Electric power line safety early warning method based on thermal circuit model

Abstract

The invention discloses an electric power line safety early warning method based on a thermal circuit model. The method comprises the following steps: constructing the thermal circuit model; constructing a correlation function of the cable surface temperature and the cable conductor temperature; constructing a correlation function of the cable conductor temperature and the cable load; according to the correlation function of the cable conductor temperature and the cable load and the maximum real-time load capable of being borne by the cable, calculating and obtaining the maximum value of the cable conductor temperature, and the maximum value serings as a safety threshold value; collecting real-time cable surface temperature and temperature and humidity of a cable operation environment, and obtaining real-time cable conductor temperature through calculation according to a correlation function of the cable surface temperature and the cable conductor temperature; and when the real-time cable conductor temperature is greater than a safety threshold value, sending safety early warning information out. The value of the temperature of the cable conductor is in direct proportion to the value of the current flowing through the cable conductor, so that whether the safety early warning information is sent or not is judged by judging whether the temperature of the cable conductor exceeds the safety threshold value or not, and the judgment accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a power line safety early warning method based on a thermal circuit model. Background technique [0002] In recent years, my country's economy has continued to grow rapidly, and electricity consumption has also increased rapidly. All walks of life cannot do without the support of electricity. The transmission capacity of the existing transmission lines is strictly limited. Once the power transmitted by the transmission line exceeds its transmission capacity, it will cause the transmission line to fail, and then cause a large-scale power outage, resulting in huge economic losses and serious personal losses. Therefore, it is of great significance to carry out safety warning on transmission lines to improve the safe, economical and reliable operation of transmission lines. [0003] For example, the Chinese patent document CN111145503A discloses "Early warning method, device, ...

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Problems solved by technology

[0004] The present invention mainly solves the technical problem of poor accuracy of the original transmission line safety early warning method; provides a power line safety early warning method based on a thermal circuit model. During the transmission line transmission of electric power, the transmission carrier of electric power is a cable conductor , the value of the temperature of the cable conductor is proportional to the magnitude of the current flowing through the cable conductor, so by judging whether the temperature of the cable conductor exceeds the safety threshold, it is judged whether to send a safety warning message, which improves the accuracy of judgment

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