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Fault diagnosis and positioning method for cross-connected high-voltage cable sheath protector

A high-voltage cable, fault diagnosis technology, applied in the fault location, the phase angle between voltage and current, and the detection of faults by conductor type, etc. , to ensure the effect of safe operation

Active Publication Date: 2020-06-09
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

[0006] In order to overcome at least one defect described in the above-mentioned prior art, the present invention provides a fault diagnosis and location method for a cross-connected high-voltage cable sheath protector, by performing live detection on the high-voltage cable sheath current, and comparing the results of different detection currents The phase difference can realize the fault diagnosis and location of the sheath protector, so as to solve the problem of difficult fault diagnosis and location of the sheath protector at present

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  • Fault diagnosis and positioning method for cross-connected high-voltage cable sheath protector

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[0032] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

[0033] A method for fault diagnosis and location of cross-connected high-voltage cable sheath protectors based on sheath current phase difference, the main process of which is as follows figure 1 shown.

[0034] A schematic diagram of a high-voltage cable cross-connection large section is shown in figure 2 As shown, the simplified schematic diagram of the sheath circuit is shown in...

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Abstract

The invention relates to the technical field of high-voltage cable lines, in particular to a fault diagnosis and positioning method for a cross-connected high-voltage cable sheath protector. The faultdiagnosis and positioning method for the cross-connected high-voltage cable sheath protector comprises the following steps: 1, obtaining a current signal of a high-voltage cable sheath; and 2, carrying out fault diagnosis and positioning on the sheath protector according to a preset standard and a diagnosis method. According to the invention, in high-voltage cable sheath current inspection, detection current data can be effectively utilized, and faults of the sheath protector can be found and positioned in time such that subsequent replacement of the fault protector is facilitated, the safetyof the high-voltage cable sheath and insulation is effectively protected, and the safe operation of a cable line is ensured. According to the technical scheme, the difficulty of data application in protector fault diagnosis in current sheath current detection is overcome, and the problem that current sheath protector fault detection depends on manual observation and offline detection is solved.

Description

technical field [0001] The invention relates to the technical field of high-voltage cable lines, and more specifically, to a fault diagnosis and positioning method for a cross-connected high-voltage cable sheath protector. Background technique [0002] High-voltage cable lines are an important part of urban power grids. Due to the requirements of urban beauty and power supply quality, the scale of high-voltage cable lines has grown rapidly. The high-voltage cable provides a stable zero-potential reference point and reliable shielding for its operation through the grounding of the metal sheath. Cross interconnection grounding can not only reduce the current loss of the sheath through the mutual cancellation of the induced voltage of the three-phase sheath during normal operation of the line, but also provide a fault current loop for high-voltage cable faults, so it is widely used. In order to protect the outer sheath insulation and metal sheath of high-voltage cables from li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R25/00
CPCG01R31/088G01R31/083G01R25/005Y04S10/52
Inventor 廖雁群韦亦龙李迪李奕霖伍斯恒李闻博曾啸周灏史筱川李剑袁永毅李智宇
Owner GUANGDONG POWER GRID CO LTD
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