CN-121978463-A - Submarine cable fault positioning device and method

CN121978463ACN 121978463 ACN121978463 ACN 121978463ACN-121978463-A

Abstract

The invention relates to the field of cable fault positioning, in particular to a submarine cable fault positioning device and method; the method comprises the steps of installing a plurality of sensors in a submarine cable, collecting signal data in the submarine cable through the sensors, sorting the collected signal data to obtain optical fiber signal data, analyzing the optical fiber signal data to obtain an abnormal optical fiber section, signal abnormal data and optical fiber abnormal data, analyzing the signal abnormal data and the optical fiber abnormal data to obtain a cable fault section and a fault abnormal signal, analyzing the abnormal optical fiber section, the fault abnormal signal and the cable fault section to obtain an abnormal cable signal, fault positioning coordinates and fault abnormal values, and maintaining and managing the submarine cable through the abnormal cable signal, the fault positioning coordinates and the fault abnormal values. The invention can improve the precision of the fault positioning method.

Inventors

TONG BO
WANG TUANJIE
XIE XIAOJUN
LI YANG
Fan Weizhe

Assignees

西安热工研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260227

Claims (10)

1. The submarine cable fault positioning method is characterized by comprising the following steps of: s1, collecting and sorting signal data of a plurality of sensors to obtain optical fiber signal data, wherein the sensors are arranged in a submarine cable; S2, performing time logic verification on the optical fiber signal data, and setting an abnormal optical fiber section if the time logic is not met; if the signal waveform repeatability analysis is met, setting the repeated signal quantity lower than the signal beam value as optical fiber abnormal data and the repeated signal quantity higher than the signal beam value as signal abnormal data based on the signal waveform repeatability analysis; S3, comprehensively analyzing the abnormal optical fiber section, the cable fault section and the fault abnormal signal to obtain an abnormal cable signal, a fault positioning coordinate and a fault abnormal value, and further maintaining and managing the submarine cable until the cable is normal.
2. The submarine cable fault location method according to claim 1, wherein in S1, the signal data comprise a monitoring number, a sensor number, signal data and collection time, the optical fiber signal data are obtained by grouping the signal data of the same sensor number and combining the signal data according to the sequence of the monitoring numbers, monitoring sites are arranged at each collection time, and the monitoring numbers are marked into the corresponding monitoring sites.
3. The submarine cable fault location method according to claim 1, wherein in S2, the time logic verification method is to check whether the collection time corresponding to each monitoring site on the same optical fiber increases in sequence from small to large according to the number of the monitoring group, and if the collection time does not meet the increasing rule, the collection time is determined to be not in accordance with the time logic.
4. The submarine cable fault location method according to claim 1, wherein in the step S2, the process based on signal waveform repeatability analysis is that complex analysis signals are obtained through hilbert transformation, whether the complex analysis signals among monitoring sites with the same monitoring number are the same or not is compared, the number of the signals with the same waveform is counted, and the number of the signals is compared with a preset signal beam value.
5. The submarine cable fault location method according to claim 1, wherein in the step S2, the process of extracting fault features of the optical fiber abnormal data is that the length of a sliding window is set, the signal data is traversed, the local maximum value is identified, a fault location line is generated, and the peak of the fault location line is marked as a cable fault interval.
6. The submarine cable fault location method according to claim 1, wherein in the step S2, fault feature extraction is performed on the signal abnormal data, wherein the process comprises the steps of calculating an instantaneous envelope of a complex analysis signal, and identifying a signal segment corresponding to an envelope peak as a fault abnormal signal.
7. The submarine cable fault location method according to claim 1, wherein in S3, the step of obtaining fault location coordinates and fault outliers comprises: Numbering analysis is carried out on the abnormal optical fiber section to generate an abnormal cable signal; calculating the time difference of the cable fault interval, and obtaining fault positioning coordinates and fault abnormal values by combining the signal propagation speed and a GIS method; And carrying out propagation time difference calculation on the fault abnormal signals, extracting fault characteristic data through a fault diagnosis model, outputting fault types and fault positioning coordinates, and calculating fault abnormal values.
8. A submarine cable fault location device, comprising: the data acquisition and analysis module is used for collecting and sorting signal data of a plurality of sensors to obtain optical fiber signal data, and the sensors are arranged in the submarine cable; the fault positioning module is used for performing time logic verification on the optical fiber signal data, setting the optical fiber signal data as abnormal optical fiber intervals if the optical fiber signal data does not accord with the time logic, setting the repeated signal quantity lower than a signal beam value as optical fiber abnormal data based on signal waveform repeatability analysis if the optical fiber signal data accord with the time logic, and setting the repeated signal quantity higher than the signal beam value as signal abnormal data; and the maintenance module is used for comprehensively analyzing the abnormal optical fiber section, the cable fault section and the fault abnormal signal to obtain an abnormal cable signal, a fault positioning coordinate and a fault abnormal value, and further carrying out maintenance management on the submarine cable until the cable is normal.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the submarine cable fault location method according to any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the subsea cable fault location method according to any one of claims 1 to 7.

Description

Submarine cable fault positioning device and method Technical Field The invention relates to the field of cable fault positioning, in particular to a submarine cable fault positioning device and method. Background With global importance on green energy, offshore wind power, high-voltage direct current (HVDC), transnational power interconnection and other projects rapidly develop, and the laying number and coverage of submarine cables are remarkably increased. Submarine cables are used as key infrastructure in the fields of transoceanic communication, offshore wind power grid connection, power remote transmission and the like, and are widely applied to a plurality of important scenes such as communication, energy sources, military and the like. With the continuous expansion of the application scale, the stability and reliability of submarine cable systems are highly valued. Common submarine cable fault detection and positioning methods mainly comprise a Time Domain Reflectometry (TDR), a Frequency Domain Reflectometry (FDR), a pulse current method, an alternating current bridge method, a distributed optical fiber temperature/vibration sensing technology (such as DTS and DAS) and the like. The submarine environment is complex and changeable, such as geological movement, seawater corrosion, ship anchor dragging, biological damage and other external factors, submarine cables are extremely prone to faults, such as short circuits, circuit breaks, poor grounding, cable sheath damage and the like, and the common fault positioning method is low in precision and affects the cable fault maintenance efficiency. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a submarine cable fault positioning device and a submarine cable fault positioning method, so as to solve the problems that the precision of a submarine cable fault positioning method is low and the maintenance efficiency of a cable fault is affected in the prior art. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: a method of locating a submarine cable fault, comprising the steps of: s1, collecting and sorting signal data of a plurality of sensors to obtain optical fiber signal data, wherein the sensors are arranged in a submarine cable; S2, performing time logic verification on the optical fiber signal data, and setting an abnormal optical fiber section if the time logic is not met; if the signal waveform repeatability analysis is met, setting the repeated signal quantity lower than the signal beam value as optical fiber abnormal data and the repeated signal quantity higher than the signal beam value as signal abnormal data based on the signal waveform repeatability analysis; S3, comprehensively analyzing the abnormal optical fiber section, the cable fault section and the fault abnormal signal to obtain an abnormal cable signal, a fault positioning coordinate and a fault abnormal value, and further maintaining and managing the submarine cable until the cable is normal. The invention further improves that: Preferably, in the step S1, the signal data comprise a monitoring number, a sensor number, signal data and collection time, the optical fiber signal data are obtained by grouping and combining the signal data of the same sensor number according to the sequence of the monitoring numbers, monitoring sites are arranged at each collection time, and the monitoring numbers are marked into the corresponding monitoring sites. Preferably, in S2, the method of time logic verification is to check whether the collection time corresponding to each monitoring site on the same optical fiber increases in sequence from small to large according to the monitoring group number, and if the collection time does not meet the increasing rule, the collection time is determined to be not in accordance with the time logic. Preferably, in S2, the process based on signal waveform repeatability analysis is to obtain complex analysis signals through hilbert transformation, compare whether the complex analysis signals between monitoring sites with the same monitoring number are the same, count the number of signals with the same waveform, and compare the number with a preset signal beam value. Preferably, in the step S2, the process of extracting the fault feature of the optical fiber abnormal data is that the sliding window length is set, the signal data is traversed, the local maximum value is identified, a fault location line is generated, and the peak of the fault location line is marked as a cable fault section. Preferably, in S2, the process of extracting the fault characteristics of the signal abnormal data is that calculating the instantaneous envelope of the complex analysis signal, and identifying the signal segment corresponding to the peak of the envelope as the fault abnormal signal. Preferably, in S3, the step of obtaining the fault location coordinates and the fault abnormal