Current ratio device and toroidal core assembly therefor

Details Current ratio device and toroidal core assembly therefor Current ratio device and toroidal core assembly therefor

H - Electricity

01

F

H01F 3/00 (2006.01) G01R 15/18 (2006.01) H01F 38/30 (2006.01) H01F 38/32 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2082112

A current ratio device is used for forming a current transformer that can accurately scale down high currents to usable metering levels. The transformer has associated circuitry that renders it capable of functioning not only with ac and a mixture of ac and dc, but also when dc alone is present in the primary winding. The device employs a toroidal core and winding assembly that is cut along a plane containing the toroidal axis through a pair of diametrically opposite sections of the assembly that contain no windings, in order to separate the device into a pair of sub-assemblies that can be readily placed over a single turn primary, e.g. a busbar, without dismantling the same. Once so placed, the sub- assemblies can then be clamped together again to reform the device and the winding portions externally connected to the circuitry, the latter being such as to avoid the accuracy of measurement being significantly effected by the unavoidable increase in core reluctance that will have resulted from the separation of the core assembly into two sub-assemblies.

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