Cable tunnel temperature monitoring system based on distributed optical fiber temperature measuring method

Abstract

The invention discloses a cable tunnel temperature monitoring system based on a distributed optical fiber temperature measuring method. The system aims at solving the technical problem about how to accurately monitor the temperature distribution condition of a cable tunnel in real time. By the adoption of the technical scheme, the cable tunnel temperature monitoring system based on the distributedoptical fiber temperature measuring method is provided with a pulse laser, a wavelength division multiplexer, a photoelectric converter and a signal processing unit, wherein the pulse laser, the wavelength division multiplexer, the photoelectric converter and the signal processing unit are sequentially connected, and the wavelength division multiplexer is connected with a multi-mode sensing optical fiber. Compared with the prior art, optical fiber temperature distributed information of the cable tunnel is extracted through Raman scattered light signals, the temperature distribution conditionof the cable tunnel can be accurately monitored in real time, the status of the cable tunnel can be known in real time by maintenance staff, fault hidden danger can be predicted before occurring, probably-existing faults can be processed in time, and therefore losses are reduced.

Description

technical field [0001] The invention relates to the field of temperature monitoring of a power system, in particular to a cable tunnel temperature monitoring system. technical background [0002] The smart grid of the power system includes power plants, high-voltage power grids, substations, distribution stations, etc., specifically including power equipment such as generators, transformers, power cables, and switches. Power equipment usually works in high voltage, strong electric field, heat load and other environments, and the working environment is unattended and unmanned. As an engineering infrastructure, the smart grid involves the electricity demand of thousands of households. The operating temperature of power equipment is an important factor to ensure the safe operation of the smart grid. Whether it is a transformer, a power cable, or other power equipment, as an important part of the power system, some circuit problems or external factors may cause local overheatin...

AI Technical Summary

Problems solved by technology

The single-point temperature sensor measures a certain point in the temperature field, which has high measurement accuracy and reliability, but it is difficult to measure the multi-point distribution of the temperature field

In order to solve the measurement problem of multi-point distribution of the temperature field, a quasi-distributed optical fiber temperature sensor composed of a multiplexed optical fiber temperature sensor and an array of optical fiber temperature sensors has emerged. The quasi-distributed optical fiber temperature sensor uses a single-point optical fiber sensor array to form a spatial network distribution. To achieve distributed optical fiber temperature measurement, measurement accuracy and speed will be affected due to resolution, bandwidth or spatial structure, and accurate temperature measurement and positioning cannot be performed

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