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All-optical-fiber current transformer and current measuring method thereof

A current transformer, all-fiber technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of poor anti-interference, analog output, small dynamic range, etc., to achieve low cost, eliminate stable phase difference , the effect of stable performance

Active Publication Date: 2017-01-11
CHINA XD ELECTRIC CO LTD
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Problems solved by technology

[0006] The invention provides an all-fiber current transformer and its current measurement method, which can effectively solve the disadvantages of traditional electromagnetic transformers such as large volume, small dynamic range, easy ferromagnetic resonance, high voltage generated by open circuit, and analog output, etc. Eliminates the disadvantages of active electronic transformers such as poor anti-interference, complex structure, and poor stability

Method used

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  • All-optical-fiber current transformer and current measuring method thereof
  • All-optical-fiber current transformer and current measuring method thereof
  • All-optical-fiber current transformer and current measuring method thereof

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

[0031] An all-fiber-optic current transformer based on Faraday's magneto-optical effect principle, which is mainly composed of a sensing unit, a signal processing unit and a merging unit. The sensing unit adopts the Faraday magneto-optic effect principle to sense the current of the conductor under test, generate a light intensity signal and carry the data information of the Faraday optical rotation angle. The signal processing unit mainly completes the input of the optical signal of the sensing unit, the analysis of the output optical signal, digital processing, temperature compensation, etc., and outputs according to the specified synchronous serial mode. The merging unit completes the synchronization and parallel logic of the information of the signal processing unit, and transmits it to the electrical measuring instrument and the rela...

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Abstract

The invention provides an all-optical-fiber current transformer and a current measuring method thereof. The all-optical-fiber current transformer is mainly formed by three parts: a sensing unit, a signal processing unit, and a merging unit. The sensing unit employs the Faraday magneto-optic effect principle and used for inducing current of a measured conductor, and generating light intensity signals carrying data information of the Faraday rotation angle. The signal processing unit mainly completes input of optical singles of the sensing unit, analysis of the output optical signals, digitalization processing, and temperature compensation etc., and performs output according to a prescribed synchronous serial mode. The merging unit completes synchronization, switching or parallel logic of information of the signal processing unit, and transmits the information to an electrical measuring instrument and a relay protection device.

Description

[0001] 【Technical field】 [0002] The invention relates to an all-fiber current transformer based on the Faraday magneto-optical effect principle. It is suitable for electric energy metering, relay protection and power monitoring of GIS. [0003] 【Background technique】 [0004] The current transformer is responsible for the measurement of the current in the power system. As an important part of GIS, the traditional electromagnetic current transformer can no longer meet the smart grid's low cost of current transformer due to its large size, high cost, small dynamic range, easy to generate ferromagnetic resonance, analog output and other unfavorable factors. , small size, good linearity, digital output, safe and reliable requirements. The application of active electronic transformers in switches of 126-252kV voltage level is becoming more and more reliable. Although it has the advantages of small size, digital output, and no magnetic saturation, due to the limitations of its st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/24
Inventor 史方颖白世军于兵刘慧武
Owner CHINA XD ELECTRIC CO LTD
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