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

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...

AI Technical Summary

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

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