Method for calibrating dynamic performances of fiber optical current transducer (FOCT) based on voltage modulation

A fiber-optic current and calibration method technology, which is applied to instruments, measuring electrical variables, measuring devices, etc., can solve problems such as large energy consumption, high cost of fiber-optic current transformers, and equipment depreciation

Inactive Publication Date: 2013-03-20
SOUTHEAST UNIV
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Problems solved by technology

[0004] At present, the dynamic characteristics test and calibration process of optical fiber current transformers is completed on the high-current test platform. During the test and calibration process, large-current circuit breakers, special signal generators, calibration devices, etc. are required. Equipmen

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  • Method for calibrating dynamic performances of fiber optical current transducer (FOCT) based on voltage modulation
  • Method for calibrating dynamic performances of fiber optical current transducer (FOCT) based on voltage modulation
  • Method for calibrating dynamic performances of fiber optical current transducer (FOCT) based on voltage modulation

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] Depend on figure 1 It can be seen that the digital closed-loop system of optical fiber current transformer is mainly composed of light source, coupler, polarizer, phase modulator (also known as integrated optical chip, IOC), wave plate, photodetector and optical fiber ring.

[0049] The light emitted by the light source passes through the coupler, polarizer, and wave plate to form two kinds of circularly polarized light waves, and then enters the optical induction ring. The light intensity change of the interference signal is detected at the detector, and after photoelectric signal amplification, filtering, and A / D conversion processing, it is sent to the FPGA / DSP signal processing system to form a closed-loop feedback voltage signal to modulate the electro-optic phase modulator, so that the phase modulator A non-reciprocal feedback com...

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Abstract

The invention discloses a method for calibrating dynamic performances of an FOCT based on voltage modulation. Additional voltage modulation phases are introduced in a digital closed-loop signal processing process of the FOCT to simulate optical nonreciprocity Farady phases caused by power line currents, segment treatment is performed to output data of the FOCT by using a segment modulation phase method to calibrate scale factors of the FOCT, and the linearity, the symmetry and the repeatability of the scale factors of the FOCT are analyzed. According to the method, the method starts from a digital closed-loop signal processing process of the FOCT, dynamic performances of the FOCT are estimated overall, the method has the advantages of being simple and direct in testing process and high in calibration accuracy, and test calibration of a plurality of sets of FOCTs can be completed for one time.

Description

technical field [0001] The invention belongs to the technical field of electrical measurement, and relates to a method for quickly calibrating the dynamic performance of an optical fiber current transformer based on voltage modulation. Background technique [0002] Optical fiber current transformers overcome the limitations of electromagnetic current transformers in terms of accuracy, dynamic range, and DC measurement. Not only the fundamental wave measurement is accurate, but also the DC and harmonics can be accurately measured. With the advantages of good performance and high measurement accuracy, it can meet the needs of continuous development in the fields of power metering, power quality monitoring, protection control, fault recording, and power grid dynamic observation. It represents the development direction of current transformers and adapts to the development needs of smart grids. . Optical fiber current transformer is an important member in the field of optical fi...

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 王立辉袁博文刘刚
Owner SOUTHEAST UNIV
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