Current carrying capacity calculation method

A calculation method and flow calculation technology, applied in calculation, special data processing applications, instruments, etc., can solve the problems of difficult calculation process, cumbersome data, inaccuracy, etc., and achieve the goal of improving the transportation capacity, guaranteeing the service life and reducing fire accidents Effect

Active Publication Date: 2015-12-30
CHINA THREE GORGES UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for calculating the ampacity of cables aimed at the deficiencies of the above-mentioned prior art, which can solve the difficult and cumbersome calculation process when the existing method is used to calculate the ampacity of cables. The problem of inaccurate data

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Embodiment Construction

[0019] A method for calculating the ampacity, which includes the following steps:

[0020] 1. Define the calculation model unit type;

[0021] 2. Define material properties according to cable materials and laying environment;

[0022] 3. Establish cable-soil-air aggregate model;

[0023] 4. The Boolean operation performs superimposed operations on the model and assigns characteristics to the model so that different Elements of the model correspond to corresponding material properties;

[0024] 5. Finite element mesh division;

[0025] 6. Apply loads and constraints;

[0026] 7. Solve to get the temperature distribution cloud map of the model;

[0027] 8. Apply multiple sets of current to obtain the corresponding temperature distribution cloud map, that is, multiple sets of conductor temperature values;

[0028] 9. According to the above multiple sets of current values ​​and multiple sets of conductor temperature values, the corresponding function of conductor temperature ...

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Abstract

Disclosed is a cable current carrying capacity calculation method. A finite element method adopts finite element software as a tool. The method comprises the two main steps of simulating calculation of a cable group temperature field and numerical calculation of the current carrying capacity by using the temperature field as the condition. The method can solve the problems that the calculation process is difficult and complex and obtained data are not accurate when an existing method is adopted for calculating the cable current carrying capacity.

Description

technical field [0001] The invention belongs to the field of electrical information engineering, and in particular relates to a method for calculating the ampacity of cables. Background technique [0002] The ampacity of the cable is an important parameter that determines the transmission capacity of the cable. It refers to the steady-state operating current when the cable core temperature reaches 90°C. Its importance involves safe and reliable operation of transmission lines, economical and reasonable operation and cable life issues. If the ampacity of the cable is too large, the working temperature of the cable core will exceed the allowable value, and the life of the insulation will be shorter than expected; if the ampacity is too small, the copper or aluminum of the cable core will not be fully utilized, resulting in unnecessary waste. The determination of ampacity is a difficult and cumbersome problem, especially for occasions with complex operating conditions, such a...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 朱攀勇熊晓晨文雅姜雨朱宇笛文舒贺于波
Owner CHINA THREE GORGES UNIV
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