XLPE cable insulation state evaluation method based on discharge energy difference

A state evaluation and cable insulation technology, which is applied in the field of XLPE cable insulation state evaluation based on the discharge energy difference, can solve the problems of insulation performance damage, poor evaluation effect, and hidden dangers of safe and stable operation of the power system, so as to avoid insulation breakdown and guarantee Reliable operation and the effect of improving the utilization rate of equipment assets

Active Publication Date: 2021-03-26
SOUTHWEST JIAOTONG UNIV
View PDF18 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the early cable manufacturing process and laying technical conditions, coupled with the long service life, its insulation performance has been severely damaged, which has brought great hidden dangers to the safe and stable operation of the power system. Once a failure occurs, it will affect the national economy and social stability. seriously affected the lives of the people
[0003] At present, evaluation methods for the insulation state of XLPE cables are still relatively scarce, and the evaluation effect is poor. Therefore, research on methods for effectively evaluating the insulation state of XLPE cables provides a basis for maintenance personnel to further explore the service performance of cables, and is of great help to ensure the reliable operation of cables, It is of great significance to improve the utilization rate of equipment assets

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • XLPE cable insulation state evaluation method based on discharge energy difference
  • XLPE cable insulation state evaluation method based on discharge energy difference
  • XLPE cable insulation state evaluation method based on discharge energy difference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] figure 1 Shown is the flow chart of the method for evaluating the insulation state of XLPE cables based on the difference in discharge energy, which includes the following steps:

[0022] Step 1: Partial discharge test on XLPE cables:

[0023] After connecting the XLPE cable to the partial discharge measuring instrument, use the step-up method to pressurize the cable, starting from 0kV and stepping up to the rated operating voltage of 10kV with a gradient of 1kV. There are 10 levels of voltage in total. for U a , a=1,2,3,…,10, and collect the discharge amount-phase after each level of voltage is kept constant data;

[0024] Step 2: Calculate the total energy difference ΔW of the positive and negative half-cycle discharges at all voltage levels a :

[0025]

[0026] In the formula, U a is the voltage value of each level, a=1,2,3,...,10, i is the number of phase windows, i=1,2,3,...,360, N is the i-th phase window phase The number of discharges at , q i,n for...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an XLPE cable insulation state evaluation method based on discharge energy difference. The method comprises the following steps: performing partial discharge test on an XLPE cable, calculating the total discharge energy difference of positive and negative half cycles under each level of voltage, calculating the standardization coefficient of the total discharge energy difference of positive and negative half cycles under each level of voltage, calculating an insulation state evaluation parameter, and evaluating the insulation state of the cable by using the evaluation parameter. The method has the advantages that the insulation state of the XLPE cable can be evaluated efficiently, accurately, safely and conveniently, and insulation breakdown caused by serious degradation of cable insulation is avoided; the insulation state of the cable can be judged, a basis is provided for a maintainer to further explore the service performance of the cable, and the method hasgreat significance in guaranteeing reliable operation of the cable and improving the equipment asset utilization rate.

Description

technical field [0001] The invention relates to the field of cable insulation state evaluation, in particular to an evaluation method for XLPE cable insulation state based on discharge energy difference. Background technique [0002] With the continuous development of my country's economy, the scale of cities and towns is getting larger and larger, and the construction of power facilities is also in progress. Power cables are an important factor that determines the safety and stability of power systems. The cable runs in a strong electric field, high temperature, and humid environment for a long time, and is subjected to the synergistic effects of electricity, heat, machinery, and chemistry, which causes physical and chemical changes in the insulation, accelerates the process of cable insulation degradation, and eventually causes cable breakdown and insulation. invalidated. my country began to put cross-linked polyethylene (XLPE) cables into the power transmission and distr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 周利军杨涵刘聪
Owner SOUTHWEST JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap