Composite insulator defect non-destructive testing system based on microwave band reflection characteristics

Abstract

The invention relates to a nondestructive testing system for defects of a composite insulator based on the reflecting property of a microwave band. The system comprises a femtosecond laser source, a wave guide device, a switch port, an oscillograph and a data analysis module, wherein the femtosecond laser source is used for generating detection signals; the wave guide device is used for connecting the femtosecond laser source with the switch port; the switch port comprises a partial wave mirror surface with bidirectional permeability to microwave band signals and is used for separating incident signals and reflected signals; and the data analysis module is used for carrying out time-domain analysis on the incident signals and the reflected signals, simulating and calculating basic conditions of a composite insulator at a tested point so as to realize defect determination. By utilizing a new composite insulator defect detection manner, internal defects of the composite insulator can be effectively detected.

Description

technical field

[0001] The invention relates to a composite insulator defect nondestructive detection technology, in particular to a composite insulator defect nondestructive detection system based on microwave band reflection characteristics. Background technique

[0002] The physical properties of composite insulators greatly affect their electrical properties when they are hung on the grid. Once the sheath or mandrel has internal or skin defects such as cracks, air gaps, and penetrations, it will easily lead to increased leakage current or even flashover of the grid line. At present, the common defect detection methods of composite insulators are divided into on-line method and off-line method. Among them, the infrared detection method in the online method and the continuous wave microwave detection method in the offline method are two methods commonly used in the prior art.

[0003] Patent CN 103760480 B discloses a composite insulator fault judgment method using infra...

Examples

Embodiment

[0060] combine figure 1 , figure 2 , a non-destructive testing system for composite insulator defects based on microwave band reflection characteristics, including femtosecond laser source, wave guide device, switching port, wave recorder and data analysis module;

[0061] The femtosecond laser source is the generator of the detection signal required by the detection method, and the laser pulse signal width generated by it is femtosecond level, and has good penetration and reflection characteristics.

[0062] The waveguide device is a physical structure connecting the femtosecond laser source and the switching port, aiming to ensure that the original pulse signal can be transmitted to the transmitting end without loss.

[0063] The switching port is a component mainly composed of a mirror with two-way permeability to microwave band signals made of silicon glass material.

[0064] The incident signal α transmitted from the waveguide device is decomposed into the transmitted ...

technical field

[0001] The invention relates to a composite insulator defect nondestructive detection technology, in particular to a composite insulator defect nondestructive detection system based on microwave band reflection characteristics. Background technique

[0002] The physical properties of composite insulators greatly affect their electrical properties when they are hung on the grid. Once the sheath or mandrel has internal or skin defects such as cracks, air gaps, and penetrations, it will easily lead to increased leakage current or even flashover of the grid line. At present, the common defect detection methods of composite insulators are divided into on-line method and off-line method. Among them, the infrared detection method in the online method and the continuous wave microwave detection method in the offline method are two methods commonly used in the prior art.

[0003] Patent CN 103760480 B discloses a composite insulator fault judgment method using infra...

Examples

Embodiment

[0060] combine figure 1 , figure 2 , a non-destructive testing system for composite insulator defects based on microwave band reflection characteristics, including femtosecond laser source, wave guide device, switching port, wave recorder and data analysis module;

[0061] The femtosecond laser source is the generator of the detection signal required by the detection method, and the laser pulse signal width generated by it is femtosecond level, and has good penetration and reflection characteristics.

[0062] The waveguide device is a physical structure connecting the femtosecond laser source and the switching port, aiming to ensure that the original pulse signal can be transmitted to the transmitting end without loss.

[0063] The switching port is a component mainly composed of a mirror with two-way permeability to microwave band signals made of silicon glass material.

[0064] The incident signal α transmitted from the waveguide device is decomposed into the transmitted ...

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