Composite insulator and method for detecting brittle failure of composite insulator based on fiber gratings

Abstract

The invention provides a composite insulator, which comprises a core rod, a fitting, a sheath and an umbrella skirt, and further comprises at least two optical fibers positioned between the core rod and the sheath, the at least two optical fibers are fixed on the surface of the core rod, each optical fiber comprises a grating coverage area and a tail fiber. And a plurality of fiber bragg gratingsfor acquiring wavelength offset to judge brittle failure are arranged in the grating coverage area of each optical fiber along the length direction of the optical fiber. The invention also provides amethod for detecting brittle failure of the composite insulator based on the fiber bragg grating. The method comprises the following steps: acquiring wavelength offset of the fiber bragg grating; andjudging the brittle failure position and the brittle failure degree of the composite insulator according to the wavelength offsets measured by the fiber bragg gratings arranged at different positionson the surface of the core rod. According to the method, the brittle failure process of the composite insulator is early warned and monitored through the wavelength deviation value, the brittle failure process of the composite insulator can be efficiently, accurately and visually monitored in real time, and traditional routing inspection of the composite insulator can be replaced.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of power transmission and transformation insulation equipment, in particular to a composite insulator and a method for detecting brittle fracture of the composite insulator based on an optical fiber grating. Background technique [0002] Composite insulators are responsible for insulation performance and mechanical support performance in transmission lines. Its brittle fracture (referred to as brittle fracture) accident is very harmful to the power system. The load is much lower than the normal fracture load, and the fracture time is unpredictable, which often leads to disconnection. Even cause major accidents such as falling towers. The traditional composite insulator detection technology mainly detects the operation status of transmission line insulators through regular inspections by inspectors, on-site observation and detection methods. The existing composite insulator detection met...

AI Technical Summary

Problems solved by technology

However, this ultrasonic testing method cannot efficiently, accurately, and intuitively detect the brittle fracture of composite insulators, let alone monitor the operating status of composite insulators online 24 / 7

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