
is calculated and compared with the value set at address  . The directional
3I
0real
limit lines are perpendicular to 3I
U`Q@ÃPAÃH@6TVS@H@IU
0 ( 6 6 $ 5 7
V 3
0
U
E
Forward
3I {
0dir
I E E G E R .
3I
0reactive (capacitive)
Reverse
QCDÃ8PSS@8UDPI 
=
3 + , . 2 5 5 ( . 7 8 5
Figure 6-32 Directional Lines for cos-ϕ 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.
U`Q@ÃPAÃH@6TVS@H@IU
0 ( 6 6 $5 7
V
3I real
0
I
E E w
Forward
"D
3I0
I
ka p a z itiv)
reactive (capacitive) E E b ( I
EE
QCDÃ8PSS@8UDPI
=
3 + , . 2 5 5 ( . 7 8 5     ƒ
Figure 6-33 Directional Lines for cos-
.
0real
8PTÃQCD
& 2 6 3 + ,
=
(resistive)
I0Real
Setting
3I
I 0
E E
3I
O
   ƒ
U`Q@ÃPAÃH@6TVS@H@IU
8PTÃQCD
=
co s P H I
0
U
E
"Dqv…
IE E
G E R
3I
I
in d u ktiv
0reactive (capacitive) E E b (
Inductive
Reverse
QCDÃ8PSS@8UDPI
#$
°
3+, . 255 (.7 85   ƒ
, GLU = Value Set at Address 3123
AS@DB67@ ÃSD8CU
IEE GER = Einstellwert
ϕ
Measurement
dir. = Value Set at Address 3123
0
8PTÃQCD
0 ( 6 6 $5 7 F R V 3 +,
=
3I real
V
0
0
I
U
E E w
E
Forward
"Dqv…
IE E
G E R
"D
I
E E
ka p a z itiv)
Reverse
#$
°
=
Functions
is
0
Inductive
in d u ktiv
6-75