| 摘要 |
A current, power or frequency sensor for a cable having spaced conductors (22, 24) carrying equal and opposite currents includes a current transformer having a high permeability member (10) defining a pair of jaws (102, 104 Figure 5), the transformer having secondary windings (16, 18) connected to indicating means, such as a current meter (108 Figure 4 not shown). The cable is placed between the jaws in a relatively low permeability part of the flux path of the transformer and magnetic flux is able to flow between the spaced conductors (22, 24) of the cable as in Figure 1. Induced currents in the secondary windings (16, 18) are additively combined (20) and applied to the meter. <IMAGE> |
