Unlock instant, AI-driven research and patent intelligence for your innovation.

High-frequency current sensor based on frequency-varying integral resistor

A technology of integrating resistance and high-frequency current, applied in the direction of voltage/current isolation, only measuring current, measuring current/voltage, etc., can solve the problems of loss of measurement i, high magnetic field strength of magnetic core, deep saturation of magnetic core, etc.

Active Publication Date: 2020-12-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, for a 50Hz current i r , L's inductive reactance ωL=314L, much smaller than R, then i 2r The magnetic potential in the core is much smaller than i r In the magnetic potential in the magnetic core, the two cannot completely cancel each other, resulting in a large magnetic field strength in the magnetic core, deep saturation of the magnetic core, and then completely losing the measurement i in the saturation region 1 Ability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-frequency current sensor based on frequency-varying integral resistor
  • High-frequency current sensor based on frequency-varying integral resistor
  • High-frequency current sensor based on frequency-varying integral resistor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Such as image 3 , a high-frequency current sensor based on a frequency-variable integrating resistor, which consists of a coil [1], a resistor [2] and a frequency-variable resistor [3]; the resistor [2] is connected in parallel with the frequency-variable resistor [3].

[0028] The magnetic core of the coil [1] is ring-shaped as a whole, the cross section is square, and the material is iron-based amorphous with good magnetic permeability. The inner diameter is 400mm, the outer diameter is 440mm, the height is 25mm, and the relative magnetic permeability is 2000; the coil [1] Wound from copper enameled wire. The diameter of the copper enameled wire is 0.5mm, which is evenly wound on the magnetic core, and 150 turns are wound to form a coil [1]. Then, the inductance L of this coil is equal to 0.021H. For the existing coil-type current sensor,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a high-frequency current sensor based on a frequency-varying integral resistor. The sensor is composed of a coil, an integrating resistor and a frequency-varying integrating resistor. The frequency-varying integrating resistor is connected to two ends of the coil. Nonlinear change of the frequency-varying integral resistor along with the frequency causes remarkable nonlinearity along with the frequency to the sensor, so that the sensor has high anti-interference capability, and particularly can resist magnetic saturation caused by power frequency current.

Description

technical field [0001] The invention belongs to the field of current signal measurement, and specifically refers to a coil-type high-frequency current sensor with obvious nonlinear characteristics with frequency and strong anti-interference ability. Background technique [0002] In some application scenarios, the coil-type current sensor is used to detect the current signal on the conductor, and there is a very strong interference current on the conductor. For example, when using the frequency response method to detect the deformation of a large-scale power transformer winding that is running live, it is necessary to use a coil-type current sensor to detect a weak frequency-sweeping current signal of 1 kHz to 10 MHz on the high-voltage lead-out line of the power transformer. Hundreds or even thousands of amperes of power frequency current. This power frequency current will not only submerge the useful signal in the output signal of the current sensor in the huge amplitude p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/0092G01R15/183
Inventor 程养春常文治毕建刚沙雨飞丁国成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)