ITech IT7622 User Manual page 58

ООО "Техэнком" Контрольно-измерительные приборы и оборудование
factor.

%r: use all harmonic measurement data from the minimum harmonic order
th
(0 ) to the maximum harmonic order (within the upper limit of analysis
orders) as the denominator.

%f: using the data of fundamental wave (1-order) components as the
denominator.
The distortion factor calculation formulas and methods of different
measurement functions are as follows:
Measurement
function
Harmonic distortion
factor of voltage
Harmonic distortion
factor of current
Total harmonic
distortion rate of
voltage
Total harmonic
distortion rate of
current
NOTE
Total harmonics are calculated as follows:
indicates the harmonic order, and max indicates the upper limit of analysis orders. 50 orders
at most.
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Calculation formula and method
%r
( )
U k
( )
U Total
( )
I k
( )
I Total
max
( )
∑
2
U k
=
k 2
( )
U Total
max
( )
∑
2
I k
=
k 2
( )
I Total
max
( ) ( )
∑
=
2
U Total U k
=
k 0
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Harmonic Function
%f
( )
U k
( )
U 1
( )
I k
( )
I 1
max
( )
∑
2
U k
=
k 2
( )
U 1
max
( )
∑
2
I k
=
k 2
( )
I 1
max
( ) ( )
∑
=
2
I Total I k
=
，
k 0 . k
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