A.C. cable with two concentric conductor configurations of stranded single conductors

An alternating current cable, comprising:

• at least one cable core including inner and outer concentric conductor arrangements of stranded individual conductors,
• wherein the inner concentric conductor arrangement is a forward conductor and the outer concentric conductor arrangement is a return conductor,
• wherein at least one of the inner and outer conductor arrangements includes a plurality of conductor layers of the individual conductors arranged in a helix-like manner with predetermined stranding angles around a carrier body,
• wherein the predetermined stranding angles are selected so that the following relationships are satisfied for the inner concentric conductor arrangement:
• ##EQU7## with ##EQU8## and wherein the predetermined stranding angles are selected so that the following relationships are satisfied for the outer concentric conductor arrangement:
• ##EQU9## with ##EQU10## wherein l.sub.ji and l.sub.ja are lengths of a pitch of the individual conductors in a jth conductor layer of the inner conductor arrangement and the outer conductor arrangement, respectively;
• .alpha..sub.ji and .alpha..sub.ja are the predetermined stranding angles of the individual conductors in the jth conductor layer of the inner conductor arrangement and the outer conductor arrangement, respectively;
• N.sub.i and N.sub.a are the numbers of conductor layers of the inner conductor arrangement and the outer conductor arrangement, respectively;
• H.sub.zi and H.sub.za are axial fields induced in an interior of the cable core by the inner conductor arrangement and the outer conductor arrangement, respectively;
• J is the specific current density in each conductor layer;
• R.sub.i and R.sub.a are the mean radii of a combination of all conductor layers of the inner conductor arrangement and the outer conductor arrangement, respectively;
• and
• .DELTA.R.sub.i and .DELTA.R.sub.a are differences between the mean radii of adjacent conductor layers of the inner conductor arrangement and the outer conductor arrangement, respectively.