| 摘要 |
A magnetic core for a hybrid non-contact current meter having a magnetic core that is adapted for encircling a current carrying conductor wherein the magnetic core includes a first portion having a first integral toroidal section and a first pair of opposing side walls extending therefrom, a second portion having a second integral toroidal section and a second pair of opposing side walls extending therefrom such that the first portion and second portion are coupled together so to define an aperture between the first and second pairs of opposing side walls. The first and second integral toroidal sections are designed so to be void of any discontinuities within the flow path of the magnetic flux and to have a circular shape so to promote a more thorough flux saturation whereby a reduction of zero errors results and more accurate current measurement are obtained. The hybrid non-contact current meter further includes a drive circuit for saturating the magnetic core and a switch control circuit which activates first and second switches so to automatically change the mode of operation from a low frequency mode employing a saturation technique to a high frequency mode employing a current transformer technique.
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