VEGA78
EN - 23
5.2.3. HARM analysis screens
Starting from any page of numerical values it’s possible to enter harmonics numerical
values and histogram graphics screens section for voltage and current input signals by
pressing
F2
key (or touch
HARM
at display). By pressing cyclically
F1
key the below
screens are shown by meter.
As an example, below are shown the screens relative to a
three phase 4-wire system
. Similar
consideration can be applied to any other selected system.
Harmonics values of V1, V2, V3 voltages and neutral voltage Vn (for three phase 4-
wire system), currents I1, I2, I3 and neutral current In (for three phase 4-wire system)
with THD% values both with histogram graphics and with numerical values in
percentage or absolute value, (see § 5.3.2.3 as below shown. The
positive
value
means the condition of
absorbed
harmonics (mains
loads direction) while the
negative
value means the condition of
generated
harmonics (loads
mains direction)
Fig. 32: Harmonic analysis of voltages in percentage value for 4-wire systems
In all case the full scale of graphs is automatically set from meter depending on measured
values.
Change to currents screens by pressing
F2
key (or touch “
HARM I
” at display). By
pressing
F1
key (or the
PAGE
at display) the screens of total values and each phase
currents I1, I2, I3 and In (for 4-wire and single phase systems)
.
The main screens are
below shown:
Fig. 33: Harmonic analysis of currents percentage/absolute for 4-wire systems
Change to screens of numerical values tables of harmonics voltages and currents up to
64
st
both percentage and absolute value (see § 5.3.2.3) by pressing
F3
key (or touch
“
TABLE
” at display), as shown in below pictures:
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