Method for monitoring current-carrying capacity of power cable

Abstract

The invention relates to a method for monitoring the current-carrying capacity of a power cable, which comprises the following steps that: 1, a sensor sends acquired data to a processor; 2, according to the data, the processor combines cable engineering basic data to establish a heat balance finite element model; 3, a comparison module of the processor compares data of the heat balance finite element model and data of a cable temperature field model, if the data difference is greater than a threshold value, the step 4 is executed, and if the data difference is less than the threshold value, the step 5 is executed; 4, after the heat balance finite element model is corrected by a model correction module of the processor, the step 3 is executed again; and 5, the comparison module outputs the data of the heat balance finite element model and sends the data to a mode identification module to carry out dynamic mode identification and simultaneously, the current-carrying capacity analysis, the trend analysis, the surge summation effect analysis, the early warning and warning identification and the optimization of a power transmission and distribution scheme are carried out. Compared with the prior art, the method has the advantages of high measurement accuracy, more measurement data and the like.

Description

technical field [0001] The invention relates to a method for monitoring a power system, in particular to a method for monitoring the ampacity of a power cable. Background technique [0002] One of the important reasons for the cable failure of the power grid is the lack of effective online monitoring of the cable system. With the development of power grid transformation and construction work, the rate of urban underground cables continues to increase, and the use of power cables has increased significantly, making the monitoring, management, and maintenance of power cables more and more important. At the same time, with the load of power cables increased reliance on monitoring. The current carrying capacity of the power cable directly reflects the operating temperature of the cable conductor, and the operating conductor temperature is an important parameter of the cable. Generally, when the cable is running under the rated load, the core conductor temperature at this time ...

AI Technical Summary

Problems solved by technology

[0005] The existing technology does not comprehensively collect voltage and current data to analyze the calorific value of the cable. Therefore, there are a large number of uncertain equipment health status; at the same time, there are also a large number of interrelated parameters that cannot be monitored.

[0006] The existing technology cannot accurately derive the gradient relationship between the cable core conductor temperature and the skin temperature, cannot measure the surge effect, and cannot perform trend analysis

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