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Rapid fixed-point method for metallic grounding fault of high-voltage cable joint

A metal grounding, high-voltage cable technology, applied in the fault location, detecting faults according to conductor type, measuring electricity and other directions, can solve the problems of economic loss, wrong cutting, external signal interference, etc. The effect of wrongly cutting the joint

Active Publication Date: 2019-10-18
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The present invention provides a high-voltage cable in order to overcome the above-mentioned problems in the background technology that the fault of the metallic grounding cable is easily interfered by external signals, and the location of the fault point cannot be accurately located, which may lead to miscutting and unnecessary economic losses. Fast method of pinpointing metallic grounding faults of joints

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  • Rapid fixed-point method for metallic grounding fault of high-voltage cable joint
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  • Rapid fixed-point method for metallic grounding fault of high-voltage cable joint

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Embodiment Construction

[0036] 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.

[0037] Such as figure 1 As shown, it is a schematic diagram of the structure of the metallic ground fault cable circuit, including A, B, C three-phase cables, outdoor terminal 1, cross interconnection joint 2, step voltage indicator 3, fault point 4, direct ground joint 5, GIS terminal6.

[0038] Such as figure 2 Shown is a schematic diagram of the stepping power supply workflow, in...

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Abstract

The invention provides a rapid fixed-point method for a metallic grounding fault of a high-voltage cable joint. The method comprises the following steps: (1) inputting a step voltage signal source byan input module, a transformer, a gear switching module, a half-wave rectifying module, a time and driving circuit module and an output module; (2) performing step voltage signal detection by utilizing a step voltage indicator composed of a signal connecting module, a signal filtering circuit module, a signal amplifying circuit module and a galvanometer pointer table; and (3) determining a fault point. According to the method, the position of the fault point can be rapidly and accurately found in the metallic grounding cable fault of the joint, and the interference of external signals is not easily caused.

Description

technical field [0001] The invention relates to the field of cable fault finding, and more specifically, to a method for fast-pointing the metallic grounding fault of a high-voltage cable joint. Background technique [0002] With the country's economic development and urbanization progress, the demand for power cables is increasing year by year, and underground cables have gradually replaced overhead lines and become the main means of urban power supply. 110kV and above high-voltage cables have been widely used in high-voltage power transmission and transformation networks due to their advantages such as less land occupation, convenient laying, personal safety protection, high power supply reliability, and less maintenance workload. The cable in the transmission network is also an extremely complex system, which may contain GIS terminals; may contain T-connectors; may be long-distance lines, including multiple cross-connection segments. When insulation breakdown occurs duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/083G01R31/50
Inventor 南保峰孙廷玺孔德武郭小凯赵尊慧张宽锋黄汉贤李海深曾志华廖雁群
Owner GUANGDONG POWER GRID CO LTD
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