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Current sensor adopting differential coil structure

A current sensor and current technology, applied in the direction of coils, measuring current/voltage, instruments, etc., can solve the problems of low stability of the secondary output signal and susceptibility to external magnetic field interference, etc.

Inactive Publication Date: 2011-05-11
GUANGDONG SIHUI INSTR TRANSFORMER WORKS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the low stability of the secondary output signal of the air-core coil and to be easily disturbed by the external magnetic field, and to provide a current sensor with a simple structure, convenient installation, and a precision of 0.2 using a differential coil structure

Method used

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  • Current sensor adopting differential coil structure

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Embodiment Construction

[0011] Such as figure 1 , figure 2 , image 3 and Figure 4 As shown, the present invention includes: a primary current carrier 1, a primary current sensing unit 2, a compensation winding 3, a double-shielded twisted pair 4, and an aviation plug with a metal shield to form a whole.

[0012] The primary current carrier 1 is a single-turn primary winding, which is welded by a copper bar 5 and a primary conductor 6. The size of the primary conductor 6 is determined by the rated primary current and the dynamic and thermal stability current value.

[0013] The primary current sensing unit 2 is assembled by an air-core coil 7 and a metal shielding shell, and the interior can be filled and fixed with epoxy resin. The number of turns of the air-core coil 7 and the size of the skeleton 9 are determined by the rated primary current of the product. The size of the value and the size of the secondary output signal are determined. The metal shielding shell is an annular metal shell wit...

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Abstract

The invention discloses a current sensor adopting a differential coil structure for eliminating external magnetic field interference. The current sensor comprises a primary current carrier, a primary current sensing unit, a compensating winding, a double-shielding twisted pair and an air plug. The primary current carrier passes through the center of the primary current sensing unit; and the metal shielding shell of the winding, the shielding layer of a signal transmission wire and the metal part of the air plug form a whole to improve the signal-to-noise ratio of secondary signals. The hollow coil has the key technology of improving the noise immunity of power frequency magnetic fields. By improving the internal structure of the coil, adding a loop wire in the coil, manufacturing two hollow coils with consistent structures and performance parameters and counteracting the external magnetic field interference through differential structures connected in series at the corresponding terminals, the secondary output precision of the current sensor meets the requirement of 0.2-level electrical energy metering.

Description

technical field [0001] The invention relates to an important component of an electronic current transformer used in the field of electric system current measurement and relay protection, that is, a current sensor using an air-core coil as a sensing unit. Background technique [0002] Since the advent of the transformer, the electromagnetic current transformer has been fully developed. However, with the continuous increase of the transmission capacity of the power system and the continuous improvement of the voltage level, the electromagnetic current transformer has exposed more and more inherent shortcomings. Meet the requirements of power system development. With the widespread application of relay protection and measurement systems based on microcomputer technology, the power requirements for input signals are greatly reduced. In this situation, it brings opportunities for the application of electronic current transformers in power systems. [0003] At present, most elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H01F5/02
Inventor 张树华梁永亮伍仕朋李基森陈玫
Owner GUANGDONG SIHUI INSTR TRANSFORMER WORKS
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