| 摘要 |
The invention relates to a current transformer for an alternating current which has direct current tolerances. The current transformer consists of at least one converter core with a primary winding and at least one secondary winding, a burden resistance being connected parallel thereto and closing the secondary circuit with a low resistance. A closed annular core without an air gap is used as the converter core, said annular core consisting of a strip which in turn consists of an amorphous, ferromagnetic alloy which is almost free of magnetorestrictions and which has a permeability mu < 1400. The following alloys have been shown to be particularly suitable for an annular strip core of this kind: cobalt-based alloys, essentially of the following formula: Coa(Fe1-xMnx)bNicXdSieBfCg wherein X is at least one of the elements V, Nb, Ta, Cr, Mo, W, Ge or P, a-f are given in atom %, and a, b, c, d, e, f, g and x satisfy the following conditions: 40 </= a </= 82; 2 </= b </= 10; 0 </= c </= 30; 0 </= d </= 5; 0 </= e </= 15; 7 </= f </= 26; 0 </= g </= 3; with 15 </= d + e + f + g </= 30 and 0 </= x < 1. |
