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Mutual inductor in current transformer

A technology of current transformers and mutual induction coils, which is applied in the direction of inductors, transformers/inductor coils/windings/connections, coil manufacturing, etc., can solve problems such as winding process difficulties, achieve winding uniformity, and reduce winding Difficulty, desensitization effect

Inactive Publication Date: 2011-04-06
SIEMENS AG
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the closed circular coil brings great difficulties to the winding process, especially when the volume of the current transformer is required to be small.

Method used

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  • Mutual inductor in current transformer
  • Mutual inductor in current transformer
  • Mutual inductor in current transformer

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Embodiment Construction

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The mutual induction coil in the current transformer provided by the present invention is a polygonal coil composed of at least three independent coils connected end to end; wherein, the two ends of adjacent two independent coils overlap each other, and each independent coil is connected to other independent coils. The winding density of the overlapping portion is smaller than that of the non-overlapping portion.

[0026] Due to the saturation characteristics of the iron core under high current conditions, the measurement range of the current transformer will be affected. In order to expand the measurement range of the current transformer, the bobbin can be made of insulating material, that is, each independent coil is made of Rokovsky Coil (Rogow...

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Abstract

The invention provides a mutual inductor in a current transformer, which is a polygon coil formed by end-to-end connection of at least three independent coils, wherein two ends of two adjacent independent coils are mutually overlapped, and the winding density of the overlapped part of each independent coil with other independent coils is less than that of the non-overlapped part. The invention can reduce the influence from external interference and the sensibility to the position of a measured conductor, improves the measurement precision of the current transformer, lowers the winding difficulty, and has more remarkable advantages especially when the volume of the current transformer is smaller.

Description

technical field [0001] The invention relates to the technical field of current measurement, in particular to a mutual induction coil in a current transformer. Background technique [0002] At present, the requirements for molded case circuit breakers (MCCB, Molded Case Circuit Breaker) are gradually developing in the direction of power saving and high precision. The MCCB with a single protection function can no longer meet the rapidly developing market demand. The new MCCB at the same time MCCB with protection function and current quality analysis has stronger competitiveness. [0003] For the current quality analysis function, high-precision current measurement is necessary for MCCB. In the existing MCCB products, iron core current transformer is the mainstream of current measurement, which has the advantages of simple structure and low cost, such as figure 1 As shown, the core current transformer is composed of a square coil surrounded by four independent coils. These coi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/28H01F27/28H01F41/06
Inventor 杜峰张先刚卓越
Owner SIEMENS AG
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