Novel optical path sensing unit for low-voltage optical current sensor

Abstract

The present invention discloses a novel optical path sensing unit for a low-voltage optical current sensor. The unit comprises a light source, an optical fiber isolator, an optical fiber depolarizer, an optical fiber coupler, a photoelectric detector and a second unit. The light source, the optical fiber isolator, the optical fiber depolarizer, the optical fiber coupler and the second unit are connected with each other through the optical fiber. The photoelectric detector is connected with the optical fiber coupler, the second unit is connected with a conductor, the optical axis direction of the second unit is perpendicular to the current direction of the conductor, and the second unit includes an optical fiber collimator, a polarizer, a magneto-optical crystal, a Faraday rotator and a reflector. The novel optical path sensing unit for the low-voltage optical current sensor solves the problems that the optical path structure of the current optical current sensor is complex, many kinds of optical devices are required the technology realization difficulty is big, the engineering installation difficulty is big and the product cost is high. In addition, the measurement sensitivity is ensured.

Description

technical field [0001] The invention relates to the technical field of optical current sensing, in particular to a novel optical path sensing unit for a low-voltage optical current sensor. Background technique [0002] Current sensor is an important device for electric energy measurement and protection control in power system and smart grid. Its measurement accuracy and operational reliability are closely related to the safe and economical operation of power system. [0003] Traditional electromagnetic current transformers expose a series of serious shortcomings in engineering operation, such as: low linearity, easy saturation in short circuit, small static and dynamic accuracy range, possible ferromagnetic resonance, complex insulation structure, bulky, flammable Explosive, etc., that is, its safety and transient performance are difficult to fully meet the development needs of the continuous increase of power transmission and transformation capacity of the power system and ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: compared with the prior art, it provides a new type of optical path sensing unit for low-voltage optical current sensor, while ensuring the measurement sensitivity of the optical path sensing unit, it solves the problem of existing optical current sensing unit. The optical path structure of the sensor is complex, many types of optical devices are required, the process is difficult to realize, the engineering installation is difficult, and the product cost is high

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