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

Directly buried cable current-carrying capacity finite element calculation method considering soil heat and humidity coupling

A technology of flow calculation and calculation method, applied in calculation, computer-aided design, electrical digital data processing, etc., can solve the problems of not carefully evaluating the impact and biased results, so as to reduce the workload and improve the transmission capacity Effect

Pending Publication Date: 2020-05-19
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the calculation of ampacity of direct buried cables is generally calculated according to the IEC 60287 standard, but the IEC standard can only meet the calculation of ampacity under a single soil thermal resistance, and the results obtained are biased
[0004] Existing numerical calculation methods only consider the temperature field and electromagnetic field, and as a typical porous medium, the influence of moisture migration inside the soil on the temperature field, electromagnetic field and current carrying capacity has not been carefully evaluated

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
  • Directly buried cable current-carrying capacity finite element calculation method considering soil heat and humidity coupling
  • Directly buried cable current-carrying capacity finite element calculation method considering soil heat and humidity coupling
  • Directly buried cable current-carrying capacity finite element calculation method considering soil heat and humidity coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0057] Such as figure 1 As shown, a finite element calculation method for the ampacity of direct-buried cables considering soil heat-moisture coupling includes the following main calculation steps:

[0058] 1. Define the depth and half-width of the laid soil:

[0059] Considering the different laying methods of different types of cables and the number of loops, this method can set the soil depth and half-width for calculation according to needs, and the half-width is required to be no less than 5 times the width of the cable area. Here set the depth to 4m and the half width to 5m.

[0060] 2. Select the cable type and the geometric parameters of each part of the cable embedding:

[0061] Take YJLW-02 64 / 110kV 1×240mm 2 Taking the direct buried cable as an example, the geometric parameters of the cable are as follows:

[0062]

[0063] Acco...

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 a directly buried cable current-carrying capacity finite element calculation method considering soil heat and humidity coupling. The method comprises the following steps: the depth and half width of the laid soil are defined; a cable type, the geometric size of each part, the number of laying loops, an arrangement mode, contact arrangement, materials of each part, burying depth, environmental parameters, a laying soil type, materials, initial moisture content and boundary conditions are selected; a current, iteration precision and a convergence factor of initial iteration are set; a heat source item obtained through an MAXWELL equation set is introduced, a soil heat and humidity coupling model is combined, a current-carrying capacity calculation model is obtained, the grid size is set, grid division is carried out, a corresponding solver is configured, and finally the absolute difference value between the highest temperature of the cable core and the highest allowable temperature during continuous work is solved and calculated to be smaller than the iteration precision. The method has the advantages that a heat and humidity coupling model in traditional agriculture is combined with direct burial cable current-carrying capacity calculation, and accurate calculation and dynamic calculation of the current-carrying capacity are achieved.

Description

technical field [0001] The invention relates to the technical field of current-carrying capacity calculation of power cables, in particular to a finite element calculation method for direct-buried cable current-carrying capacity in consideration of soil heat-humidity coupling. This research was supported by the Science and Technology Project of State Grid Zhejiang Electric Power Co., Ltd. (5211DS17002N). Background technique [0002] The ampacity is the amount of current delivered by the direct buried cable under the condition of thermal stability, when the conductor reaches the long-term allowable working temperature. [0003] At present, the calculation of the ampacity of direct buried cables is generally based on the IEC 60287 standard, but the IEC standard can only meet the calculation of the ampacity under a single soil thermal resistance, and the results obtained are biased. [0004] Existing numerical calculation methods only consider the temperature field and electr...

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
IPC IPC(8): G06F30/23G06F113/16G06F119/08
Inventor 冯彦皓吕洪坤吴宇豪汪明军应明良俞自涛
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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