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Air-gap iron core current transformer measurement structure

A technology of current transformers and iron cores with air gaps, which is applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as difficulty in built-in, large volume of short-circuit current, etc., and achieve good linearity, small cross-sectional area of ​​the iron core, The effect of the protection circuit

Active Publication Date: 2016-11-09
李蕊名
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to measure the short-circuit current in the circuit, it is difficult to build it into a smaller-sized current protection device.

Method used

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  • Air-gap iron core current transformer measurement structure
  • Air-gap iron core current transformer measurement structure
  • Air-gap iron core current transformer measurement structure

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Experimental program
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Effect test

Embodiment Construction

[0025] As shown in the figure, the present invention includes an electromagnetic coil and an iron core. The iron core is composed of two half-frame iron cores fastened together; one end of the two half-frame iron core fastening ends is placed inside the electromagnetic coil, and the other end is covered with a sheath; A conductive row of the tested circuit is bypassed at the end of the sheath of the inner ring of the iron core, and the inner side is connected with the sheath; an insulating air gap pad is set between the fastening ends of the two half-frame iron cores placed inside the electromagnetic coil.

[0026] The output end of the electromagnetic coil is connected to the input end of the current signal setting unit, the output end of the current signal setting unit is connected to the signal input end of the microprocessor unit, and the control signal output port of the microprocessor unit is connected to the control signal input port of the current protection device The ...

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Abstract

The invention belongs to the technical field of current transformer measurement, and particularly relates to an air-gap iron core current transformer measurement structure. The air-gap iron core current transformer measurement structure provided by the invention is small in size and wide in measurement range. The air-gap iron core current transformer measurement structure comprises an electromagnetic coil and an iron core, wherein the iron core is formed by buckling two half-frame iron cores. One of the buckling ends of the two half-frame iron cores is placed at the inner side of the electromagnetic core, and the other end is sleeved by a sheath. A conducting bar of a measured circuit steers by the inner ring sheath end of the iron core, and the inner side of the conducting bar is connected with the sheath. Key points of the structure are that an insulating air gap pad is arranged between the buckling ends of the two half-frame iron cores arranged at the inner side of the electromagnetic coil; an output end of the electromagnetic coil is connected with an input end of a current signal setting unit, an output end of the current signal setting unit is connected with a signal input end of a microprocessor unit, and a control signal output port of the microprocessor unit is connected with a control signal input port of a current protection device of the measured circuit.

Description

technical field [0001] The invention belongs to the technical field of current transformer measurement, and in particular relates to a measurement structure of an iron core current transformer with an air gap. Background technique [0002] The existing current transformer iron core generally does not have an air gap, and the measurement range is narrow and generally only used to measure the rated current in the circuit. If it is necessary to measure the short-circuit current in the circuit with a large volume, it is difficult to build it into a small-volume current protection device. As a result, a transformer with a small size and a small measurement range is used for measuring the rated current, and a current transformer with a large volume for protection is used for short-circuit current protection, and the two cannot be combined. Therefore, it is necessary to increase the measurement range of the current transformer, reduce the size of the current transformer, improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 张洪松陈阅文乔军
Owner 李蕊名
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