Submarine cable fault alarming and diagnosing method based on distributed optical fiber temperature, strain and vibration monitoring data

Abstract

The invention belongs to the technical field of submarine cable state monitoring, and particularly relates to a submarine cable fault alarming and diagnosing method based on distributed optical fibertemperature, strain and vibration monitoring data. The submarine cable fault alarming and diagnosing method comprises the steps that fiber-breaking faults of sensing optical fibers are diagnosed according to characteristic values of the distributed optical fiber temperature, strain and vibration data; noise reduction processing of monitoring data is conducted through sliding average, reference data in a fault-free state are subtracted from the real-time monitoring data for normalizing; alarming thresholds of the temperature data, the strain data and the vibration data are set, fault alarming and positioning are conducted, and an abnormal area is determined; and by solving the average value of the data in the abnormal area and analyzing statistic and distribution laws of the data larger than the average value, the faults such as electric leakage, short-circuiting, insulation breakdown, anchor smashing, hooking and anchor dragging are diagnosed. According to the submarine cable fault alarming and diagnosing method, the problems of high false alarm rate and high alarm missing rate when the submarine cable state is monitored through a distributed optical fiber sensing technology are solved, and the submarine cable fault alarming and diagnosing method has the advantages that alarming accuracy is high and fault diagnosis can be achieved.

Description

technical field [0001] The invention belongs to the technical field of submarine cable state monitoring, in particular to a submarine cable fault alarm and diagnosis method based on distributed optical fiber temperature strain and vibration monitoring data. Background technique [0002] Submarine cables are an indispensable power lifeline for coastal island power supply, offshore wind power plant power transmission, and oil platform power consumption. Their safe and stable operation is related to the social economy and people's lives. Effective submarine cable status monitoring is very necessary. Over the years, submarine cables have been lacking effective online monitoring methods, and are generally maintained through power outage maintenance and emergency repairs, which are simple and ineffective. [0003] With the development of distributed optical fiber sensing technology, the use of composite optical fibers in submarine cables to monitor the temperature, strain and vibr...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to propose a submarine cable fault alarm and diagnosis method based on distributed optical fiber temperature strain and vibration monitoring data, which is used to solve the problems of false alarm and false alarm rate of submarine cable fault alarm and failure to perform fault diagnosis

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