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Zero-flux current transformer

A current transformer, zero magnetic flux technology, applied in the field of transformers, can solve the problems of high process requirements, high cost, complex circuits, etc., and achieve the effects of high detection accuracy, simple manufacturing process, and simple detection circuit

Active Publication Date: 2022-02-25
江苏科兴电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the traditional zero-flux current transformer circuit complexity, high process requirements, high cost and other problems, the purpose of the present invention is to provide a zero-flux current transformer

Method used

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Embodiment Construction

[0020] The specific embodiment of the present invention is described in further detail below in conjunction with accompanying drawing:

[0021] Such as figure 1 As shown, the present invention proposes a zero-flux DC current transformer, which consists of two independent secondary windings 3, an iron core 1 for generating magnetic flux in the secondary winding 3, and a detection circuit connected to the two secondary windings 3 4. It consists of a demagnetization device 5 installed on the detection circuit 4, an anti-interference device 6 installed on the detection circuit, and a current compensation system 7 installed on the detection circuit.

[0022] The iron core 1 is made of Permalloy, which has a magnetization curve close to the ideal state. The grade is 1J79 or 1J85, and the specifications and dimensions of the two iron cores 1 are the same.

[0023] The detection circuit 4 is used to integrate the notched direct current output by the two secondary windings into a non-...

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Abstract

The invention relates to the field of transformers, and provides a zero-flux current transformer. The zero-flux current transformerincludes two independent secondary windings, iron cores which are arranged in the secondary windings and are used for generating magnetic flux, and a detection circuit which is connected with the two secondary windings. The rectifier diode D1 and the rectifier diode D2 are connected in series between two corresponding terminals of the two secondary windings in the same direction, the rectifier diode D3 and the rectifier diode D4 are connected in series between the other two corresponding terminals of the two secondary windings in the same direction, and the sampling resistor Rf is connected in parallel with the rectifier diode D3 and the rectifier diode D4; the two ends of the alternating current excitation power source e are connected with the contact of the rectifier diode D1 and the rectifier diode D2 and the contact of the rectifier diode D3 and the diode D4 respectively. The detection circuit is connected with a demagnetizing device, an anti-interference device and a current compensation system. The zero-flux current transformer is high in primary current measurement precision, simple in structure, stable in performance, low in manufacturing process requirement and low in price.

Description

technical field [0001] The invention relates to the field of transformers, in particular to zero-flux current transformers. Background technique [0002] Traditional high-voltage zero-flux current transformers have complex principles, difficult manufacturing processes, and large volumes. All zero-flux current transformers used in domestic DC projects are monopolized by foreign imported products. In recent years, domestic zero-flux transformers have made breakthroughs in principle, but limited by the manufacturing process, there is still a certain gap between product accuracy and stability compared with imported products. Imported zero-flux current transformers are expensive, up to 900,000 each, and after-sales maintenance is difficult. Contents of the invention [0003] In order to solve the problems of traditional zero-flux current transformers such as complex circuits, high process requirements, and high cost, the purpose of the present invention is to provide a zero-fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 吴春风姚海明杨峰蔡强姜凌云徐一峰朱冬明王琪吴健
Owner 江苏科兴电器有限公司