Mains Electric Noise Frequency in UK

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    Electric Mains Noise
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Discussion Overview

The discussion revolves around the frequency of mains electric noise in the UK, exploring the various frequencies present, including the primary frequency and its harmonics, as well as the impact of different electrical systems and devices on the noise spectrum. The scope includes technical explanations and conceptual clarifications regarding electrical noise characteristics.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants propose that both 50Hz and 100Hz frequencies can be found in mains electric noise, with uncertainty about the sources of the 100Hz component.
  • One participant notes that harmonics of the primary frequency will dominate, but emphasizes that switching noise does not have a specific spectrum.
  • Another participant highlights the ambiguity of the term "mains," pointing out that the UK's 3-phase distribution system may lead to different harmonics depending on the phase angles.
  • It is stated that while the mains frequency is 50Hz, the noise on the mains can vary widely due to diverse sources, including narrow pulses.

Areas of Agreement / Disagreement

Participants express differing views on the specific frequencies present in mains electric noise, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

The discussion reveals limitations in defining "mains" and the complexities introduced by the UK's electrical distribution system, which may affect the characteristics of the noise observed.

Mad-
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What is the frequency of mains electric noise in the uk?
 
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It seems to me you will find both 50Hz and to a lesser degree, 100Hz. I'm having difficulty recalling if 100Hz is confined to internal lines where there are more devices employing rectification to DC, with ripple, or if the octave is commonly developed to a small degree within external structures as well.
 
Harmonics of the primary frequency will certainly dominate, but switching noise has no particular spectrum. Total harmonic/distortion spectrum analyzers will give useful indication.
 
Part of the difficulty in answering this question in any definitive way is due to the non-specific nature of the word "mains". The UK, like most well-developed countries employs 3-phase distribution on some legs of the "pipeline" but at some point this gets divided and 2-phase is what is common, in some locations for many miles. I suspect the different phase angles will cause different harmonics.
 
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