Current measurement and protective sensor for high-voltage alternating current

A current measurement and sensor technology, applied in the direction of AC/pulse peak measurement, etc., can solve problems such as difficult integration

Active Publication Date: 2011-11-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to integrate the two functions of general current high-precision measurement and high-current protection

Method used

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  • Current measurement and protective sensor for high-voltage alternating current
  • Current measurement and protective sensor for high-voltage alternating current
  • Current measurement and protective sensor for high-voltage alternating current

Examples

Experimental program
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Embodiment 1

[0045] A kind of high-voltage AC current measurement and protection sensor device used in the present invention such as figure 1 and figure 2 shown. figure 1 The light emitted by the middle laser 1 is coupled into the first transmission fiber 3 through the convex lens 2 and then output from the first self-focusing lens 4 , and is vertically incident on the first polarizer 5 and enters the current sensor head 6 as linearly polarized light. In the sensing head, under the modulation of alternating current, the modulation angle information is carried out from the output end, after passing through the second polarizer 7, it is coupled into the second optical fiber 9 by the second self-focusing lens 8, and finally the light intensity is detected by the photodetector 10 The signal is output to the signal processing unit 11. Signal processing unit 11 such as figure 2 As shown, the electrical signal output by the photodetector 10 passes through the filter 11.1, and the 2-fold freq...

Embodiment 2

[0048] A kind of high-voltage AC current measurement and protection sensor device used in the present invention such as figure 1 and figure 2 shown. figure 1 The light emitted by the middle laser 1 is coupled into the transmission fiber 3 through the convex lens 2, and then output from the self-focusing lens 4, and is vertically incident on the polarizer 5, and enters the current sensor head 6 as linearly polarized light. In the sensing head, under the modulation of alternating current, the modulation angle information is carried out from the output port, after passing through the polarizer 7, it is coupled into the optical fiber 9 by the self-focusing lens 8, and finally the light intensity signal is detected by the photodetector 10 and output to the signal processing Unit 11. Signal processing unit 11 such as figure 2 As shown, the electrical signal output by the photodetector 10 passes through the filter 11.1, and the 2-fold frequency component (2ω), the 4-fold frequen...

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Abstract

The invention provides a high-voltage alternating current sensor which integrates functions of measurement and protection by using the frequency spectrum technology based on the alternating-current magneto-optic modulation theory and the Ampere circuital theorem. By the high-voltage alternating current sensor, the high-accuracy measurement requirement of common current and the high-accuracy measurement and protection requirement of heavy current also can both be met. A 2-times frequency component (2 omega), 4-times frequency component (4 omega), 8-times frequency component (8 omega) and 10-times frequency component (10 omega) are selected respectively by a filter; the amplitude of the 4-times frequency component is divided by the amplitude of the 2-times frequency component to be used formeasuring the common current; and the amplitude of the 10-times frequency component is divided by the amplitude of the 8-times frequency component to be used for measuring and protecting the ultra-heavy current. The high-voltage alternating current sensor can be better applied in the field of high-voltage current sensing.

Description

technical field [0001] The invention relates to a high-voltage AC current measurement and protection sensor, which belongs to the technical fields of photoelectric detection, photoelectric sensing and optical information processing. Background technique [0002] Magneto-optics is an ancient and enduring subject, and its application in the field of optical detection and photoelectric sensing is more and more extensive; the most widely used is the Faraday magneto-optical effect, including current sensors, magnetic field sensors, magneto-optical modulation devices, magneto-optical isolators, magneto-optical circulators, etc. [1] It covers many optical fields such as light detection, light sensing, and optical communication. [0003] The optical current sensor (OCT) based on the Faraday magneto-optical effect has the advantages of good insulation, no magnetic saturation, strong anti-electromagnetic interference ability, and large dynamic range. [2] , There is a tendency to gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04
Inventor 沈骁梁忠诚
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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