Measurement Method of Optical Current Transformer Based on Dual-Wavelength Structure
A technology of current transformer and measurement method, which is applied in measurement devices, measurement of electrical variables, voltage/current isolation, etc., can solve problems such as the influence of measurement results, and achieve the effect of avoiding inaccurate measurement results and simple system structure
Inactive Publication Date: 2018-10-19
TIANJIN UNIV
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The change of temperature will change the Verdet constant of the material, so it will have a certain impact on the measurement results
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[0019] Such as figure 1 Shown is a schematic structural diagram of the optical current transformer based on the dual-wavelength structure of the present invention. Wherein, the light source is a double light source (the first light source 1 and the second light source 2), and the two light sources have different wavelengths, and the light emitted by the two light sources enters the same optical fiber through the fiber coupler coupling 3, and the light beam passes through the first collimator 9 After being collimated, it enters the polarizer 10, and after passing through the polarizer 10, it becomes polarized light and enters the magneto-optic crystal 11, and the light emitted by the magneto-optic crystal 11 passes through the polarization beam splitter prism 12 and becomes two beams of light whose polarization directions are perpendicular to each other , a beam of light is output by the second collimator 13, and then the light of different wavelengths is separated by the first...
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The invention discloses an optical current transformer based on a dual-wavelength structure. The optical current transformer comprises a first light source 1, a second light source 2, an optical fiber coupler 3, a sensor 4, a first wavelength division demultiplexer 5, a second wavelength division demultiplexer 6, a first photoelectric detector 7 and a second photoelectric detector 8, which are connected in sequence through optical fibers. The sensor 4 is internally provided with the following optical elements in sequence: a first collimator 9, a polarizer 10, a magneto-optical crystal 11, a polarization splitter prism 12, a second collimator 13 and a third collimator 14. The measurement method comprises the following steps: obtaining function relationship between the temperature and Verdet constants of the magneto-optical crystal under two different wavelengths; in the actual measuring process, obtaining rotation angles theta1 and theta2 of two polarized light beams of different wavelengths obtained after passing through the magneto-optical crystal under the effect of an external magnetic field; and carrying out calculation to obtain the temperature T and the magnetic field intensity H, and finally obtaining the measured current value according to the relation between the current I and the generated magnetic field H. Therefore, accuracy of measurement result is improved.
Description
technical field [0001] The invention relates to the technical field of optical current transformers, in particular to an optical current transformer based on a dual-wavelength structure and a method for measuring its magnetic field and current. Background technique [0002] As a new type of current transformer, the optical current transformer has the advantages of large dynamic range, non-proportional relationship between measurement range and cost, and good insulation performance, so it has received extensive attention. But at the same time, it also has some defects. One of the main aspects is that because the Verdet constant of the magneto-optic crystal is affected by temperature, it will cause certain errors in the measured value under different ambient temperatures, which will affect the measurement accuracy. The general measurement process of an optical current transformer based on the Faraday effect is: the natural light emitted by the light source enters the collimato...
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IPC IPC(8): G01R15/24
CPCG01R15/245G01R15/246
Inventor 胡浩丰韩佳慧刘铁根俞明轩黄柄菁
Owner TIANJIN UNIV