Electro-optic effect based optical voltage transformer

摘要

An electro-optic effect based optical voltage transformer comprises an optical voltage sensor 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 to the optical voltage sensor head and the optical voltage sensor head is connected to the signal processing unit. In this invention, the light source output power is more stable, the light source center wavelength drift is effectively controlled and the output power coastdown caused by light source aging is prevented; the optical power fluctuation of the optical polarization caused by factors such as temperature, optical fiber vibration, etc., is eliminated, which is conductive to stability and reliability of the optical system; the accuracy of data is improved.

主权项

1. An optical voltage transformer, comprising:
an optical voltage sensor head; and an electrical unit including an optical closed-loop feedback control unit and a signal processing unit, wherein:
the optical closed-loop feedback control unit is connected to the optical voltage sensor head by optical fiber and the optical voltage sensor head is connected to the signal processing unit by optical fiber;the optical closed-loop feedback control unit provides a light source with stable output power, and this stable light source is transmitted to the optical voltage sensor head by optical fiber; andthe signal processing unit processes the optical signal detected and output by the optical voltage sensor head and demodulates the measured voltage;the optical voltage sensor head comprises a first optical fiber collimator, a polarizer, a ¼ wave plate, a BGO crystal, an analyzer, a second optical fiber collimator and a third optical fiber collimator;the first optical fiber collimator is connected to one end of the polarizer, the other end of the polarizer goes through the ¼ wave plate and the BGO crystal successively and then is connected to the analyzer, after the analyzer it is divided into two paths, one path of reflection end goes through the second optical fiber collimator and then is output by the optical fiber to the signal processing unit, the other path of transmission end goes through the third optical fiber collimator and then is output by the optical fiber to the signal processing unit.