Comprehensive monitoring method and system for cable faults and operation states

Abstract

The invention belongs to the technical field of cable monitoring, and discloses a cable fault and operation state comprehensive monitoring method and system, and the method comprises the steps: collecting the amplitude and phase information of a metal sheath current at different frequencies, carrying out the calculation of a cable fault point, and analyzing whether a cable has a fault or not; according to the judged fault, carrying out fault type judgment, and carrying out cable fault positioning; and sending the acquired cable fault point data, the fault type and the fault positioning point information to a background. The invention provides a method for judging the fault type of a cable by monitoring the current information of a metal sheath of the cable, and overcomes the defect that the conventional current monitoring device for the metal sheath of the cable only measures the current and cannot judge the fault information of the cable. The invention provides a method for positioning a cable fault point by monitoring current information of a metal sheath of a cable, and overcomes the defects that the conventional offline cable fault positioning work amount is large and the operation is complicated.

Description

technical field [0001] The invention belongs to the technical field of cable monitoring, and in particular relates to a comprehensive monitoring method and system for cable faults and operating states. Background technique [0002] At present, the power cable is composed of a core conductor, an insulating layer, a filling layer, a metal sheath and an outer protective layer. When the wire core flows through the current, an electromagnetic field will be generated in a certain space, and an effective current path will be formed between the metal sheath and the earth, and a loop current will be generated under the condition of its induced voltage, that is, the grounding loop current of the cable. [0003] In the case of a cable fault, the increase in the current of the metal sheath will cause the temperature of the metal sheath to rise continuously, resulting in a certain degree of weakening of the insulation and shortening the operating life of the cable. [0004] Through the ...

AI Technical Summary

Problems solved by technology

[0005] The traditional cable metal sheath current monitoring device only measures the current and cannot judge the cable fault information

[0006] The traditional offline cable fault location requires a large amount of engineering and cumbersome operations

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