Photoelectric AC/DC voltage transducer based on Pockels effect

Abstract

The invention belongs to the technical field of electric power detection and provides a photoelectric AC / DC voltage transducer based on the Pockels effect. The photoelectric AC / DC voltage transducer is not affected by environment temperature change, measurement precision is high, signal transmission is convenient, safety performance is high, power supply is not needed at a measurement point, and optical fiber signal transmission is immune to electromagnetic interference. The photoelectric AC / DC voltage transducer comprises a laser source, a transducer component, transmission fiber, a photoelectric detector and a backward-stage signal processing system, wherein the transducer component comprises a laser collimator I, a polarizer, a 1 / 4 wave plate, a crystal, an analyzer and a laser collimator II which are arranged along an optical path in sequence, the crystal is a cuboid, the length direction of the crystal is the light passing direction, the upper surface and the lower surface, perpendicular to the light passing direction, of the crystal are plated with metal layers serving as detection electrodes, the metal layers are used for loading voltage to be measured, the voltage direction is perpendicular to the light passing direction, and the backward-stage signal processing system obtains the voltage to be measured through a signal output by the photoelectric detector.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to a photoelectric AC / DC voltage sensor. Background technique [0002] For a long time, the primary side voltage signals required by metering and protection equipment in power systems are mainly provided by traditional transformers (mainly including electromagnetic voltage transformers and capacitive voltage divider voltage transformers). Although the traditional transformer has met the requirements of the development of the power system for a long time, with the continuous development of the power system, the continuous increase of power generation and transmission capacity, and the continuous improvement of the grid voltage level, the traditional electromagnetic transformer It has become more and more difficult to meet the development requirements of modern power systems. It has many shortcomings: 1) It is difficult to insulate and bulky. With the incr...

AI Technical Summary

Problems solved by technology

Although the traditional transformer has met the requirements of the development of the power system for a long time, with the continuous development of the power system, the continuous increase of power generation and transmission capacity, and the continuous improvement of the grid voltage level, the traditional electromagnetic transformer It has become more and more difficult to meet the development requirements of modern power systems. It has many shortcomings: 1) It is difficult to insulate and bulky. With the increase of voltage level, its structure becomes more and more complicated, and the cost increases exponentially with the voltage level; 2) ) The dynamic range is small and the response frequency band is narrow; 3) Due to the iron core of the voltage transformer, it may cause ferromagnetic resonance and affect the safety of the equipment; 4) The signal transmission process will also be affected by electromagnetic interference, resulting in insufficient data collection Accurate; 5) Flammable and explosive, there are potential safety hazards

[0004] With the rapid development of advanced optical technology, materials and communication technology, many new topics have begun to study new passive optical fiber voltage sensors in recent years. This type of optical fiber voltage sensor has high measurement accuracy, wide response frequency, and It has the advantages of strong electromagnetic interference ability, but due to the limitations of various processing technologies and material technologies, it is difficult to directly measure the overvoltage in the actual high-voltage power grid.

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