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A High Accuracy Electronically Compensated Current Transformer

A current transformer, high-accuracy technology, applied in the direction of voltage/current isolation, etc., can solve the problems of limited magnification and high error of feedback circuit

Inactive Publication Date: 2017-06-16
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its essence is a zero-flux self-balancing current transformer. Due to the limitation of system stability, the amplification factor of the feedback circuit is limited, so its error is still relatively high.

Method used

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  • A High Accuracy Electronically Compensated Current Transformer
  • A High Accuracy Electronically Compensated Current Transformer
  • A High Accuracy Electronically Compensated Current Transformer

Examples

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Embodiment Construction

[0016] Glossary Explanation: High-precision electronically compensated current transformer, referred to as ECCT in this article.

[0017] Marks in the drawings: 1—detection core, 2—detection winding, 3—inner compensation winding, 4—shielding iron core, 5—outer compensation winding, 6—secondary winding, 7—primary winding, 8—auxiliary circuit .

[0018] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] as attached figure 1 and 2 As shown, the ECCT of the present invention includes a detection core 1, a detection winding 2, an inner compensation winding 3, a shielding iron core 4, an outer compensation winding 5, a secondary winding 6, a primary winding 7 and an auxiliary circuit 8, wherein the primary winding 7 can not. A detection winding 2 and an inner compensation winding 3 are sequentially wound on the detection core 1 . The shielding iron core 4 completely encloses the detection iron core 1 , th...

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Abstract

The invention relates to a high-accuracy electronic compensation type current transformer, which belongs to the field of current measurement. The invention consists of iron core, winding and auxiliary circuit for compensating excitation current. The iron core consists of a detection iron core and a shielding iron core to form a nested structure. The detection iron core detects the zero flux state of the iron core through the winding on the upper side, and then controls the auxiliary circuit to provide the excitation current necessary for the current transformer, which eliminates the error source of the current transformer and greatly improves the accuracy of the current transformer . By applying the invention, a 0.001-level high-accuracy current transformer that is insensitive to secondary loads and an open-type current transformer with an accuracy better than 0.01-level can be developed.

Description

technical field [0001] The invention relates to a high-accuracy electronic compensation type current transformer, which belongs to the field of current measurement. Background technique [0002] The development of traditional electromagnetic current transformers is very mature. Through some compensation measures, the accuracy can reach 0.01 level. The accuracy of the double-stage current transformer used as a current standard in the laboratory can reach 0.001 level, but its load capacity is poor, and it is generally only used as a standard. The current comparator with higher accuracy does not belong to the type of current transformer, and generally can only be used for laboratory calibration and verification. [0003] In recent years, people pay more and more attention to the online measurement of current, phase and power. To achieve this purpose, it is often necessary to disconnect the primary circuit to access a high-accuracy current transformer. This work is time-consu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18
Inventor 李鹤雷民章述汉李前熊前柱胡浩亮李登云杨春燕
Owner STATE GRID CORP OF CHINA
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