Cable buffer layer repair effect evaluation method based on capacitance current analysis

Abstract

The invention relates to a cable buffer layer repair effect evaluation method based on capacitance current analysis. The method is mainly characterized by comprising the steps of detecting the operation state of a crosslinked polyethylene cable buffer layer, obtaining fault cable parameters of the crosslinked polyethylene cable buffer layer, measuring the capacitance current of a crosslinked polyethylene cable conductor before repair, carrying out buffer layer repairing work on the fault cable, measuring the capacitance current of the crosslinked polyethylene cable conductor after repair, calculating the capacitance current change rate of the buffer layer fault cable before and after repair, and judging the repair effect grade; calculating the resistivity of the repaired buffer layer, and judging the effectiveness of the repair effect; and integrating the repair effect grade and the repair effectiveness evaluation result to complete cable repair effect evaluation. The method is reasonable in design, the electrical performance defect repair effect of the buffer layer of the high-voltage crosslinked polyethylene cable can be effectively evaluated, the implementation method is accurate, reliable and easy to implement, and the method has important significance in guiding cable repairing work.

Description

technical field [0001] The invention belongs to the technical field of high-voltage cables, and relates to a high-voltage cable repair method, in particular to a method for evaluating the repair effect of a cable buffer layer based on capacitive current analysis. Background technique [0002] With the rapid development of urbanization in my country, the proportion of electricity consumption in cities is increasing, accounting for more than 80% of the total electricity consumption in the country. The ever-increasing demand for electricity and the increasingly tight urban land use make more and more electricity transmission methods adopt underground cable transmission, and its proportion can reach more than 70%. [0003] Cross-linked polyethylene (XLPE) cables have become the mainstream choice for land-based urban power transmission projects due to their excellent electrical properties, heat resistance, and ease of installation. At present, almost all of the newly built urban ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to propose a method for evaluating the repair effect of the cable buffer layer based on capacitive current analysis, and to solve the problem that the repair effect of the electrical performance defect of the high-voltage XLPE cable buffer layer cannot be effectively evaluated at present

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