All-fiber optical current transformer detection system

Abstract

The invention discloses an all-fiber optical current transformer detection system. The all-fiber optical current transformer detection system comprises a sensing optical fiber ring, a light path system, a circuit system and a merging unit; the sensing optical fiber ring is used for acquiring a current signal of a to-be-detected position and generating a light intensity signal carrying data information of a Faraday rotation angle; the light path system is used for transmitting the data information to the circuit system by virtue of the optical fiber; the circuit system is used for receiving data information transmitted by the light path system and converting the data information to a circuit digital signal; the merging unit is used for receiving the circuit digital signal generated by the circuit system and outputting an identification signal. The current transformer adopts a special optical fiber winding way, so that the temperature drift can be effectively inhibited, the influence of the birefringence phenomenon on detection precision of an ordinary optical fiber transformer can be overcome, the birefringence phenomenon is influenced by the temperature, so that the precision drift of the detection precision caused along with the temperature variation exists.

Description

technical field [0001] The invention relates to the field of intelligent detection of power grids, in particular to an all-optical fiber current transformer detection system. Background technique [0002] With the rapid development of the smart grid, the current transformer, one of the basic core equipment, has also ushered in a period of rapid development. In addition to being used in smart grids, current transformers have also been successfully used in many industrial fields such as ship electrical systems, grid traveling wave distance measurement, high-voltage DC power transmission, DC ice melting, power quality monitoring, etc., to achieve current and voltage-based Measurement applications of various electrical parameters. At present, it is being widely used in the fields of the highest voltage level of 1000kV in my country, new energy grid-connected flexible DC power transmission, rail transit power, and thermonuclear fusion international cooperation large scientific p...

AI Technical Summary

Problems solved by technology

[0003] Traditional current transformers use Rogowski coils, but such Rogowski coils are easily disturbed by strong electromagnetic fields

Explosions or measurement inaccuracies caused by traditional transformers due to poor insulation reliability, electromagnetic saturation, electromagnetic resonance and other defects reduce the safety and stability of power grid operation

Traditional transformers need to consume a large amount of non-ferrous metals such as copper and aluminum, causing pollution to the atmosphere and water

[0004] There are problems of adaptability to the environment and long-term stability of optical fiber current and voltage transformers in the application process of power systems

And the modulation coefficient of fiber optic current and voltage transformers drifts with temperature, which affects the long-term stability of transformers

Images