Closed-loop optical fiber current transformer

Abstract

The invention provides a closed-loop optical fiber current transformer, which comprises a light source, a light source control unit, a photoelectric detector, an optical device integrated assembly and a sensing head. An optical path system of the transformer is simple in structure and convenient in integration and modularization; a used optical element is small in volume and light in weight and free of electromagnetic interference, and has no interference on measured amount; and a reflection type optical path and a simple optical device are used for achieving mode interchange of orthogonal polarized light so as to form a reciprocity optical path and improve anti-interference capacity of the optical path. The multi-closed-loop technology is adopted, system measurement error caused by light source power attenuation and half-wave voltage drift of an optical is overcome, and stability and reliability of the transformer are improved.

Description

technical field [0001] The present invention relates to an optical fiber current transformer, in particular to a current transformer with a closed-loop all-optical fiber scheme. Its sensing components and optical signal transmission components are both optical fibers, and its signal processing part adopts a multiple correlation detection scheme. closed-loop technology. Background technique [0002] The current transformer is one of the most basic and important detection equipment in the power transmission and transformation network. Its functions mainly include: 1. Reduce the large current value in the high-voltage environment on the transmission line to a value that can be directly measured by a secondary instrument 2. Provide electrical signals for various monitoring and protection equipment to monitor the safe and stable operation of the power system; 3. Isolate high-voltage primary equipment and low-voltage secondary equipment . [0003] Therefore, the performance of c...

AI Technical Summary

Problems solved by technology

In high-voltage, high-current and high-power power systems, this traditional current transformer exposes a series of serious disadvantages: potential sudden failure hazard, insulation difficulty, core magnetic saturation, secondary side load open circuit, etc.

[0006] However, the existing optical fiber current transformers have the following disadvantages: 1. The structure of the optical path system is complex, which is not conducive to system integration; 2. The components in the optical path are easily affected by working conditions such as temperature, the measurement error is large, and closed-loop feedback cannot be realized.

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