Optical fiber Bragg raster temperature monitoring device for high-voltage power cable intermediate joint

Abstract

The invention relates to an optical fiber-based Bragg raster temperature sensor, and belongs to the technical field of photoelectron measuring devices. The optical fiber-based Bragg raster temperature sensors can be used for a temperature measuring technology of a high-voltage power cable intermediate joint. In the monitoring technology, the optical fiber-based Bragg raster temperature sensor comprises a capillary copper pipe 1, a Bragg raster 2, a capillary copper pipe 3, a Bragg raster 4, a capillary copper pipe 5, a Bragg raster 6, a polyimide casing pipe 7, an optical fiber 8, a copper protective shell 9, a copper protective shell 10 and filling glue 11. Three optical fiber Bragg raster temperature sensors are adhered to the copper protective shell 9 to monitor the temperature of common fault points of a power cable joint. A large amount of heat generated by the cable joint due to faults such as overhigh contact resistance, overlarge load current, interior local discharge and the like is transferred to the capillary copper pipe and the raster, and the temperature change of the power cable intermediate joint is converted into the modulation of a peak value of optical fiber Bragg raster wavelength to realize a function of realizing the online monitoring technology by utilizing the optical fiber-based Bragg raster temperature sensors.

Description

technical field [0001] The invention relates to an optical fiber Bragg grating sensor sensitive to temperature changes, in particular to the temperature measurement technology for the middle joint of high-voltage cables. It belongs to the technical field of optoelectronic measurement. Background technique [0002] The power cable has become one of the blood vessels for power transmission, and the intermediate joint of the high-voltage power cable is the weak link in the power cable system, which is prone to failure. The heat generated by the high contact resistance, large load current, and partial discharge accumulation of the middle joint of the power cable makes the temperature of the cable joint rise continuously, accelerates the aging of the cable insulation material, and the leakage current gradually increases, reaching a certain level and causing breakdown or fire. This is a process from quantitative change to qualitative change, so the temperature of the middle join...

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Problems solved by technology

In this public specification, both the temperature sensor and the circuit board are sealed in the insulator, which is difficult to implement, destroys the integrity of the main insulation, and constitutes a safety hazard. Moreover, the data is transmitted by wireless transmission and reception. Due to the strong magnetic field inside the power cable joint, The transmitted data will be disturbed by strong magnetic fields, causing measurement errors

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