Broadband current transformer

A current transformer and broadband technology, applied in the field of transformers, can solve problems such as the inability to meet the accurate measurement requirements of harmonic current, and achieve the effect of improving the accuracy of high-frequency current measurement, eliminating the main error source, and improving the accuracy of current measurement.

Active Publication Date: 2016-05-11
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, traditional current transformers cannot meet the accurate measurement requirements of harmonic currents

Method used

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Embodiment Construction

[0024] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0025] as attached figure 1 And attached figure 2 As shown, the broadband current transformer provided by the present invention includes detection core 1, detection winding 2, detection winding copper shield 3, inner magnetic shield 4, inner compensation winding 5, outer magnetic shield 6, outer compensation winding 7, outer compensation winding copper Shield 8, secondary winding 9, secondary winding copper shield 10, primary winding 11, auxiliary circuit 12, external compensation winding compensation capacitor 13, and secondary winding compensation capacitor 14.

[0026] Such as figure 1 As shown: the detection winding 2 is wound on the detection core 1, and the copper shield 3 of the detection winding is wrapped. The inner magnetic shield 4 completely encloses the detection core 1 , ...

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Abstract

The invention provides a broadband current transformer. The broadband current transformer comprises a detection iron core (1), wherein a detection winding (2), a detection winding copper screen (3), an inner magnetic screen (4), an inner compensation winding (5), an outer magnetic screen (6), an outer compensation winding (7), an outer compensation winding copper screen (8), a secondary winding (9), a secondary winding copper screen (10) and a primary winding (11) are arranged outside the detection iron core (1) from an inner layer to an outer layer in sequence; compensation capacitors (13) are connected at two ends of the outer compensation winding (7) in parallel, and compensation capacitors (14) are connected at two ends of the secondary winding (9) in parallel; and the number of windings of the inner compensation winding (5) is equal to that of the outer compensation winding (7). According to the broadband current transformer, main error sources of the current transformer are eliminated, the capacitive error of the broadband current transformer is reduced, and the measurement accuracy of high-frequency current is improved.

Description

technical field [0001] The invention relates to a transformer, in particular to a high-precision broadband current transformer. Background technique [0002] The current transformer with proportional conversion of current has the function of converting large current into standard small current (5A or 1A, both refer to rated value) in proportion to realize the standardization and miniaturization of measuring instruments, protection equipment and automatic control equipment. [0003] When the traditional current transformer is used to measure the broadband current (500Hz~3000Hz), the current proportional error begins to increase. The reason for the error is: as the current frequency increases, the distributed capacitance between the layers and turns of the proportional winding makes the proportional winding generate Larger and larger capacitive leakage currents, resulting in capacitive errors of the current transformer. Therefore, traditional current transformers cannot meet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/30H01F27/28H01F27/36H01F27/40H01F38/32G01R15/18
Inventor 李鹤雷民章述汉胡浩亮熊前柱李登云杨春燕
Owner STATE GRID CORP OF CHINA
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