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

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...

AI Technical Summary

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. Equipment depreciation and other issues, in addition, the current calibration device has limited current calibration range and other technical indicators, resulting in problems such as high cost, cumbersome testing process, and low efficiency in testing the dynamic characteristics of optical fiber current transformers.

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