Thd Measurements - CARLO GAVAZZI WM5-96 - PROGRAMMING Instruction Manual

Becoming acquainted with WM5 96
6
Measurements of instantaneous variables
a b
d
c
1
2
3

THD Measurements

a
b
c
1
d
e
2
The phase angle
damental and the voltage and current
harmonic of the same order will be displayed
only if the measurements are taken in a three-
phase system with neutral.
The various measuring pages of WM5 96 display the necessary infor-
mation for the quality analysis of the network. To scroll
ing pages, use the "
press the "S" key; to scroll the available details, use the "
(3); to exit the details displaying phase, press the "S" key.
The details for the instantaneous variables are the following:
dmM=
dmd=
max=
min=
For any information on the meaning of "dmd", see page 14.
Reset of details. Keeping the "S" key pressed for approx. 2 seconds,
it's possible to reset each variable of the selected detail (dmM, dmd,
max, min). The instrument displays a message confirming the user he
has entered the reset mode: choose "YES" by means of the "
keys , confirm with the "S" key and then select the variable you want
to reset by means of the "
the reset; to exit the reset mode, keep the "S" key pressed for at least
2 seconds.
Thanks to the powerful calculation capabilities of the ARM® technolo-
gies, WM5 96 allows an accurate analysis of the harmonics up to the
63rd.
a
b
c
An arrow is displayed on the horizontal axis of the graph to identify the
harmonics being examined. To scroll the harmonics one by one, use
the "
d
e
f
f
To exit the display of measurement details, press the "S" key.
Note: The display of histograms is available only up to the 50
monic (h50). For the other harmonics from h51 to h63 only the numer-
ic values are available.
(f) between the fun-
" keys; to display the details of the measures,
maximum dmd value,
dmd value,
maximum value,
minimum value.
Voltage or current value referred to the relevant measured phase.
(V1, V2, V3, A1, A2, A3).
Total harmonic distorsion expressed as a percentage value.
Histogram of the harmonics. To display the details of the harmon-
ics, press the "S" key (2).
" keys (2).
Harmonic order (from h1 to h 63), for single phase and the relevant
absolute voltage or current value.
Harmonic order (from h1 to h63), the detected conventional sign
(-,o,+) and its relevant value expressed as a percentage.
Phase angle between the fundamental and the voltage and current
harmonic of the same order: angle between 0° and 90° and
between 270° and 360° corresponds to a generated harmonic, an
angle between 90° and 180° and between 180° and 270° corre-
sponds to an imported harmonic.
WM5-96 Instruction Manual
(1)
" keys, then press "S" to proceed with
the measur-
" keys
"
h
t har-