what is THD and how to calculate THD in three phase power

[saudrehman]

calculate thd

hi guys,
i am writing a code for measuring THD(total harmonic distortion) in a three phase power meter.can anyone explain what is THD and upto how many harmonics can be measured ?
i want measurement upto 41st harmonic

 

[v_c]

how to calculate thd

Here's a pretty good definition of total harmonic distortion

https://en.wikipedia.org/wiki/Total_harmonic_distortion

The Fluke 430 claims to be able to track up to the 50th harmonic

http://us.fluke.com/usen/products/features.htm?cs_id=34651(FlukeProducts)&category=PHASE3(FlukeProducts)

Best regards,
v_c

 

[smalandr]

Re: how to calculate thd

Here's a pretty good definition of total harmonic distortion

Total harmonic distortion - Wikipedia, the free encyclopedia

The Fluke 430 claims to be able to track up to the 50th harmonic

Fluke 430 Series Three-Phase Power Quality Analyzers)

Best regards,
v_c

Hello,
any ideas how to do the same in Matlab ??
From the frequency response of the FFT, write a script that identifies the harmonics and calculate the THD ....
Any ideas ?
Many thanks.
Stef