Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Evaluation method of xlpe insulation aging state based on different frequency dielectric loss ratio

A technology for insulation aging and state assessment, applied in the direction of testing dielectric strength, measuring devices, instruments, etc., can solve the problems of inability to truly reflect the system state, large dispersion of test data, etc., to reduce system errors and the impact of the external environment , The effect of eliminating uneven aging and convenient engineering application

Active Publication Date: 2018-08-31
XI AN JIAOTONG UNIV +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to make up for the problem that the state assessment of XLPE insulation by dielectric loss measurement at a frequency of 50Hz or 0.1Hz is seriously affected by the test system and the external environment, the test data is highly dispersed, and cannot truly reflect the state of the system. The purpose of the present invention is to provide a The method for evaluating the aging state of XLPE insulation based on the ratio of dielectric loss at different frequencies, the method of the present invention is based on the relative ratio of the measured values ​​of dielectric loss at two characteristic frequencies to effectively evaluate the aging state of XLPE insulation

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
  • Evaluation method of xlpe insulation aging state based on different frequency dielectric loss ratio
  • Evaluation method of xlpe insulation aging state based on different frequency dielectric loss ratio
  • Evaluation method of xlpe insulation aging state based on different frequency dielectric loss ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be described in more detail below in combination with specific embodiments.

[0023] The method for effectively evaluating the aging state of XLPE insulation based on the relative ratio of dielectric loss measurement values ​​at two characteristic frequencies proposed by the present invention includes the following steps:

[0024] Step 1: Prepare the sample;

[0025] Taking the new 110kV AC XLPE cables that have been in operation for 16 years and 24 years as the object, take a cable section about 100mm long respectively, remove the conductor core and strip off all parts except the insulation shield, and perform circumferential cutting along the cable circumferential direction (such as peeling fruit), cut the insulating layer ring into a film strip-shaped insulating XLPE insulating sheet with a thickness of about (0.2±0.02) mm, divide the insulation into three parts along the radial direction, and call it the inner layer from the inside to the ...

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

A method for evaluating the aging state of XLPE insulation based on the dielectric loss ratio of different frequencies, comprising the following steps: preparing sliced ​​samples of the inner, middle and outer layers of the cable insulation; performing dielectric loss measurements of the samples under the same conditions at 50Hz and 0.1H voltage ;Obtain the dielectric loss ratio of each sample at 0.1Hz and 50Hz, on this basis, calculate the dielectric loss ratio of each insulation layer and the insulation as a whole; according to the size and change law of the dielectric loss ratio of each layer, and the overall insulation The size of the dielectric loss ratio evaluates the aging state of the AC or DC cable XLPE insulation; according to the method of the present invention, the influence of uneven aging at different positions can be eliminated, which is conducive to reflecting the overall state of the insulation, and the aging degree of the AC and DC cable XLPE insulation Accurate evaluation; the sample size required for the test is small, and the voltage and capacity requirements of the test instrument are low; the ratio of the dielectric loss measurement value at different frequencies is used as the characteristic parameter, which reduces the system error of the test instrument and the influence of the external environment; no need Compared with historical data, engineering application is convenient.

Description

technical field [0001] The invention relates to a method for evaluating the aging state of XLPE insulation, in particular to a method for evaluating the aging state of XLPE insulation based on the measurement and comparison of dielectric loss tangents of polymer solid media at different frequencies. Background technique [0002] Dielectric loss tangent (tanδ, hereinafter referred to as "dielectric loss") is an important performance parameter to describe the insulation state of dielectric materials and electrical equipment. Dielectric loss can reflect the overall defects of the insulation (such as overall aging) and serious local defects (such as water trees); from the curve of dielectric loss versus voltage, it can be judged whether the insulation is damp, contains air bubbles, and the degree of aging; the relationship between it and the breakdown voltage There is also a monotone corresponding relationship between dielectric loss and breakdown voltage decrease; these all sho...

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 Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 刘英王林杰肖阳苏宇廖一帆张福增王国利
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com