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

Evaluation method of transformer substation grounding grids

A technology of substation grounding grid and grounding grid, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as performance failure, small grounding down-conductor cross-section, poor grounding body connection, etc., and achieve high accuracy and smooth calculation process clear effect

Active Publication Date: 2015-04-29
STATE GRID CORP OF CHINA +1
View PDF4 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the grounding grid is a hidden facility buried deep underground in the power system. The main technical problems exposed on site are corrosion of the grounding grid, small cross-section of the grounding down-conductor, and poor connection between grounding bodies. These problems are caused by power failures. Hidden danger
The corrosion of the ground grid is a gradual process. When the corrosion reaches a certain level, it will enter the fault state, the reliability will be reduced or even the performance will fail, which cannot meet the requirements of the safe operation of the power system.

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 transformer substation grounding grids
  • Evaluation method of transformer substation grounding grids
  • Evaluation method of transformer substation grounding grids

Examples

Experimental program
Comparison scheme
Effect test

example

[0071] Choose Q235 steel in coastal areas,

[0072] W=f c v,

[0073] By calculating w=0.877(mm / a);

[0074] S g1 =Ig / c·t e -2 , the stable value of short-circuit current Ig flowing through the grounding wire is calculated according to 75% of the maximum short-circuit current of the busbar in the 220kV substation field area, that is, Ig is 46.319×0.75=34.74kA, and c is 70. t e = 0.2s.

[0075] S g1 =Ig / c·t e -2 =34.74×10 3 / 70·0.2 -2 =221.94mm 2

[0076] n select 1 year.

[0077] S g2 =(A-2×w×n)(B-2×w×n)=(6-2×0.877×1)(60-2×0.877×1)

[0078] =247.31mm 2

[0079] by S g1 and S g2 The comparative analysis shows that the service life of the grounding grid in this area is 1 year.

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 relates to an evaluation method of transformer substation grounding grids. The evaluation method comprises the following steps: (1) deriving the thinning speed of metal thickness of a grounding grid by applying the faraday's law; (2) determining the minimal section area Sg of a grounding wire without considering corrosion; (3) determining the minimal section area Sg2 when considering the influence of the corrosion factor; and (4) determining the evaluation years of the grounding grid. According to the method, the calculation process is clear, the accuracy rate is high, and the theoretically powerful support is provided for the safety running of a power system grounding grid.

Description

technical field [0001] The invention belongs to the technical field of substation grounding grids, in particular to an evaluation method for substation grounding grids. Background technique [0002] Grounding technology involves numerical analysis and optimal design of electrical parameters of the grounding system, analysis of soil structure parameters, resistance reduction technology in areas with high soil resistivity, scientific measurement of grounding resistance, corrosion diagnosis technology of grounding grids, and impact characteristics of grounding devices. A large number of literatures show that the main research results of the grounding grid are concentrated in three aspects. One is the testing, analysis and optimal design of grounding system parameters. Not only grounding impedance, but also its step voltage, contact voltage and potential distribution on the grounding grid should be considered. Secondly, the electrical integrity, heat capacity, and resistance of ...

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): G01N17/00
Inventor 郭军科于金山苏展卢立秋郝春艳邵林刘鸿芳其他发明人请求不公开姓名
Owner STATE GRID CORP OF CHINA
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