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1760
Users Manual
3-24
3_2.bmp
Overdeviation and Underdeviation
The Over- and Underdeviation parameters give an indication if the signal in a given
aggregation was higher or lower than the nominal voltage.
The formulas according to IEC 61000-4-30 are:
Underdeviation
0=
under
U if
nomsmr
UU >
...
otherwise
%100
...
⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
=
nom
smrnom
under
U
UU
U
Overdeviation:
0=
over
U if
nomsmr
UU <
...
otherwise
%100
...
⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
=
nom
nomsmr
over
U
UU
U
These parameters give additional information for assessing the stability of the voltage.
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