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Fiber grating-based transformer internal temperature detection system

A fiber grating and internal temperature technology, which is applied in the direction of physical/chemical change thermometers, thermometers, instruments, etc., can solve the problem of large positioning errors of transformers

Active Publication Date: 2012-08-08
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +2
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Judging from the current research results, the temperature measurement error of the distributed optical fiber temperature measurement system is generally several degrees Celsius, and the positioning error is about one meter. For the monitoring of the internal temperature of the transformer, the positioning error is obviously larger

Method used

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  • Fiber grating-based transformer internal temperature detection system
  • Fiber grating-based transformer internal temperature detection system
  • Fiber grating-based transformer internal temperature detection system

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] The working principle of the system of the present invention is as follows: figure 1 shown. The principle of use is as follows. The broadband light source is reflected by the Bragg grating into narrow-band light, and its reflection wavelength is determined by the grating period. When the external temperature changes or the strain acts on the grating, the fiber grating period and effective refractive index change, and then the reflection wavelength When the change occurs, the demodulator converts the wavelength-coded sensor signal into a digital signal and sends it to the computer for calculation and processing. After the transformer works for a period of time, the temperature of the transformer winding will rise, so that the reflection wavelength of the fiber grating attached to the winding will change. The wavelength of the F-P cavi...

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Abstract

The invention provides a fiber grating-based transformer internal temperature detection system, which comprises a light source, fiber grating sensors, a grating signal demodulation system, a signal processing display instrument and data analysis software, wherein the fiber grating sensors are arranged on a winding and a strut of a transformer and sensing points at other positions in the transformer and used for sensing measurement of transformer temperature, stress and local discharge parameters; the grating signal demodulation system receives the measured data of the fiber grating sensors, and accurately demodulates corresponding light signals of the temperature, stress and local discharge parameters; the signal processing display instrument performs correction processing such as temperature compensation, stress sensitivity removal and the like on the measured signals, and displays real-time data on an instrument panel; and the data analysis software performs programming software analysis on the processed data to acquire real-time transformer internal temperature field and temperature change, and then performs transformer internal temperature monitoring and full service life assessment. The system realizes real-time measurement of temperature of multiple points in the transformer through the photoelectric sensors, and provides a good foundation for economic operation of the transformer.

Description

technical field [0001] The invention relates to the fields of optical fiber grating sensing and transformer state monitoring, in particular to a temperature detection system inside a transformer based on optical fiber gratings. Background technique [0002] Power transformers are important equipment in modern power systems, and the temperature of their windings is directly related to the service life of power transformers and the operation safety of power transmission and transformation systems. Therefore, each substation needs to monitor the temperature of the transformer. The insulation and aging rate of the transformer are related to the hot spot temperature of the winding. Exceeding the allowable limit of the temperature will not only reduce the operating life of the transformer, but also pose a threat to the safe operation of the transformer. If the temperature of the hot spot of the winding is too low, the capacity of the transformer will not be fully utilized, reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
Inventor 程林聂德鑫关庆华伍志荣周建华邓建钢刘诣杜振波宋友杨俊
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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