Cross interconnection type cable fault identification method, unit and system

Abstract

The invention provides a cross interconnection type cable fault identification method, unit and system. The cross interconnection type cable fault identification method comprises the following steps of collecting current information data; the receiving end processing device receiving the current information data; calculating the ratio of the sheath ring current data to the load current data, and forming an array; and comparing the array with a preset fault array, and performing fault correlation analysis and judgment. According to the cross interconnection type cable fault identification method provided by the invention, types and the fault sections of the cable faults can be accurately identified and judged, the troubleshooting range of safety operation and maintenance personnel is greatly reduced, labor is saved, and operation and maintenance efficiency is improved.

Description

technical field [0001] The present application relates to the technical field of power cables, in particular, to a method, unit and system for fault identification of cross-interconnected cables. Background technique [0002] With the large-scale application of power cables in urban power grids, cable operation status detection and fault diagnosis have also become important modules for cable safety operation and maintenance. [0003] The sheath circulation in the power cable is one of the important parameters reflecting the operating state of the cable. Cable sheath refers to the sealing metal layer wrapped on the outer layer of the cable to prevent moisture from infiltrating the cable. When the wire core in the power cable passes current, the wire core generates electromagnetic induction around it. The magnetic flux generated around the core generates an induced voltage on the cable sheath, which in turn generates an induced current. When the cable sheath is grounded, th...

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Problems solved by technology

[0016] When the current in the cable changes greatly due to the influence of other factors, the sheath circulation value will also change accordingly. The sheath circulation online monitoring device detects the change of the sheath circulation value and judges that the cable is faulty, which leads to the sheath circulation online. False reporting of faults in monitoring devices

[0017] When the cable fails and the change of the sheath circulation value is small, the sheath circulation on-line monitoring device cannot detect the change of the sheath circulation value, resulting in the problem of under-reporting of faults

[0018] 2. The current on-line monitoring device for sheath circulation lacks fault type judgment and diagnosis and positioning means, and cannot timely judge the type of fault and the faulty cable section

[0019] 3. For long-distance (over 1km to 1.5km) power transmission cable lines, it is impossible to improve the troubleshooting efficiency of operators for faults, and it cannot meet the needs of power safety operation and maintenance

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