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Real-time dynamic calculation method and system for cable carrying capacity

A flow calculation, real-time dynamic technology, applied in the field of power system, can solve the problem of not considering the influence of soil thermal resistance coefficient

Inactive Publication Date: 2017-09-01
上海海能信息科技股份有限公司
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Problems solved by technology

The influence of soil moisture migration and external environment on soil thermal resistivity is not considered

Method used

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  • Real-time dynamic calculation method and system for cable carrying capacity
  • Real-time dynamic calculation method and system for cable carrying capacity
  • Real-time dynamic calculation method and system for cable carrying capacity

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Embodiment Construction

[0046] It should be noted that, in the case of no conflict, the following technical solutions and technical features can be combined with each other.

[0047] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0048] like figure 1 As shown, a real-time dynamic calculation method for cable ampacity, the above-mentioned cable is buried in the soil; the above-mentioned calculation method includes:

[0049] Step S1, input a load current with a predetermined load value into the above-mentioned cable, and collect the first surface temperature value of the above-mentioned cable and the air temperature value, wind force value, and solar radiation value of the above-mentioned soil surface;

[0050] Step S2, using a data iteration algorithm to iteratively process a preset first soil thermal conductivity according to the predetermined load value, the first surface temperature value, the air temperature value, the ...

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Abstract

The invention provides a real-time dynamic calculation method and system for cable carrying capacity. The method comprises steps as follows: load current with a preset load value is input into a cable, and a first surface temperature value of the cable as well as an air temperature value, a wind power value and a solar radiation value of the soil surface is collected; iterative processing is performed on a preset first soil heat conductivity coefficient with a data iterative algorithm according to the values, a second soil heat conductivity coefficient is obtained, and an equivalent thermal resistance coefficient of soil is obtained; the soil is subjected to layering treatment, a layered soil model is established, external heat resistance of the soil is obtained through equivalent thermal resistance coefficient treatment; a cable body thermal circuit model is established according to scheduled rules, and the cable carrying capacity of the cable is obtained according to the cable body thermal circuit model and soil external heat resistance treatment. The method and the system have the beneficial effects as follows: a soil water migration based layered soil model analysis method and a numerical iteration analysis method are introduced into the cable thermal circuit model, so that the cable carrying capacity is calculated more accurately.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a real-time and dynamic cable carrying capacity calculation method and system. Background technique [0002] With the continuous development and progress of the power system, the number of applications of power cables is increasing, gradually occupying the dominant position. During the operation of the cable, the core conductor will generate Joule heat when the AC current passes through it. If the Joule heat generated by the current is too large, the insulation strength will decrease; if the current is too small, the cable line will not be fully utilized. Therefore, before laying the cable, the temperature field of the cable will be accurately calculated, and then the ampacity of the cable will be calculated to improve the transmission capacity of the cable. [0003] There are many variable factors that affect the current carrying capacity of cables. At present, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20Y02E60/00
Inventor 钱之银
Owner 上海海能信息科技股份有限公司
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