Nonlinear compensating circuit for passive biasing all-fiber current transformer

A current transformer and nonlinear compensation technology, applied in the direction of voltage/current isolation, etc., can solve the problems affecting the accuracy of measurement, and achieve the effect of simplifying the signal processing circuit and reducing the cost of the circuit

Inactive Publication Date: 2014-12-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the measured current is large, or the number of sensing fiber turns is large, the nonlinearity will affect the accuracy of the measurement.

Method used

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  • Nonlinear compensating circuit for passive biasing all-fiber current transformer

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Embodiment Construction

[0012] Such as figure 1 As shown, a non-linear compensation circuit of a passive bias all-fiber-optic current transformer, including a passive-bias all-fiber-optic current transformer 1, a photodetector 2, a DC blocking circuit 3, a low-pass filter circuit 4, a nonlinear Compensation circuit 5; the output signal of the passive bias full fiber optic current transformer 1 enters the photodetector 2 to obtain an electrical signal related to the measured current, and the electrical signal is removed by the DC blocking circuit 3 Among them, the DC signal is filtered out by the low-pass filter circuit 4, then enters the nonlinear compensation circuit 5, performs an approximate arcsine operation, and outputs a signal related to the measured current signal and has undergone nonlinear correction. The above-mentioned nonlinear compensation circuit 5 includes: a first multiplier 51, a second multiplier 52, a first coefficient distribution network 53 and a second coefficient distribution ...

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Abstract

The invention discloses a nonlinear compensating circuit for a passive biasing all-fiber current transformer, which belongs to the technical field of testing. The circuit comprises a passive biasing all-fiber current transformer, a photoelectric detector, a blocking circuit, a low-pass filtering circuit and a nonlinear compensating circuit, wherein the output signal of the passive bias all-fiber current transformer enters the photoelectric detector to obtain an electric signal which is relevant to detected current; a direct-current signal is removed from the electric signal through the blocking signal; and the low-pass filtering circuit enters the nonlinear compensating circuit after an alternating-current signal is filtered out through the low-pass filtering circuit, and is used for performing approximate inverse sine calculation and outputting a signal which is relevant to the tested current signal and is corrected nonlinearly. The function of the circuit is completely realized by using simulation circuit elements, so that the nonlinear compensating circuit has a simpler structure and lower cost.

Description

technical field [0001] The invention relates to a non-linear compensation circuit of a passive bias all-optical fiber current transformer, which belongs to the technical field of testing. Background technique [0002] The current transformer is an important equipment for electric energy measurement and relay protection in the power system. With the development of the electric power industry, the voltage operation level is getting higher and higher, and the traditional electromagnetic current transformer has encountered great difficulties in insulation. The current transformer made of optical fiber has natural advantages in insulation, and also has the advantages of anti-electromagnetic interference, wide measurement frequency range, and digital output. It is the development trend of current transformers in the future. [0003] The basic principle of fiber optic current sensing is the Faraday magneto-optical effect, that is, when an external magnetic field is applied, the pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/24
Inventor 肖悦娱颜锦奎
Owner SHANGHAI UNIV
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