Digital processing and calculating AC electric energy metering system Patent #: 4077061
ApplicationNo. 05/923620 filed on 07/11/1978
US Classes:324/127, Transformer (e.g., split core admits conductor carrying unknown current)323/357, For current transformer324/126With coupling means (e.g., attenuator, shunt)
ExaminersPrimary: Rolinec, Rudolph V.
Assistant: Karlsen, Ernest F.
Attorney, Agent or Firm
International ClassG01R 15/14 (20060101)
AbstractA current sensing transducer includes a conductive current divider including a branch path for conducting a fractional current proportional to a current to be sensed and being applied through the divider. A compensated transformer includes a primary circuit responsive to the fractional current and two secondary windings. An amplifier circuit controls the current input to one secondary winding in response to the output of the other secondary winding so that the flux of the primary circuit is virtually compensated in the core and the secondary winding current is a measure of the current to be sensed.