What is the significance of the Parameter "Load Harmonics Rise" in Accusine Product?

[varad]

Can anyody tell me what is the significance of  "Load Harmonics Rise" in Accusine Prouct? and how exactly it get calculated?

Also what is the acceptable rise?

[FirdousKhan]

Hello the community! Can you help @varad on this topic please?

[Szymon_Hochół]

Could you please specify where exactly you find this parameter?

Installatuion of AHF in the electrical network makes a change in impedance seen from the load (AHF is low impedance vs the source). Because of this, running AHF causes a rise in harmonic currents drawn by non-linear loads. This is why you need to take a sizing factor into consideration when sizing AHF - to compensate this rise. I don't have details about the way this parameter is calculated in AccuSine but I can suppose it is simple comparison between harmonics values before and after the unit is turned on. Very high value of harmonics rise can be a symptom of resonance in the electrical network. You should not allow the harmonics to rise too much in order to protect the loads.

Hope this helps,

BR

[varad]

Hii...BR

Thanks for such informative reply. Please find herewith attachments of AHF Screens for Load Harmonics Rise. Is it the same parameter for which you are talking?

[Szymon_Hochół · Accepted solution]

Hello,

the parameter on your screeen does not look good. As you can see, the filter is injecting some current in order to cancel harmonics (3-6% of its nominal current) but THDi values instead of getting lower become higher. This is because the AHF itself causes high rise in harmonics drawn by the load. 

This is clearly a case for technical support, as it needs further investigation (which harmonic orders precisely became higher, what are the loads etc. etc.) I strongly recommend you contact them. 

[varad]

Hii BR...

Than you very much for discussing over this topic. We will contact to the tech support.

Can you please share any study material related to this?

[Szymon_Hochół]

Unfortunately I don't have any documents to share. This are topics covered during AccuSine trainings.