Table. 5.2.1 - 23. Harmonic current measurements.
Name
Range
Step Default
Description
Harmonics
calculation values
("Harm Abs.or
Perc.")
-
0: Percent
1:
Absolute
-
0:
Percent
Defines whether the harmonics are calculated as percentage or
absolute values.
Harmonics display
-
0: Per unit
1: Primary
A
2:
Secondary
A
-
0: Per
unit
Defines how the harmonics are displayed: in p.u values, as primary
current values, or as secondary current values.
Maximum
harmonics value
("Ixx maximum
harmonic")
A 0.00...100
000.00
0.01
-
Displays the maximum harmonics value of the selected current
input ILx or I0x.
Fundamental
frequency
("Ixx fundamental")
A 0.00...100
000.00
0.01
-
Displays the current value of the fundamental frequency (RMS)
from the selected current input ILx or I0x.
Ixx harmonics
(2
nd
...31
st
harmonic)
A 0.00…100
000.00
0.01
-
Displays the selected harmonic from the current input ILx or I0x.
5.2.2 Voltage measurement and scaling
The voltage measurement module (VT module, or VTM) is used for measuring the voltages from
voltage transformers. The measured values are processed into the measurement database and they
are used by measurement and protection functions (the protection function availability depends of the
relay type). It is essential to understand the concept of voltage measurements to be able to get correct
measurements.
Figure. 5.2.2 - 66. Voltage measurement terminology
PPRI:
RI: The primary voltage, i.e. the voltage in the primary circuit which is connected to the primary side of
the voltage transformer.
SEC:
SEC: The secondary voltage, i.e. the voltage which the voltage transformer transforms according to the
ratio. This voltage is measured by the protection relay.
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
67
