Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Resistivity inversion method of oil-immersed paper for oil-immersed transformers based on dichotomy

A technology of oil-impregnated paper and resistivity, which is applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of insulation damage, inconvenient operation, high cost, etc., and achieve high-precision results

Active Publication Date: 2019-10-11
WUHAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these two materials, the insulation state of transformer oil can be directly sampled for measurement and analysis, while oil-soaked paper sampling needs to be lifted out of the box, which is not only inconvenient to operate, but also causes damage to the insulation, which is costly. dispersion

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
  • Resistivity inversion method of oil-immersed paper for oil-immersed transformers based on dichotomy
  • Resistivity inversion method of oil-immersed paper for oil-immersed transformers based on dichotomy
  • Resistivity inversion method of oil-immersed paper for oil-immersed transformers based on dichotomy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed real-time mode and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0027] Taking a 110kV oil-immersed transformer as an example, the inversion process of its oil-immersed paper resistivity is described. Among them, the given value of the stable insulation resistance is the stable insulation resistance of the high and low voltage sides simultaneously pressurized and the box is grounded.

[0028] Table 1 Actual values ​​of electrical parameters

[0029]

[0030] The concrete steps of this embodiment are as follows:

[0031] In step (1), according to the internal structure of the transformer, the finite element model of the internal insu...

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 oil immersion transformer oil paper electrical resistivity inversion method based on the bisection method. The inversion method comprises the steps that 1, a finite element model of the insulation structure inside a transformer is built by adopting the finite element method according to the inner structure of the transformer; 2, based on the finite element model, the finite elements are computed using the oil immersed paper electrical resistivity as the independent variable and the stabilized insulation electrical resistance of the whole transformer as the dependent variable, and a model of the numerical relationship between the oil immersed paper electrical resistivity and the stabilized insulation electrical resistance is built; 3, based on the numerical relationship model, inversions are performed on the oil immersed paper electrical resistivity by adopting the bisection method, according to the actual values of the oil and electricity resistivity of the transformer and the stabilized insulation electrical resistance. The oil immersion transformer oil paper electrical resistivity inversion method is high in precision, and the shortcomings of a lot of inconveniences in samplings and the large dispersibility and damages to the insulation structures and the like are overcome.

Description

technical field [0001] The invention relates to an oil-immersed power transformer oil-immersed paper aging state evaluation technology, in particular to a dichotomous method-based oil-immersed transformer oil-immersed paper resistivity inversion method. Background technique [0002] Transformers need long-term operation, and it is impossible to completely avoid failures and accidents. There are many reasons for transformer failures and accidents, especially the insulation aging and material deterioration caused by the long-term operation of power transformers, which have become the main factors leading to transformer failures. Since insulating materials work under high temperature and high pressure conditions for a long time, their physical, chemical and electromechanical properties gradually decline with the increase of operating time, and when they develop to a certain extent, insulation damage occurs, resulting in accidents. [0003] For oil-immersed transformers, there ...

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): G06F17/50G01R31/00
CPCG01R31/00G06F30/23
Inventor 阮江军谢一鸣金硕田雨李冠南熊敏
Owner WUHAN 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
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