High-voltage crosslinked polyethylene cable grounding current mechanism and fault analysis method

Abstract

The invention discloses a high-voltage crosslinked polyethylene cable grounding current mechanism and fault analysis method. The method mainly includes the steps of carrying out modeling on a crosslinked grounding method connection diagram, building a mathematic model for cable crosslinked grounding current calculation, programming by means of the mathematic model for cable crosslinked grounding current calculation, calculating cable sheath grounding currents after programming, analyzing high-voltage cable sheath grounding currents on the basis of the calculation result of the cable sheath grounding currents, and analyzing faults of a grounding current system on the basis of the analysis result of the high-voltage cable sheath grounding currents. The high-voltage crosslinked polyethylene cable grounding current mechanism and fault analysis method overcomes the defects that in the prior art, the application range is small, precision is low, and utilization is inconvenient to achieve, and has the advantages of being large in application range, high in precision and convenient to use.

Description

technical field [0001] The invention relates to the technical field of cable maintenance, in particular to a grounding current mechanism and fault analysis method of a high-voltage cross-linked polyethylene cable. Background technique [0002] With the development of the city, the number of applications of single-core high-voltage power cables of 110 kV and above has increased sharply, and the cable load has increased day by day. focus on. In order to reduce the induced voltage on the cable sheath so that it will not be too large, the cable sheath should be grounded in sections in the project to limit the magnitude of the induced voltage. However, if the grounding method is improper, the induced voltage will form a large grounding current on the metal sheath, which will bring two major hazards to the cable transmission line. Therefore, the metal sheath of the high-voltage cable must adopt the correct grounding method. Ensure that circulating currents are minimized for prop...

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Problems solved by technology

[0006] At this stage, the research on XLPE cables, especially the research on the grounding current of its metal sheath is still not in-depth, and there are many limitations: the length of the power cable is relatively short, generally about 1 km; the metal sheath The calculation of induced voltage and circulating current is mainly used for cable construction rather than cable fault discrimination; there are many studies on double-ended grounding and single-ended grounding systems, and there are few mathematical models for common cross-connection grounding and analysis

[0007] In the process of realizing the present invention, the inventor found that there are at least defects such as small application range, low precision and inconvenient use in the prior art

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