FIELD: insulation and/or cooling of electromagnetic devices including power transformers. SUBSTANCE: proposed alternative colloid liquids include carrier liquid in the form of oil and dispersed phase of nonmetal particles that function as magnetic particles; saturation magnetization is 1 to 20 Hs. EFFECT: augmented liquid circulation about entire transformer being cooled. 24 cl, 1 dwg, 3 tbl, 3 ex
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