Patent
Current measuring and magnetic core compensating apparatus and method
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TLDR
In this article, the magnetic bias is compensated by responding to the integral of the secondary current, which is a measure of the magnetic core flux variations, and the durations of the positive and negative flux variations are compared.Abstract:
DC magnetic flux bias imposed on a magnetic core of a current transformer is compensated in response to an indication of the amplitude and duration of opposite polarity secondary winding current components. In a second embodiment, the magnetic bias is compensated by responding to the integral of the secondary current. The integral of the secondary current is a measure of the magnetic core flux variations. The durations of the positive and negative flux variations are compared.read more
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References
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Patent
Current sensing transducer for power line current measurements
Joachim E. Wolf,Philip F. Locke +1 more
TL;DR: In this article, a 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.
Patent
Zero crossing detection and electronic compensation of D. C. saturation magnetization in current transformers used in watthour meter installations
Abstract: A watt hour meter installation is described which is of the type including an input transformer having an input winding for connection to an alternating current power supply line, an output winding for connection to a watt hour meter for measuring alternating current power being consumed and a bore on which the input and output windings are wound. The core is of the type which is susceptible to DC magnetization by a DC component superimposed on the alternating current being measured. In order to overcome the effect of the DC component on the magnetization characteristics of the input transformer, automatic compensation circuitry is provided which includes a sensor coupled to sense the current flowing through the input winding and for deriving a sensed output signal proportional to the sensed current and which includes both AC and DC components of the input current. A sensed signal processing circuit is provided in the form of positive and negative peak voltage detecting and holding circuit together with a summation circuit and voltage to current converter for deriving from the sensed signal a feedback signal which is proportional only to the DC component of the current flowing in the input winding. This feedback signal is supplied through a compensating winding wound on the input transformer core in a direction to automatically cancel out the effects of the superimposed DC component on the saturation characteristics of the input transformer.
Patent
Current transformer for measuring instruments
TL;DR: The current transformer for instruments for measuring electric currents includes a magnetic core that has two cores and an inductive current divider with three parallel current paths as mentioned in this paper, where magnetic fluxes mutually cancel one another.
Patent
Means for automatically compensating DC magnetization in a transformer
TL;DR: In this article, an automatic compensation of direct current magnetization of a current transformer in an alternating current watthour meter utilizing a magnetic field sensor and electronic circuitry to keep the transformer operating in its linear region when a DC component is superimposed on an AC current being provided to the transformer.
Patent
D.c. compensation circuit for miniature transformers
TL;DR: A d.c. compensation circuit for insertion in a miniature transformer to substantially compensate any d. c. magnetization and permit elimination of the requirement for an air gap is described in this article.