Cable current-carrying capacity calculation method based on finite element

A flow calculation and finite element technology, applied in calculation, computer-aided design, electrical digital data processing, etc., can solve problems such as errors, cumbersome algorithms, conservative calculation results, etc., and achieve the effect of improving efficiency and great flexibility

Inactive Publication Date: 2017-09-15
SHANGHAI ELECTRIC POWER DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing technology, the calculation mainstream is to use the calculation standard IEC 60287 of the International Electrotechnical Commission (IEC). The formula in can easily calculate the ampacity, but some algorithms are too cumbersome, and the calculation results are conservative
In addition, it only gives the calculation formula for the proximity effect of single-ci

Method used

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  • Cable current-carrying capacity calculation method based on finite element
  • Cable current-carrying capacity calculation method based on finite element
  • Cable current-carrying capacity calculation method based on finite element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] Taking cross-linked polyethylene cable as an example, its ampacity needs to meet the maximum temperature of the conductor under continuous working conditions is not greater than 90 ℃, set the corresponding parameters by establishing a heat transfer model, obtain the temperature field distribution of the cable, increase the current in the conductor, and the conductor temperature reaches 90 The current at ℃ is the current carrying capacity of the cable.

[0052] In order to facilitate the comparison of simulation results, the simulation design is carried out according to a manufacturer's product manual, and compared with the value provided by the manufacturer of the corresponding conditions in the manual. The simulated cable parameters are as follows:

[0053]

[0054] The laying conditions to be calculated for carrying capacity are as follows:

[0055] Laying environment

Air 40°C

Cable laying form

Horizontal laying, spacing 250mm

[0056...

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PUM

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Abstract

The invention discloses a cable current-carrying capacity calculation method based on a finite element. Finite element simulation software is used for modeling, and through calculating simulation cable thermal field distribution, current-carrying capacity of a corresponding cross-section cable under demand environmental conditions. The steps comprise: a, setting and/or selecting a required simulation model module; b, according to actual dimensions of a cable, establishing a simulation model; c, setting solution domains of the cable and the environment where the cable is located; d, setting a boundary condition; e, meshing; f, setting solution; g, solving and calculating whether temperature of a conductor reaches maximum allowable temperature in continuous working; h, if a conclusion of the step g is yes, simulation ending, current at the maximum allowable temperature being cable current-carrying capacity; if the conclusion is no, changing a current value of the conductor, repeating step e to step g, until the conclusion is yes. The method accurately responds state of cable current-carrying capacity, and provides foundation for design and research of cable laying.

Description

technical field [0001] The invention relates to the technical field of brushes, in particular to a method for calculating the ampacity of cables based on finite elements. Background technique [0002] Cable ampacity refers to the amount of current that a cable line passes when transmitting electric energy. Under thermal stability conditions, the cable ampacity when the cable conductor reaches the long-term allowable working temperature is called the long-term allowable ampacity of the cable. [0003] In the existing technology, the calculation mainstream is to use the calculation standard IEC 60287 of the International Electrotechnical Commission (IEC). The formula in can easily calculate the ampacity, but some algorithms are too cumbersome, and the calculation results are conservative. In addition, it only gives the calculation formula for the proximity effect of single-circuit cables, and in practice, multiple circuits are often laid in clusters. For the laying forms of ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2113/16Y02E60/00
Inventor 李帅波肖鑫鑫
Owner SHANGHAI ELECTRIC POWER DESIGN INST
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