It's always hard to get a good Swedish definition on these things when your term gets two hits on google and both seem to come from your text. ;-)

I found this reading which (after only quick review) seems to discuss your subject matter, though I can't tell without more context. You get discussion of my suggestion(s) and reference to IEEE Guidelines, and a section about "Current distortion limits for General Distribution systems." Seems interesting for your question. https://corpwebstorage.blob.core.windows.net/media/36814/und...

Then you can look up IEEE 519 for more fun reading... with this as an example: https://www.engineeringenotes.com/electrical-engineering/har...





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Note added at 9 hrs (2022-12-06 12:33:52 GMT)
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More reading...your term seems to be 'Interharmonics,' Which in power systems is regulated by the same IEEE Guidline (519). I won't make another entry 'cause all these references are cool. This may be more fun that the others. A Swedish definition is at: https://dokodoc.com/energikompetens-en-rapport-frn-svensk-en...


An Eng definition is at: https://ccaps.umn.edu/documents/CPE-Conferences/MIPSYCON-Pap...

Still learning things at my age...

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Note added at 9 hrs (2022-12-06 12:39:15 GMT)
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I found this, too... "Practically "Interharmonics" are explained as Electronics and communications devices in the smart grid can increase a rare, and not well-understood, distortion."

At: https://blog.emerich.in/2019/01/understanding-interharmonics...