Current measurement method, electronic type current transformer utilized, and new application of the current transformer

A current transformer and current measurement technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., to achieve the effect of large dynamic range, high measurement accuracy and small size

Inactive Publication Date: 2005-11-16
向渝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the many shortcomings of existing electromagnetic induction transformers, one of the purposes of the present invention is to provide a transformer sui

Method used

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  • Current measurement method, electronic type current transformer utilized, and new application of the current transformer
  • Current measurement method, electronic type current transformer utilized, and new application of the current transformer
  • Current measurement method, electronic type current transformer utilized, and new application of the current transformer

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Example Embodiment

[0045] See figure 1 , A current measurement method that uses a current magnetic field sensor head composed of a strong magnetostrictive amorphous alloy sheet and piezoelectric ceramics that is closely integrated with the power transmission bus, and the linear magnetic field generated by the current flowing through the power transmission bus It becomes a voltage analog signal and transmits this voltage analog signal to the electro-optical conversion device; the electro-optical conversion device converts this voltage analog signal into an analog optical signal, and then sends the analog optical signal to the ground potential side through the optical fiber; on the ground potential side, The photoelectric conversion device converts the analog optical signal into an analog electrical signal for output. At the same time, the analog electrical signal output by the photoelectric conversion device can be converted into a digital signal through A / D and output for users to choose. Users can...

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Abstract

A current measuring method includes utilizing current magnetic field sensing probe formed by piezoelectric ceramic and amorphous alloy to convert current linear magnetic field to be voltage analog signal and sending it to electrooptical converting element where converts electrooptical analog signal to be analog light signal and sends it to earth potential side, converting said light signal to be analog electric signal and converting this electric signal to be digital signal by A / D converter for outputting. The electrical current mutual inductor of the method is also disclosed.

Description

technical field [0001] The invention relates to a current measurement method suitable for current measurement, relay protection, automatic control and early fault on-line monitoring of electrical equipment in the power system grid, as well as the electronic current transformer used in the current measurement method and the New uses for transformers. Background technique [0002] At present, the current transformers used for current measurement and relay protection in the power system grid are mainly based on the principle of electromagnetic induction. The current signal is obtained by connecting the primary coil in series in the power line, and the external circuit of the secondary winding is connected with a measuring instrument or The relay protection and automatic control device completes the functions of current measurement, equipment protection and automatic control. The primary and secondary windings are wound on the iron core of the electromagn...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 欧阳南尼向渝
Owner 向渝
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