Composite insulator and method for detecting brittle fracture of composite insulator based on fiber Bragg grating

Abstract

The invention provides a composite insulator, including a core rod, a metal fitting, a sheath and an shed, and also includes at least two optical fibers located between the core rod and the sheath, and at least two of the optical fibers are fixed on the core rod On the surface, each of the optical fibers includes a grating coverage area and a pigtail, and in the grating coverage area of ​​each of the optical fibers, a plurality of devices for obtaining the wavelength offset to judge the brittle fracture are arranged along the length direction of the optical fiber. Fiber Bragg Grating. It also provides a method for detecting the brittle fracture of the composite insulator based on the fiber Bragg grating, including obtaining the wavelength shift of the fiber Bragg grating; judging the composite insulator according to the measured wavelength shift of the fiber Bragg grating arranged at different positions on the surface of the mandrel. The brittle fracture location and brittle fracture degree. The invention uses the wavelength offset value as an early warning to monitor the brittle fracture process of the composite insulator, can monitor the brittle fracture process of the composite insulator efficiently, accurately and intuitively in real time, and can replace the traditional inspection of the composite insulator.

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

Images