Railway water supply pipe network leakage detection system and method based on time domain reflection technology

Abstract

The invention relates to the technical field of water supply pipe networks, in particular to a railway water supply pipe network leakage detection system and method based on a time domain reflection technology. The system involves a rail located on the ground, a time domain reflectometer and a metal water supply pipe located under the ground, wherein a first signal receiving and transmitting end of the time domain reflectometer is electrically connected with the rail, a second signal receiving and transmitting end of the time domain reflectometer is electrically connected with the metal water supply pipe, and the first signal receiving and transmitting end of the time domain reflectometer, the rail, the soil, the metal water supply pipe and the second signal receiving and transmitting end of the time domain reflectometer are sequentially conducted to form a reflection electric loop of a voltage step signal. In accordance with the characteristics of the railway water supply pipe network, the rail, metal pipelines or a metal tracing line are adopted as a signal output end / receiving end, earth soil is adopted as a conductor to form a closed loop, and the leakage point of the pipe network is determined by detecting the strength of the received signal and identifying the abnormal point of the dielectric constant of the soil. The method does not need to excavate present pipelines, it is guaranteed that the railway normally works, and the method has the advantages of simple and convenient operation, low investment cost, high identification precision and fast speed.

Description

technical field [0001] The invention relates to the technical field of water supply pipe networks, in particular to a leak detection system and method for railway water supply pipe networks based on time domain reflection technology. Background technique [0002] my country is short of water resources, and the per capita possession of water resources is only 2,300 cubic meters, equivalent to about 1 / 4 of the world's average level. With the increase of population and rapid economic development in my country, the contradiction between supply and demand of water resources continues to intensify. Under the condition of existing water resources, it is imminent to reduce the amount of water leakage and improve the utilization efficiency of water resources. According to the survey, the leakage rate of domestic urban water supply pipe network is more than 15%, and the leakage rate of railway water supply pipe network is more than 20%, while the water supply leakage rate of developed...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a railway water supply pipe network leak detection system and method based on time-domain reflection technology, which solves the above-mentioned existing railway water supply pipe network leak detection requirements of experienced personnel, the difficulty of installing sensors in old pipe networks and the High investment cost, high rate of false positives in leakage point identification, low positioning accuracy, and time-consuming technical problems

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