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Forum Index : Electronics : Toroidal Transformer Idle power

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Solar Mike
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Joined: 08/02/2015
Location: New Zealand
Posts: 1242
Posted: 04:04am 21 Aug 2026
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Got a reply back from the NZ transformer manufacture.

..."We anneal our GOSS cores at 800°C. We control the temperature up, soak, then control the temperature down so there is no thermo-shock.

We haven't had particularly good results re-annealing cores; they do not generally improve performance (from a current transformer accuracy perspective)."

He recommended demagnetization the core of any remnant flux from previous usage; its easy to do according to Dr Google. Also check the surface faces for micro burrs that maybe shorting the laminations.

Mike
 
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