ITech IT8600 Series

Harmonic Measurement Function
Copyright © ITECH Electronic Co., Ltd. 73
Measurement
function
Calculation formula and method
%r
%f
Harmonic distortion
factor of voltage
( )
( )
TotalU
kU
( )
( )
1U
kU
Harmonic distortion
factor of active
power
( )
( )
TotalP
kP
( )
( )
1P
kP
Total harmonic
distortion rate of
voltage
( )
( )
TotalU
kU
k

=
max
2
2
( )
( )
1
max
2
2
U
kU
k

=
Total harmonic
distortion rate of
active power
( )
( )
TotalP
kP
k

=
max
2
( )
( )
1
max
2
P
kP
k

=
NOTE
Total harmonics are calculated as follows:
( ) ( )

=
=
max
0
2
k
kUTotalU
,
( ) ( )

=
=
max
0
2
k
kITotalI
,
( ) ( )

=
=
max
0k
kPTotalP
. k indicates the harmonic order, and max indicates the upper limit of
analysis orders. max is determined by the frequency of PLL source automatically, 50 orders
at most.
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