Impact of Copper Thickness, Conductor Width, and Number of Striations on Coupling Loss Characteristics of Copper-Plated Multifilament-Coated Conductors

Abstract

This article investigates the coupling loss characteristics of multifilament-coated conductors that have been plated with copper to connect electrically all the filaments to enhance their stability. Short pieces of copper-plated multifilament-coated conductors were prepared, each of which simulated a half-pitch of the conductor wound spirally on a round core with respect to the loop of the coupling current, and their magnetization losses were measured. The measured magnetization loss was separated into the hysteresis and coupling losses. This article focused on the latter one, which is peculiar to copper-plated multifilament-coated conductors, and the reduction of which is important for their applications. The coupling time constants as well as the geometry factors of the coupling losses and the magnitudes of coupling losses were studied using copper-plated multifilament-coated conductors with various copper thicknesses, numbers of striations, and conductor widths. Numerical electromagnetic field analyses were conducted, and the numerical and measured results were compared.