Patent ID: 7242197
Filing Date: 2007-07-10
Classification: G01R

Abstract:
1. A current measuring apparatus for measuring current-under-measurement flowing between a first measuring terminal and a second measuring terminal, comprising: a primary coil whose one end is electrically connected with said first measuring terminal and another end thereof is electrically connected with said second measuring terminal; a secondary coil that generates voltage representing said current-under-measurement corresponding to said current-under-measurement flowing through said primary coil; and a coaxial cable having a signal line that electrically connects said one end of said primary coil with said first measuring terminal and a shield; wherein said coaxial cable has said signal line; an insulating layer for coating said signal line; first one of said shield having a tape-like conductor wound around said insulating layer; second one of said shield composed of a conductor provided around an outer periphery of said first shield; a plurality of said primary coils wherein, said secondary coil generates the voltage representing said current-under measurement corresponding to said current-under-measurement flowing through said plurality of primary coils; and a plurality of said coaxial cables, each corresponding to each one of said plurality of primary coils, having the signal line for electrically connecting said one end of said corresponding primary coil with said first measuring terminal and the shield.