Metering & Power Quality
Schneider Electric support forum about Power Meters (ION, PowerTag, PowerLogic) and Power Quality from design, implementation to troubleshooting and more.
Posted: 2019-04-27 02:26 AM . Last Modified: 2020-12-02 03:31 AM
Link copied. Please paste this link to share this article on your social media post.
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?
Link copied. Please paste this link to share this article on your social media post.
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
Link copied. Please paste this link to share this article on your social media post.
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.
Link copied. Please paste this link to share this article on your social media post.
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?
Link copied. Please paste this link to share this article on your social media post.
Unfortunately I don't have any documents to share. This are topics covered during AccuSine trainings.
Posted: 2019-08-21 02:29 AM
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
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
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
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.
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.