An integrated detection system and method for temperature and partial discharge of power equipment

Abstract

The invention discloses an integrated detection system and method for electric equipment temperature and partial discharge, comprising: a tunable narrowband laser scans the FBG multiple times to obtain the average reflection spectrum of the FBG, and the relationship between the central wavelength of the average reflection spectrum and the temperature Obtain the temperature information of the device under test; in addition, immediately after the temperature detection is completed, the wavelength value λ corresponding to the maximum linear slope of the FBG reflection spectrum steep The output wavelength of the tunable narrowband laser can be set to accurately detect whether the partial discharge occurs. Through the method, the same FBG detection system can be used as the basis to detect both the temperature of the electric equipment and its partial discharge, greatly improving the detection efficiency and saving the detection cost.

Description

technical field [0001] The optical sensing measurement technology of the present invention relates to the field, specifically, an integrated detection system and method for electric equipment temperature and partial discharge. Background technique [0002] Fiber Bragg Grating (FBG) is a kind of grating whose core refractive index changes periodically. It is sensitive to both temperature and strain. It can be used to detect the temperature and partial discharge of electrical equipment. The detection principle is: each time the FBG is scanned A reflection spectrum is obtained, and the central wavelength of the reflection spectrum is determined by the period of the grating and the refractive index of the fiber core. When the ambient temperature changes, the thermal expansion and thermo-optic effects produced by the FBG will change its period and the refractive index of the fiber core, thereby causing the FBG reflection spectrum Offset, using the one-to-one correspondence betwee...

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Problems solved by technology

[0003] However, most of the existing detection technologies for temperature and partial discharge of power equipment are to detect temperature and partial discharge separately, and there is no mature technology based on one FBG to detect both temperature and partial discharge. There is a problem of cross-sensitivity when the temperature of power equipment is detected for partial discharge

On the one hand, when FBG detects the temperature of electrical equipment, the partial discharge pulse will cause many "burrs" in the FBG reflection spectrum, which may easily cause misjudgment of the peak value of the spectrum, and the peak value of the reflection spectrum corresponds to the central wavelength of the FBG, and the central wavelength of the FBG corresponds to the temperature. Therefore, the misjudgment of the spectral peak value will affect the temperature detection results; on the other hand, the accurate detection of partial discharge in power equipment depends on the condition that other factors other than partial discharge cannot cause the FBG reflection spectrum to shift, and the temperature change of power equipment will cause FBG reflection spectrum shifts, which in turn affects the sensitivity of partial discharge detection

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