Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 59 replies
  • Subscribers 32 subscribers
  • Views 4983 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

High 3rd harmonic on the neutral

MS01
Afternoon,

I was wondering if anyone has nay experiences of having issues with high 3rd harmonic currents on the neutral on high-rised residential schemes? I appreciate  non-linear single phase loads will impact the 3rd harmonic and even on a balanced system harmonics are an issue but we are measuring it at 300% but I can’t think why this may be the case on a residential building.

Does anyone have any ideas?



M
Parents
  • 0
    If you have a laptop with a microphone input, you can feed it a suitably isolated and attenuated version of the waveform from a current transformer (the clip on kind made for energy monitors and variants on the theme), and there are a number of audio oscilloscope and spectrum analyzer programs that can show waveform and spectral views.

    Not perhaps for the faint of heart or those in a hurry, but not too hard to do on a bench top type set up rather than hand held.


    example clamp    you need to add your own load resistor and voltage divider before feeding it into the line input !

    example software. There are others.

Reply
  • 0
    If you have a laptop with a microphone input, you can feed it a suitably isolated and attenuated version of the waveform from a current transformer (the clip on kind made for energy monitors and variants on the theme), and there are a number of audio oscilloscope and spectrum analyzer programs that can show waveform and spectral views.

    Not perhaps for the faint of heart or those in a hurry, but not too hard to do on a bench top type set up rather than hand held.


    example clamp    you need to add your own load resistor and voltage divider before feeding it into the line input !

    example software. There are others.

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines