Abstract
Railway power transmission lines (RPTL) are power lines that provide nontraction power supply for railways, such as communications and signals along the railway. With the advancement of technology, power cables are being used more and more widely. Operational experience has shown that during the operation of power cables, abnormal heat is often caused by fault factors such as poor joint crimping and severe partial discharge caused by insulation defects, leading to cable burns in extreme cases. Distributed temperature sensors (DTS), a kind of spatial continuous temperature sensor using sensing optical fiber, can measure the temperature along the cable and are expected to realize on-line monitoring and positioning of cable heating faults. This paper first builds a finite element model of the cable under various faults to calculate the distribution characteristics of the temperature field of the faulty cable. Then the results are verified through experiments with the external sensing fiber and the artificially manufactured heating points of the cable. The conclusions show that it is feasible to use a distributed sensing fiber to monitor and locate the heating fault of power cable.
Highlights
Distributed temperature sensing (DTS) via optical fiber has the advantages of antielectromagnetic and mechanical interference and space continuous measurement, which is suitable for temperature monitoring of long-distance cable in Railway power transmission lines (RPTL)
Optical fiber composite cable (OFCC) is a composite structure of optical fiber and cable, which has the advantages of compact structure and high mechanical strength
To eliminate the maloperation brought by the environment temperature and the measurement error of Distributed temperature sensors (DTS), an algorithm of distributed optical fiber for online monitoring and fault location of cable is proposed for the first time
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Distributed temperature sensing (DTS) via optical fiber has the advantages of antielectromagnetic and mechanical interference and space continuous measurement, which is suitable for temperature monitoring of long-distance cable in RPTL. Optical fiber composite cable (OFCC) is a composite structure of optical fiber and cable, which has the advantages of compact structure and high mechanical strength These will make the DTS monitor the temperature of the cable more effectively [20,21,22,23]. To eliminate the maloperation brought by the environment temperature and the measurement error of DTS, an algorithm of distributed optical fiber for online monitoring and fault location of cable is proposed for the first time. The temperature of the cable is monitored by arranging optical fiber and a thermocouple, and the temperature measurement effect between them is compared
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