Patent ID: 6563411
Filing Date: 2003-05-13
Classification: H01F,Y10T

Abstract:
Current transformer for alternating current with direct current components consisting of at least one transformer core with a primary winding and at least one secondary winding to which a burden resistor is connected in parallel and terminates a secondary circuit with low resistance, specially characterized in thatthe transformer core comprises a closed ring core with no air gap produced from a strip made of an amorphous ferromagnetic alloy; the amorphous ferromagnetic alloy has a magnetostriction value |&lgr;S|<0.5 ppm and permeability &mgr;<1400; and the alloy has a composition consisting essentially of the formula Coa(Fe1-xMnx)bNicXdSieBfCg. â€ƒwhere X is at least one of the elements V, Nb, Ta, Cr, Mo, W, Ge and P, a-g are given in atomic % and whereby a, b, c, d, e, f, g and x satisfy the following conditions: 40&lE;a&lE;82; 2&lE;b&lE;10; 0&lE;c&lE;30; 0&lE;d&lE;5; 0&lE;e&lE;15; 7&lE;f&lE;26; 0&lE;g&lE;3; with 15&lE;d+e+f+g&lE;30 and 0&lE;x<1.