Optical voltage transformer (OVT) is a new voltage transformer emerging with the development of microelectronics technology, optoelectronic technology and digital technology, which is based on linear photoelectric effect and polarization optics. Compared with traditional transformers, OVT has the advantages of optoelectronic isolation, wide frequency band, high accuracy and wide dynamic range, so ...Show More
An OVT based on Mach-Zehnder interferometer is proposed in this paper, which helps to convert the electro-optic phase delay into the displacement of the interference fringe. And then, the voltage applied to the electro-optic crystal is obtained by positioning the displacement of the fringe, and the effectiveness of this method is verified by experiments. The new OVT meets the requirements of 0.5% ...Show More
This paper puts forward a new method of improving the electro-optic crystal's electric field distributions by attaching some kind of media on the electro-optical crystal. Through the simulation of a 110 kV OVT (Optical Voltage Transducer) the method is proved being effective in improving the distributions of electric field in crystal and reducing the measurement errors caused by an optical path of...Show More
The measurement mode of the existing optical voltage transducer (OVT) is mostly based on light intensity detection. In such a way, the OVT has some big issues, such as a light intensity dependency, a temperature drift, an additional birefringence in the crystal and a half-wave voltage limitation to its measurement range. A new OVT based on conoscopic interference and bi-dimensional position sensit...Show More
Compared with traditional current sensors, the inherent advantages of fiber optic current transformers (FOCT) in terms of passive, immunity to electromagnetic interference, free hysteresis, free saturation, etc., make them quite attractive in high electromagnetic field environments. As a result, a fiber optic voltage measurement scheme (FOCT-OVT) based on FOCT together with a capacitive voltage di...Show More
