Siemens SIPROTEC 7SJ62 - Page 309

Functions
6-1697SJ62 Manual
C53000-G1140-C121-1
The displacement voltage is either measured directly or calculated from the phase-to-
ground voltages:
V
gn
= 3V
0
/(V
ph
/ V
gnTRA
)with:
3V
0
= (V
a
+ V
b
+ V
c
)
V
ph
/V
gnTRA
= Transformation adjustment for ground
input voltage (setting )
The ground current I
G
is either measured directly or calculated from the conductor cur-
rents:
I
G
= 3⋅I
0
/ (I
G
/I
phTRA
)with:
3I
0
= (I
a
+ I
b
+ I
c
)
I
G
/I
phTRA
= Transformation adjustment for ground input
current (setting )
In addition, the following may be available:
− Minimum and maximum values for the three phase currents I
x
; the three phase-to-
ground voltages V
xg
; the three phase-to-phase voltages V
xy
; the positive sequence
components I
1
and V
1
; the real power P, reactive power Q, and apparent power S;
the frequency; and the power factor cos ϕ; primary values. Included are the date
and time they were last updated.
Table 6-7 Operating Measured Values
Measured Values Primary Secondary % of
I
a
, I
b
, I
c
Phase Currents A A
Nominal Operating Current
1
)
I
G
Ground Current A A
Nominal Operating Current
1
)
3I
0
Ground Current A A
Nominal Operating Current
1
)
I
1
, I
2
Positive and Negative Sequence
Components of Current
AA
Nominal Operating Current
1
)
I
Ns
Sensitive Ground Current A mA -----
V
ab
, V
bc
, V
ca
Phase-to-Phase Voltages kV V
Nominal Operating Voltage
2
)
V
ag
, V
bg
, V
cg
Phase-to-Ground Voltages kV V
Nominal Operating Voltage/√3
2
)
V
gn
Displacement Voltage kV V
Nominal Operating Voltage
2
)
3V
0
Displacement Voltage kV V
Nominal Operating Voltage⋅√3
2
)
V
1
, V
2
Positive and Negative Sequence
Components of Voltage
kV V
Nominal Operating Voltage/√3
2
)
S, P, Q Complex, Real, Reactive Power MVA, MW,
MVAR
VA, W,
VAR
√3 ⋅V
N
⋅I
N
Nominal Operating
Quantities
1
)
2
)
Cos ϕ Power Factor (abs) -- -----
f Frequency Hz -- -----
1
) per address  (see Subsection 6.1.3)
2
) per address  (see Subsection 6.1.3)
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