A system and method for online measurement of cable and accessory interface pressure

Abstract

A system and method for online measurement of interface pressure between a cable and an accessory. The system includes an optical fiber curvature sensing subsystem, an anti-temperature interference subsystem, and a data analysis subsystem; The data is transmitted to the data analysis subsystem. The anti-temperature interference subsystem avoids the influence of temperature on the measurement results. The data analysis subsystem converts the data through the established stress-strain equation of the inner and outer layers of the cable accessories, and displays the pressure values ​​inside and outside the accessories in real time. Wrap the optical fiber sensor on the outer layer of the cable accessory. After the cable accessory is bent and expanded, the polyimide film is bent accordingly, and the fiber Bragg grating pasted on the polyimide film is elongated and shortened respectively, and the corresponding Bragg center wavelength occurs For drift, the fiber Bragg grating demodulator detects the reflected wavelength signal to obtain the value after the wavelength drift of the fiber Bragg grating. The invention can realize the on-line measurement and visual display of the interface pressure between the cable and the accessory.

Description

technical field [0001] The invention belongs to the field of power cable detection, and relates to a system and method for online measuring the interface pressure between a cable and an accessory. Background technique [0002] At present, power cable system failures occur from time to time, and the failures caused by non-external damage are mainly concentrated on cable accessories. The interface pressure between the cable body and the cable accessories is the key to ensure the safe operation of the cable accessories. The uncontrollability of the interface pressure may lead to the displacement of accessories, moisture in the interface, air gap discharge, and local overheating. Breakdown due to surface discharge. At present, the widely used interface pressure measurement methods at home and abroad are offline measurement methods. The thin-film pressure sensor built into the interface is a relatively traditional off-line interface pressure measurement method, and the pressur...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a system and method for on-line measurement of the interface pressure between cables and accessories in order to solve the problems of inconvenient and inaccurate measurement of the interface pressure between cables and accessories in the above-mentioned prior art, which can be real-time and accurate in the running state Detect the change law of the interface pressure of the cable accessories, and realize the online measurement and visual display of the interface pressure between the cable and the accessories

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