Passive optical voltage transformer based on electrooptical effect

Abstract

The invention discloses a passive optical voltage transformer based on electrooptical effect, which comprises an optical voltage sensing head and an electrical unit, wherein the electrical unit comprises an optical closed-loop feedback control unit and a signal processing unit; the optical closed-loop feedback control unit is connected with the optical voltage sensing head; and the optical voltage sensing head is connected with the signal processing unit. The output power of an SLD (Super Luminescent Diode) light source is more stable, the shift of central wavelength of the SLD light source is effectively controlled, the problem that the output power is reduced because of the aging SLD light source can be prevented; the optical power fluctuation of the optical path polarization state caused by the factors, such as temperature and optical fiber, can be eliminated, the stability and the reliability of the optical path system are improved; one fourth of the influence of wave plate temperature performance on the system is weakened; and the accuracy of the data is improved.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a passive optical voltage transformer based on the electro-optic effect. Background technique [0002] High-voltage power transformers are the most basic measuring equipment for power systems for metering, control and relay protection. With the continuous improvement of the voltage level of the power system, the traditional electromagnetic induction or capacitive voltage divider has many limitations that are difficult to overcome due to the limitation of the sensing mechanism. Optical voltage transformer is a new type of transformer that uses optoelectronic technology and optical fiber sensing technology to realize voltage measurement. Compared with the traditional transformer, the high-voltage signal of the optical voltage transformer is transmitted to the secondary equipment through the optical fiber, the insulation is greatly simplified, the bandwidth is high, the dyn...

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Problems solved by technology

[0005] At present, most of the existing optical voltage transformers have the situation that the luminous wavelength of the light source changes with the temperature and the output power is unstable; in the bonding process, multiple discrete optical components will inevitably have a slight shift during the curing process. Affect the accuracy of the azimuth angle; and the drift of the follow-up electronic circuit will directly bring errors to the optical signal due to temperature changes, reducing the stability of the system; in addition, in terms of modulation methods, compared with horizontal modulation methods, longitudinal Modulated optical voltage transformers also have problems such as high insulation cost under high voltage, disproportionate output signal and electric field, and difficult signal demodulation.

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