All-fiber current transformer for open loop independent double-sampling circuit based on single light path

Abstract

The invention relates to an all-fiber current transformer for an open loop independent double-sampling circuit based on a single light path. The all-fiber current transformer comprises a phase modulation module, a photoelectric detector, a first AD switching circuit, a second AD switching circuit and a double-sampling data processing unit, wherein the phase modulation module comprises a square wave control circuit, a DA switching circuit and a phase modulator which are connected with each other in turn; the phase modulator is arranged in the single light path; the first AD switching circuit and the second AD switching circuit are both connected with the photoelectric detector and the double-sampling data processing unit; the sequence signals in the double-sampling data processing unit and the square wave control circuit are synchronous to each other. The structure adopting the single light path, double AD sampling, respective modulation and synchronous matching square wave for controlling DA switching is adopted by the invention, so that the problem of FOCT (Fiber Optical Current Transformers) dual configuration is solved and the all-fiber current transformer has the advantages of simple structure, small volume, low cost, high integrated degree, and the like.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to an all-optical fiber current transformer based on a single optical path and an open-loop independent double-sampling loop. Background technique [0002] The current transformer plays the role of accurate and fast current measurement in the power grid, and is the core equipment of the smart grid. Electronic current transformer is a new type of transformer developed by comprehensive utilization of modern microelectronics, computer and photoelectric technology, which can solve the problems of complex insulation and poor safety of traditional transformers. The all-fiber-optic current transformer based on the Faraday magneto-optic effect can realize non-intrusive sensing and measurement of high-voltage current, which is completely different from the principle of "mutual inductance". It adopts digital control technology and has the characteristics of safety, accuracy, ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of doubling the configuration and application cost, complex structure and large volume of existing all-optical current transformers due to the dual design, and provides an all-optical current transformer based on an open-loop independent double-sampling circuit based on a single optical path. Single optical path, double AD sampling and demodulation respectively, and synchronous and square wave control DA conversion structure, solve the problem of FOCT dual configuration, with the advantages of simple structure, small size, low cost and high integration

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