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10.4
Fundamental and Symmetrical Components
The fundamental components are calculated from the frequency-tracked instantaneous values through a
Fourier filter (integration interval: one period). The results are phasor values that are described by way of the
amount and phase angle.
In accordance with the transformation matrix, the symmetrical components are calculated from the voltage
and current phasors. These are also phasor quantities.
Fundamental Components
Table 10-2
Values
V
, V
, V
Phase-to-ground voltage
A
B
C
V
Measured neutral-point displace-
N
ment voltage
V
, V
,
Phase-to-phase voltage
12
23
V
31
I
, I
, I
Phase currents
A
B
C
I
Neutral-point phase current
N
Symmetrical Components
Table 10-3
Values
V
Zero-sequence component of the
0
voltage
V
Positive-sequence component of
1
the voltage
V
Negative-sequence component of
2
the voltage
I
Zero-sequence component of the
0
current
I
Positive-sequence component of
1
the current
I
Negative-sequence component of
2
the current
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Fundamental Components
Primary
kV
kV
kV
A
A
Symmetrical Components
Primary
kV
kV
kV
A
A
A
Measured Values, Energy Values, and Supervision of the Primary System
10.4 Fundamental and Symmetrical Components
Secon-
Phase
dary
Angle
V
°
V
°
V
°
A
°
A
°
Secon-
Phase
dary
Angle
V
°
V
°
V
°
A
°
A
°
A
°
% Referenced to
Rated operating voltage of primary
values/√3
Rated operating voltage of primary
values/√3
Rated operating voltage of the
primary values
Rated operating current of the
primary values
Rated operating current of the
primary values
% Referenced to
Rated operating voltage of primary
values/√3
Rated operating voltage of primary
values/√3
Rated operating voltage of primary
values/√3
Rated operating current of the
primary values
Rated operating current of the
primary values
Rated operating current of the
primary values
1313
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