All-optical circuit voltage measurement system and method based on inverse piezoelectric effect and fiber grating

A technology of inverse piezoelectric effect and optical fiber grating, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of destroying surrounding equipment and staff safety, heavy PT weight, and drifting of working points, etc., to achieve Strong anti-electromagnetic interference ability, small size, and strong anti-electromagnetic interference ability

Active Publication Date: 2019-04-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PTs commonly used in power grids have disadvantages such as heavy weight, narrow frequency band, and large volume.
This kind of equipment is too heavy and bulky. When real-time monitoring data and operating status control cannot be obtained, once a failure occurs, there is a risk of explosion. If an accident occurs, it will threaten or destroy the safety of surrounding equipment and staff
In the new optical voltage measurement system based on photoelectric crystal, due to the inherent birefringence effect of electro-optic crystal, it is easy to cause the drift of the operating point when the ambient temperature changes. The current temperature compensation measures are not enough to eliminate the drift of the operating point. Influence of the measurement accuracy by the sensor

Method used

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  • All-optical circuit voltage measurement system and method based on inverse piezoelectric effect and fiber grating
  • All-optical circuit voltage measurement system and method based on inverse piezoelectric effect and fiber grating
  • All-optical circuit voltage measurement system and method based on inverse piezoelectric effect and fiber grating

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Embodiment 1

[0045] As shown in the figure, the voltage measurement system provided by this embodiment includes a broadband laser light source, a voltage sensor, a transmission fiber, a photoelectric detector, and an end signal display processing system. The broadband laser light source outputs laser light within a certain wavelength range, and transmits The optical fiber sends the optical signal to the input end of the sensor, and the output light intensity changes under the action of the applied voltage. The photodetector converts the output light intensity signal into a voltage signal, and the measured applied voltage value is obtained through the terminal signal display processing system.

[0046]The voltage sensor includes an optical circulator 01 , a grating GA and a piezoelectric ceramic PA, an optical circulator 02 , a grating GB and a piezoelectric ceramic PB arranged in sequence along the optical path. The gratings are directly bonded to the corresponding piezoelectric ceramics, a...

Embodiment 2

[0064] see figure 1 , the voltage measurement system of this embodiment includes a broadband laser light source 1, a transmission fiber 2, a voltage sensor 3, a photodetector 4 and a signal display processing system 5, the broadband laser light source 1 outputs laser light within a certain wavelength range, and passes through the transmission fiber 2 Send the light signal to the input terminal of the sensor 3, the output light intensity changes under the action of the applied voltage and input to the photodetector 4, the photodetector 4 converts the output light intensity signal into a voltage signal, and displays the signal through the end signal processing system 5, Obtain the value of the measured applied voltage.

[0065] The voltage sensor includes a first optical circulator 01 , a first grating GA and a first piezoelectric ceramic PA, a second optical circulator 02 , a second grating GB and a second piezoelectric ceramic PB arranged in sequence along the optical path. T...

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Abstract

The invention discloses an all-light-path voltage measuring system based on an inverse piezoelectric effect and fiber bragg grafting. The system comprises a broadband laser light source, a voltage transducer reference unit, a voltage transducer sensing unit, a transmission optical fiber, a photoelectric detector, and a tail end signal displaying and processing system; laser sends a photosignal to an input end of the voltage transducer reference unit through the transmission optical fiber, and the input end of the voltage transducer reference unit is connected to the voltage transducer sensing unit; an externally-arranged voltage is arranged on the voltage transducer sensing unit; the voltage transducer sensing unit outputs a light intensity signal carrying signal information of a voltage to be detected; the light intensity signal is input to the photoelectric detector; the photoelectric detector converts the output light intensity signal into a voltage signal, and the voltage signal generates a numerical value of the detected externally-arranged voltage through the tail end signal displaying and processing system. The invention further discloses an all-light-path voltage measuring method based on the inverse piezoelectric effect and the fiber bragg grafting. The provided all-light-path voltage measuring system based on the inverse piezoelectric effect and fiber bragg grafting has the advantages of being passive, strong in capacity of resisting electromagnetic interference, wide in response frequency band, and good in power frequency response.

Description

technical field [0001] The invention relates to the technical field of power detection, in particular to an all-optical circuit voltage measurement system and method based on inverse piezoelectric effect and fiber grating. Background technique [0002] Real-time measurement of grid voltage is of great significance for system protection, line fault monitoring and measurement. The PTs commonly used in power grids have disadvantages such as heavy weight, narrow frequency band, and large volume. This kind of equipment is too heavy and bulky. When real-time monitoring data and operating status control cannot be obtained, once a failure occurs, there is a risk of explosion. If an accident occurs, it will threaten or destroy the safety of surrounding equipment and staff. In the new optical voltage measurement system based on photoelectric crystal, due to the inherent birefringence effect of electro-optic crystal, it is easy to cause the drift of the operating point when the ambien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0046
Inventor 杨庆何彦霄孙尚鹏司马文霞袁涛杨鸣孙魄韬韩睿罗曼丹
Owner CHONGQING UNIV
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