Self-induced photoelectric mixed current transformer

Abstract

The invention relates to a self-induced photoelectric mixed current transformer, which detects the ultrahigh voltage large current by using an optical fiber sensor to detect the vibration information of two screws in a double screw spool with an iron core. The self-induced photoelectric mixed current transformer comprises a current bus, a precise Rogowski coil, a double screw spool with the iron core, an optical fiber grating, optical fiber, an optical fiber coupler, an optical fiber vibrating sensor, an optical fiber separator, a wavelength demodulator, a multi-wavelength LD (laser disc) light source, a photoelectric detector and a signal processing unit. The precise Rogowski coil is connected and arranged on the current base, and the double screw spool with the iron core is arranged on the precise Rogowski coil. The double screw spool with the iron core is further connected with the optical fiber grating and the optical fiber vibrating sensor. The optical fiber vibrating sensor is connected to the signal processing unit. The optical fiber grating is downwards connected with the optical fiber and the optical fiber coupler. The optical fiber coupler is further downwards connected to the optical fiber separator and the wavelength demodulator. The optical fiber separator is connected with the multi-wavelength LD light source downwards. The self-induced photoelectric mixed current transformer is simple in integral structure, convenient to operate, good in stability and safe, stable and reliable.

Description

technical field [0001] The invention relates to a photoelectric conversion device in the field of high-voltage electrical appliances and optical measurement, in particular to a self-induction photoelectric hybrid current transformer. Background technique [0002] As the voltage level of the power system continues to rise, the internal insulation of traditional oil-immersed current transformers is becoming more and more difficult, and there is a potential risk of accidents. In recent years, the country has proposed a plan to build a digital grid, making traditional oil-immersed The optical current transformer based on the magneto-optical Faraday effect is a multi-disciplinary theory and application technology integrating optical fiber sensing technology, photoelectric technology, nonlinear optics and advanced signal processing technology. Compared with the traditional high-voltage and large-current transformer technology, the optical current transformer has the advantages of ...

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Problems solved by technology

[0002] As the voltage level of the power system continues to rise, the internal insulation of traditional oil-immersed current transformers is becoming more and more difficult, and there is a potential risk of accidents. In recent years, the country has proposed a plan to build a digital grid, making traditional oil-immersed The optical current transformer based on the magneto-optical Faraday effect is a multi-disciplinary theory and application technology integrating optical fiber sensing technology, photoelectric technology, nonlinear optics and advanced signal processing technology. Compared with the traditional high-voltage and large-current transformer technology, the optical current transformer has the advantages of excellent insulation performance, no magnetic saturation, large dynamic measurement range, and strong anti-electromagnetic interference ability. It has become the next generation of current transformer. However, the development of optical current transformers in the prior art has encountered the problem that the linear birefringence that changes with temperature has a huge impact on the detection results, and this impact cannot be directly eliminated in the system, which makes the research and development encounter a bottleneck , many researchers have lost confidence in this; in addition, the use of Rogowski coil current transformers with the same potential as the primary side, because the signal needs to be processed on the primary side, reduces the reliability and maintainability of the transformer, limiting this type of mutual inductance Promoter

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