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Error compensating method for transformer

An error compensation and transformer technology, applied in the direction of inductors, transformers/inductor cores, transformer/inductor components, etc., can solve problems such as error increase, and achieve reduced error, high accuracy, and reduced size Effect

Inactive Publication Date: 2008-04-30
ハンコックアイイーディー +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] In the above two methods, when the current contains a DC component, the error increases due to the difference in hysteresis characteristics
In addition, errors also increase when harmonic components appear in the current so that the current increases and decreases repeatedly

Method used

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  • Error compensating method for transformer
  • Error compensating method for transformer
  • Error compensating method for transformer

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Embodiment Construction

[0051] Hereinafter, an error compensation method for a transformer according to the present invention will be described in detail with reference to the accompanying drawings. In this case, an iron core current transformer will be used as an example.

[0052] FIG. 5 is a view showing an equivalent circuit of a current transformer in which hysteresis characteristics of an iron core are considered. Here, R c and L m Represent iron loss impedance and magnetizing inductance, both of which have nonlinear characteristics. In addition, i 0 i c and i m Denote the excitation current, iron loss current and excitation current respectively, where, establish i 0 = i c + i m Relationship.

[0053] The hysteresis characteristic of the iron core is shown by showing the relationship between the magnetic flux and the excitation current (λ-i 0 ) to represent the curve. FIG. 6 shows a hysteresis curve selected from the plurality of hysteresis curves of FIG. 4 (refer to the outer curve o...

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Abstract

Provided an error compensating method for an instrument transformer, in which an error of an instrument transformer is compensated by reflecting hysteresis characteristics of iron core. When such error compensation is performed, a hysteresis loop indicating the relationship between magnetic flux and excitation current is not used as it is, but core-loss resistances and magnetic flux-excitation current curves are used, thereby achieving more precise compensation. According to the present invention, an error of an instrument transformer can be significantly reduced. Therefore, it is possible to manufacture an instrument transformer with high accuracy and to significantly reduce the size of the instrument transformer. Further, a material with high permeability does not need to be used in order to increase the accuracy.

Description

technical field [0001] The invention relates to an error compensation method for a transformer. In this error compensation method, the error of the transformer is compensated by reflecting the hysteresis characteristics of the iron core. When performing this error compensation, instead of using a hysteresis loop representing the relationship between flux and excitation current, core-loss resistance and flux-excitation current curves are used, resulting in more accurate compensate. Background technique [0002] Transformers are used to measure the current and voltage flowing in a variety of electrical equipment such as generators, transmission lines and transformers. As for the transformers, there are provided voltage transformers for measuring voltage and current transformers for measuring current. According to the application, the transformer is divided into a protective transformer and a measuring transformer. [0003] As for the current transformer, there are provided...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/24
CPCH01F27/422G01R35/02H01F27/427H01F27/24H01F38/28G01R15/18
Inventor 金容均姜龙澈张成一
Owner ハンコックアイイーディー