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Method for acquiring transient temperature rise of single cable of combined calandria

An acquisition method and combined technology, which are applied in the field of acquiring the transient temperature rise of a single cable in a combined pipe arrangement to achieve the effect of reducing the workload

Pending Publication Date: 2022-01-28
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the research status and actual operation requirements of the above-mentioned cable steady-state temperature rise calculation and analysis, it can be seen that there is currently no effective method for rapid and lean calculation of the transient temperature rise of a single cable suitable for pipe laying to support the development of cable lean operation

Method used

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  • Method for acquiring transient temperature rise of single cable of combined calandria
  • Method for acquiring transient temperature rise of single cable of combined calandria
  • Method for acquiring transient temperature rise of single cable of combined calandria

Examples

Experimental program
Comparison scheme
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Embodiment

[0075] 1. Calculation example description

[0076] 1) Simulation calculation

[0077] The basic data calculation adopts CYMCAP software, and the pipes, cables and parameter settings are as follows: Figure 4 shown. main verification image 3 Accuracy of the model shown and feasibility of varying cable sizes.

[0078] The initial ambient temperature is 20°C, a step current of 300A is applied to the cable, and the converted thermal load is 20.31W / m. The steady-state temperatures of the core, sheath, and pipe wall are 47.5°C, 40.1°C, and 31.2°C, respectively.

[0079] The initial ambient temperature is 20°C, a step current of 300A is applied to the cable, and the transient temperature of the core, sheath and pipe wall is obtained as Figure 5 shown.

[0080] 2) modeling

[0081] 21) "core-skin" model

[0082] According to the steady-state temperature rise between the core and the sheath, using R in Figure (3a) 2 =(47.5-40.1) / 20.31=0.3685. On this basis, use the genetic a...

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Abstract

The invention relates to a method for acquiring transient temperature rise of a single cable of a combined calandria, which comprises the following steps of: 1) respectively constructing a cable core-sheath model, a sheath-tube wall model and a tube wall-environment model, and performing simulation solution to obtain parameter values related to the structure of the calandria single cable in the models; 2) at the current t moment, calculating a cable heat flow I1 according to the cable current I, and respectively obtaining a cable core-sheath transient temperature rise delta T1 and a calandria wall transient temperature rise delta T2 according to the cable core-sheath model and the calandria wall-environment model of which the parameter values are determined; and 3) calculating the tube bank wall temperature T at the current t moment according to the environment temperature, calculating the cable sheath temperature T sheath according to the sheath-tube wall model, and calculating the cable core temperature at the current t moment according to the cable sheath temperature T sheath. Compared with the prior art, the method has the advantages of rapid modeling, lean calculation and the like.

Description

technical field [0001] The invention relates to the field of detection of temperature rise of pipe-arranged cables, in particular to a method for acquiring the transient temperature rise of a single cable of combined-type pipe-arranged cables. Background technique [0002] There are a large number of power cables in urban power grids represented by Beijing, Shanghai, Guangzhou, and Shenzhen. For power consumption areas of 110kV and below, especially in urban areas, soil direct burial and piping are the main laying methods. Among them, the cable groups laid by pipes are relatively close to each other, and the heat transfer effect is obvious. Generally, a relatively conservative selection of ampacity is adopted in the planning and design stage, and fixed values ​​are given for different voltages and different cross-sections, and less consideration is given to discharge. The actual condition of other cables running in the pipe. [0003] Due to the particularity of the power c...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F113/16G06F119/08
CPCG06F30/20G06F2113/16G06F2119/08
Inventor 傅晨钊司文荣李红雷贺林高凯黄华纬包海龙
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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