Nondestructive testing method for aging degree of composite insulator based on modulation photothermal radiation technology
A technology for composite insulators and aging degree, which is applied in the direction of using optical methods to test, measure electricity, and measuring devices. It can solve the problems that the online nondestructive testing or monitoring of the aging degree of composite insulators cannot be realized, and achieve the effect of high-precision quantitative evaluation.
Active Publication Date: 2022-03-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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This method is a destructive measurement method, which cannot realize online nondestructive testing or monitoring of the aging degree of composite insulators
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[0022] Combine below Figure 1-4 Specifically describe a non-destructive detection method for the aging degree of composite insulators based on modulated photothermal radiation proposed by the present invention.
[0023] figure 1 Shown is a flow chart of the non-destructive quantitative evaluation of the aging degree of an aged composite insulator in the present invention. The modulated photothermal radiation technology is used to measure the amplitude-frequency curve and phase-frequency curve of the photothermal radiation signal of the aged composite insulator non-destructively from the surface, and the parameters with high sensitivity coefficients and the parameters with high sensitivity coefficients among the related parameters affecting the photothermal radiation signal of the composite insulator are determined through sensitivity analysis. For the parameters with low sensitivity coefficients, set the parameters with low sensitivity coefficients to fixed values, and the v...
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The invention relates to a nondestructive testing method for the aging degree of a composite insulator based on a modulation photothermal radiation technology, and the method employs the modulation photothermal radiation technology to measure a relation curve (amplitude-frequency and phase-frequency curve) between the amplitude and phase of a photothermal radiation signal of an aged composite insulator and a modulation frequency. Parameters with high sensitivity coefficients and parameters with low sensitivity coefficients in related parameters of the composite insulator influencing photothermal radiation signals are determined through sensitivity analysis, the parameters with the low sensitivity coefficients are set as fixed values (measured values or literature values or empirical values in other methods), and the parameters with the high sensitivity coefficients are set as free variables. Fitting the measured amplitude-frequency and phase-frequency curve with a two-layer photothermal radiation theoretical model by using multi-parameter fitting to obtain the ratio (namely the ratio of thermal diffusivity) of the thermal diffusivity of the aging layer of the composite insulator to the thermal diffusivity of the non-aging material of the substrate layer and the thickness of the aging layer; and judging the aging degree of the composite insulator according to the obtained thermal diffusivity ratio and the thickness of the aging layer. According to the method, the aging degree of the composite insulator is quantitatively evaluated through the thermal diffusivity ratio and the aging layer thickness accurate value obtained through the nondestructive measurement technology, no damage and no contact are achieved, and online detection of the aging degree of the composite insulator used in a high-voltage power transmission system through the modulation photothermal radiation technology becomes possible.
Description
technical field [0001] The invention relates to a method for detecting the aging degree of composite insulators, in particular to a method for non-destructively measuring the ratio of thermal diffusivity between the aging layer and the base layer of the composite insulator and the thickness of the aging layer to quantitatively evaluate the aging degree of the composite insulator based on the modulated photothermal radiation technology , belonging to the field of high-voltage electrical testing. Background technique [0002] Silicone rubber composite insulators are widely used in high-voltage transmission power systems due to their excellent hydrophobic properties, light weight, unbreakable resistance, and pollution resistance, and play an important role in insulating and supporting transmission lines. Composite insulators will produce aging phenomena. With the increase of the running time of the hanging grid, the surface of the silicone rubber composite insulator will gradua...
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Login to View More IPC IPC(8): G01R31/00G01R31/12
CPCG01R31/003G01R31/1218G01R31/1245
Inventor 李斌成赵斌兴江海涛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA