Direct current resisting transformer based on composite magnetic core and manufacturing method thereof

Abstract

The invention discloses a direct current resisting transformer based on a composite magnetic core and a manufacturing method thereof. The manufacturing method is based on the error theory of the transformer and the characteristics that an iron-based amorphous material has the magnetic inductivity slighter inferior to that of an ultra-crystallite magnetic core but has a large saturated magnetic induction coefficient. When the detected current contains a direct current component, a saturated principle is not easily generated; the ultra-crystallite magnetic core (1) of a traditional current transformer is superposed with an iron-based amorphous magnetic core (2) according to the proportion, so that an electric energy in a semi-wave direct current load state can be accurately metered and the error rate is less than 1 percent; and meanwhile, technical requirements of related rules are met. The direct current resisting transformer disclosed by the invention has strong operability; and the ultra-crystallite magnetic core of the traditional current transformer is superposed with the iron-based amorphous magnetic core to form the composite magnetic core. The direct current resisting transformer has the advantages of no change of a winding technology, a pouring technology and a mounting mode of the traditional current transformer, convenience in replacement, and the like, and is suitable for designing and manufacturing the direct current resisting transformer.

Description

[0001] technical field [0002] The invention relates to an anti-DC low-voltage current transformer based on an iron-based amorphous / ultramicrocrystalline composite magnetic core and a manufacturing method thereof, belonging to the technical field of electric power metering current transformer manufacturing. Background technique [0003] The low-voltage current transformer is used for the current ratio conversion of the electric energy metering device of the low-voltage power user. It is composed of an iron core, a coil and an insulating material. It can only accurately measure the sine wave current of 50Hz and the degree of distortion <5%. The load nature of power users in today's society is developing toward diversification. Some of the user's loads contain a large amount of DC components or even half-wave DC loads. The current transformer is affected by the DC component of the half-wave current, and the iron core is close to the saturation area. The conductivity de...

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Problems solved by technology

[0004] The purpose of this invention is to solve the problem that the current transformer is affected by the DC component of the half-wave current, and the equivalent magnetic permeability of the iron core is close to the saturation area, which leads to inaccurate measurement Problem, the present invention provides a kind of anti-DC low-voltage current transformer manufacturing method based on iron-based amorphous / ultrafine crystal composite magnetic core

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