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Air core coil current sensor with magnetic core

A technology of current sensor and air-core coil, applied in the direction of inductor, measuring current/voltage, instrument, etc., can solve the problems of long-distance transmission of weak voltage signal, large induction signal of air-core coil, impossible mutual inductance, etc. The effect of light weight and strong anti-interference ability

Inactive Publication Date: 2006-10-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This device belongs to the traditional air-core coil current transformer. It does not have the problems of ferromagnetic saturation and residual magnetism. It has a wide measurement frequency range and is light in weight. It may be very large, the signal-to-noise ratio is not high, and it is impossible to transmit weak voltage signals over long distances. It often requires an active integrator to connect nearby to amplify the signal integration. It is an active sensor and is subject to many restrictions in use.

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  • Air core coil current sensor with magnetic core
  • Air core coil current sensor with magnetic core
  • Air core coil current sensor with magnetic core

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Embodiment Construction

[0015] The present invention is further described now in conjunction with accompanying drawing.

[0016] Such as figure 1 As shown, the sensor head of the present invention has an annular shape, and its cross section is as follows figure 2 Shown: Toroidal core C 1 It is the magnetic particles, such as Fe, CO, Ni, FeCo, NiFe, Fe 3 o 4 , Fe 2 o 3 etc., put it into liquid curable insulating material such as resin or modified resin, add a certain amount of additives, such as amine curing agent, ethylenediamine, dibutyl fat, etc., stir well and pour it into the ring mold, and solidify the formed magnetic core. In the ring core C 1 In addition, the first detection coil W is wound in parallel with two wires 21 and the second detection coil W 22 , Set the copper shielding layer E outside the detection coil.

[0017] For example, select Fe powder with a weight percentage of 0.1%, put it into a modified resin, add an amine curing agent, stir evenly, pour it into a ring mold, ...

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Abstract

The air core coil current sensor with magnetic core is one current detecting device for transducing AC current and transient current accurately in the measurement of AC current and transient current. The air core coil current sensor has one sensor head including one annular magnetic core, two detection windings of duplex wound two wires structure and the same parameters on the magnetic core, and one copper or aluminum shielding layer outside the detection windings; and one RC integrating circuit, connected together. The present invention is one passive sensor with no waveform deformation, wide measurement bandwidth and high reliability and may be used widely in electric power system and electrotechnology.

Description

technical field [0001] The invention belongs to current measuring equipment in the electrotechnical technology, which is used for measuring alternating current and transient current. Background technique [0002] Patent application number 200410038299.6 for the invention patent application "on-line demagnetization method for electromagnetic current transformer core", is to connect the demagnetization device to the secondary side of the electromagnetic current transformer and connect it in series with the load. The demagnetization device is a power electronic switch Device bidirectional thyristor and its control circuit and current sensor, timing (such as once a year) or operating personnel operate according to the current situation of the circuit; but the secondary side of the electromagnetic current transformer is connected in series or parallel active power electronic switching device or Passive devices, once the device fails or is damaged, especially in the series demagne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/00G01R19/00H01F38/32
Inventor 任士焱
Owner HUAZHONG UNIV OF SCI & TECH