go to the Power transformers product page Anonymous asked on Sep 15th, 2017 in Power transformers

Magnetic flux level from power transformer

Do ABB have any, very approx. idea of level of magnetic field/flux just above a power transformer cover and around the transformer? Range 40-150 MVA, 70-145 kV

Abhishek Rai, Marketing and Sales Manager

ABB's answer

To provide you with an accurate answer, we have approached the International Electrotechnical Commission (IEC).
The IEC conclusion is that the only leakage flux outside a power transformer equipped with a magnetic steel tank is coming from the bushing leads on the outside of the cover (or tank).
The general attitude within IEC, is that this is not an issue for transformer people – it is an issue for people dealing with the equipment outside a transformer. We can well understand this attitude, because of the penetration depth at 50 Hz is 1-2 mm and the thickness of a steel tank is 8-10 mm.
This is slightly different for the large generator step-up units with non-magnetic inserts, particularly in the cover. For non-magnetic steel, the penetration depth at 50 Hz is about 50 mm and through these parts a lot of flux from the LV-leads will come to the outside.


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  • Abhishek Rai

    Abhishek Rai

    Marketing and Sales Manager

    Large and medium power transformers

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