Abstract
The manufacture of current transformers is associated with many design constraints, which include the restricted dimensions of its installation places, requirements for the accuracy class, as well as the limitation on the safety factor or the minimum factor of the accuracy limit factor. In a design sense of current transformers, these requirements are contradictory, which resulting in a flexible approach to the manufacture of current transformers. The use of combined magnetic cores can be referred to one of these areas, in other words magnetic cores consisting of materials with different magnetic properties, which allows to obtain unique magnetic properties that are inaccessible when using magnetic cores of the same type (material), thus providing a rational model of production. The article presents a feature of calculating of current transformer with combined magnetic cores.
Highlights
Current transformers became widely used for current measurement in high-voltage installations
The manufacture of current transformers is associated with many design constraints, which include the restricted dimensions of its installation places, requirements for the accuracy class, as well as the limitation on the safety factor or the minimum factor of the accuracy limit factor
Special attention is given to the approach to the calculating of the current and angular error, as well as the safety factor for the measuring windings in the case of the combined execution of the magnetic core on the current transformer
Summary
Current transformers became widely used for current measurement in high-voltage installations. Special attention is given to the approach to the calculating of the current and angular error, as well as the safety factor for the measuring windings in the case of the combined execution of the magnetic core on the current transformer. The appliance actuality of combined magnetic cores for current transformers consists in the possibility of obtaining measuring transformers with a high accuracy class at a minimum cost, mass and, dimension [6]. The latter requirement is often determinative due to the limited space for installing a set of current transformers at the outputs of breakers, supply transformers, and the like devices
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