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Cable buffer layer state evaluation method based on electric field analysis

A state assessment and buffer layer technology, which can be used in measuring electricity, measuring electrical variables, and testing dielectric strength, etc., and can solve the problem of less electric field analysis of the buffer layer.

Pending Publication Date: 2020-10-27
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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  • Abstract
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Problems solved by technology

However, most of the current research focuses on the electric field analysis of the cable insulation part, but less on the electric field analysis in the buffer layer

Method used

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  • Cable buffer layer state evaluation method based on electric field analysis
  • Cable buffer layer state evaluation method based on electric field analysis
  • Cable buffer layer state evaluation method based on electric field analysis

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] The present invention is described by taking 220kVXLPE AC cable as an example.

[0041] A method for evaluating the status of cable buffer layers based on electric field analysis, such as figure 1 shown, including the following steps:

[0042] Step 1. XLPE cable running status detection.

[0043] In this step, the XLPE cables in the running state are inspected on-site using technologies such as partial discharge and infrared imaging, and the XLPE cables that may be defective are checked out.

[0044] In the step, partial discharge or infrared imaging technology may be used solely for the detection of the running state of the XLPE cable, or a combined method may be used for state detection.

[0045] Step 2, obtaining the characteristic parameters of the XLPE cables that may have defects.

[0046] In this step, for the XLPE cable that may have defect...

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Abstract

The invention relates to a cable buffer layer state evaluation method based on electric field analysis, and the method is mainly characterized in that the method comprises the following steps: carrying out the state detection of an XLPE cable in an operation state, and checking an XLPE cable which may have a defect; acquiring characteristic parameters of the XLPE cable which may have defects; building a cable structure platform by utilizing finite element software COMSOL, and building a finite element simulation model; adding a physical field; adding materials; setting boundary conditions; setting the grid as a physical field control network; setting a research type, and calculating electric field intensity; and judging the state of the cable buffer layer according to the calculated electric field intensity. The invention is not limited to qualitative analysis of the defect problem of the cable buffer layer any more, a quantitative analysis model is established based on a finite element method, a clear judgment basis is provided, maintainers can make accurate pre-judgment and take measures in advance, serious faults are avoided, and safe and reliable operation of an urban power system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of high-voltage equipment, and relates to cable transmission lines, in particular to a method for evaluating the state of a cable buffer layer based on electric field analysis. Background technique [0002] With the rapid development of my country's economy, the demand for electricity continues to increase, and the requirements for power transmission quality and reliability are getting higher and higher. Due to the intensification of the urbanization process, the electricity consumption in cities is increasing year by year, and the traditional overhead transmission lines have the characteristics of high operation failure rate and poor transmission reliability, so they are gradually eliminated. At present, the urban power transmission network basically adopts cable transmission lines, which have the characteristics of stable power transmission performance, high safety and strong adaptability. In cable transm...

Claims

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Application Information

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IPC IPC(8): G06F30/20G01R31/12G01R31/58G06F113/16
CPCG06F30/20G01R31/1272G01R31/58G06F2113/16
Inventor 李旭于洋李志坚宋鹏先朱明正房晟辰李季方静林国洲魏占朋
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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