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10.3
Operational Measured Values
Operational measured values are assigned to different function groups.
The values can be displayed as primary and secondary values and as percentage values.
The operational measured values are calculated according to the following definition equations:
RMS values
Active power
Apparent power
Reactive power
Power factor
Active power factor
Voltage/Current 3-Phase Function Group
The following table describes the operational measured values of the 3-phase voltage/current function
group.
All protection functions have access to the values.
Table 10-1
Measured Values
I
, I
, I
Phase currents
A
B
C
3I0
Calculated zero-sequence
current
I
Neutral-point phase current
N
V
, V
, V
Phase-to-ground voltages
A
B
C
V
, V
, V
Phase-to-phase voltage
AB
BC
CA
V
Calculated zero-sequence
0
voltage
V
Measured neutral-point
N
displacement voltage
f
Frequency
P
Active power
(total power)
Q
Reactive power
(total power)
S
Apparent power
(total power)
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
n
Harmonic order
φ
The angle difference between the voltage and current of the nth harmonic
n
Operational Measured Values of the Voltage/Current 3-Phase Function Group
Primary
A
A
A
kV
kV
kV
kV
Hz
MW
Mvar
MVA
Measured Values, Energy Values, and Supervision of the Primary System
Secon-
% Referenced to
dary
A
Rated operating current of the primary values
A
Rated operating current of the primary values
A
Rated operating current of the primary values
V
Rated operating voltage of primary values/√3
V
Rated operating voltage of the primary values
V
Rated operating voltage of primary values/√3
V
Rated operating voltage of primary values/√3
Hz
Rated frequency
–
Active power of the primary values
√3 · V
· I
rated
–
Reactive power of the primary values
√3 · V
· I
rated
–
Apparent power of the primary values
√3 · V
· I
rated
10.3 Operational Measured Values
rated
rated
rated
1311
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