A Quasi-Dynamic Capacity Increase Method Based on Cable Heat Transfer Model

A heat transfer model, quasi-dynamic technology, applied in the field of electric power, can solve the problems of not dare to run the cable beyond the design capacity, difficult to achieve dynamic calculation, etc., to avoid processing heat capacity, release power transmission potential, and achieve good real-time performance.

Active Publication Date: 2017-02-15
珠海开普检测技术有限公司
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Problems solved by technology

From the perspective of different laying methods, the dynamic capacity increase of cables is relatively less difficult for the tunnel laying method, while the pipe laying method is difficult to achieve accurate dynamic calculation due to the mutual influence of adjacent cables
Some cables in China have installed dynamic capacity expansion systems, but only use optical fiber temperature measurement data for external breakage prevention and fire protection; they dare not really run the cables beyond the design capacity based on the dynamic calculation results

Method used

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  • A Quasi-Dynamic Capacity Increase Method Based on Cable Heat Transfer Model
  • A Quasi-Dynamic Capacity Increase Method Based on Cable Heat Transfer Model
  • A Quasi-Dynamic Capacity Increase Method Based on Cable Heat Transfer Model

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Embodiment

[0045] like figure 1 As shown in the figure, a quasi-dynamic capacity expansion method based on the cable heat transfer model is used to increase the capacity of the cable inside the pipe, including the following steps:

[0046] 1) According to the working conditions of the entire cable line, establish a data acquisition system in the bottleneck cable section for data measurement;

[0047]2) According to the data of the bottleneck cable section measured by the data acquisition system on the same day, establish and update the cable heat transfer model of the bottleneck cable section on the next day on a daily basis;

[0048] 3) According to the cable heat transfer model of the next day's bottleneck cable section, estimate the next day's current carrying capacity of the cable to be increased in the bottleneck cable section to realize the cable capacity increase.

[0049] Step 2) specifically includes the following steps:

[0050] 21) According to the temperature θ of the space...

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Abstract

A quasi-dynamic compatibilization method based on a cable heat transfer model, used for cable compatibilization inside a calandria. The method includes the following steps: (1) according to a working condition of a total cable line, establishing a data acquisition system at a bottleneck cable section, and carrying out data measurement on the day; (2) according to the data of the bottleneck cable section measured by the data acquisition system on the day, establishing a cable heat transfer model of the bottleneck cable section on the next day, and updating same taking a day as a unit; and (3) according to the cable heat transfer model of the bottleneck cable section on the next day, estimating the current-carrying capacity of a cable to be compatibilized on the next day in the bottleneck cable section, so as to realize cable compatibilization. Compared with the prior art, the method has the advantages of being advanced in method, good in real-time performance and obvious in effect.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a quasi-dynamic capacity increasing method based on a cable heat transfer model. Background technique [0002] At present, the central urban areas of large urban power grids have a large power load and tight cable channel resources. Some heavy-duty lines have become obvious power transmission bottlenecks. Exploiting the power transmission potential of existing cables through cable capacity expansion is of great significance for alleviating urban power supply pressure. [0003] At present, the IEC60287, IEC853, and JB / T 10181.3-2000 standards commonly used in the calculation of cable ampacity are for steady-state calculation and are not suitable for dynamic load calculation. Moreover, the current carrying capacity of the cable is determined in the design stage. Due to the complexity and uncertainty of the cable heat transfer environment, designers usually make the most unfavorable he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 李红雷贺林杨凌辉胡正勇祝达康
Owner 珠海开普检测技术有限公司
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