High magnetic conductivity Rogowski coil with air-gap iron core

A technology with high magnetic permeability and iron core, which is applied in the direction of coils, coil manufacturing, electrical components, etc., can solve the problems of insufficient driving capacity and too small output signal, and achieve consumption saving, increased output signal, and easy signal processing Effect

Inactive Publication Date: 2007-02-14
武汉格蓝若光电互感器有限公司
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the general air-core coil output signal is too

Method used

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  • High magnetic conductivity Rogowski coil with air-gap iron core
  • High magnetic conductivity Rogowski coil with air-gap iron core
  • High magnetic conductivity Rogowski coil with air-gap iron core

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[0022] The high permeability Rogowski coil of the present invention uses an air-gap iron core as a skeleton, and its purpose is to increase its mutual inductance and increase the induced potential, so as to facilitate circuit processing and direct use with secondary meters. The implementation is:

[0023] 1. The design of the air gap core. First, determine the shape and basic dimensions of the Rogowski coil bobbin according to the specific application environment, mainly the shape and physical dimensions of the primary current-carrying wire, including outer diameter, inner diameter and height; then, determine the core material according to the frequency range of the measured current , Medium and low frequencies generally use silicon steel sheets, and for ultra-high frequency applications, materials with good frequency performance are generally used, such as nanocrystalline or amorphous. Finally, the number of air gaps should be selected according to the size of the primary current...

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Abstract

This invention relates to a high permeability Rogowski coil with air gap iron core including a framework and a secondary winding, in which, the framework is composed of the iron core with air gap opened with at least one gap, the secondary winding is distributed on the framework uniformly and leads out two inductive potential terminals, the coil takes the air gap core as the framework to increase relative magnetic permeability, the uniform distribution of air gaps reduces leakage greatly and secures the constancy of relative magnetic permeability, since the magnet inductive strength of the core is uniform and the ability of anti-interference to outside magnetic fields is strong, the distribution of the windings of the secondary winding needs approximately uniform only so to simplify the production of secondary windings.

Description

technical field [0001] The invention relates to a sensor for measuring magnetic field or current, in particular to a novel Rogowski coil. Background technique [0002] Now, people tend to limit Rogowski coils to air-core coils, and the skeleton of the coil is naturally defined as a non-magnetic material. There is no doubt that the air-core coil has a huge dynamic range, and it can even be considered theoretically that it will never be saturated. However, the air-core coil also has a huge disadvantage. The measured rated current is hundreds of amperes , the output voltage of the air-core coil is generally about tens of millivolts. Therefore, when the air-core coil is used as a current measuring device connected to secondary instruments such as metering and display, the induced potential signal must be amplified and processed by the corresponding circuit. To increase the service life of the instrument, passive pointer secondary instruments are often used....

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Application Information

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IPC IPC(8): H01F5/02H01F41/04
Inventor 李红斌
Owner 武汉格蓝若光电互感器有限公司
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