Online temperature measuring method for overhead wire

Abstract

The invention discloses an online temperature measuring method for an overhead wire. The online temperature measuring method includes steps of 1, monitoring a temperature value of the overhead conducting wire and a temperature value of a shell of online temperature measuring equipment; and 2, substituting the monitored temperature value of the overhead conducting wire and the monitored temperature value of the shell of the online temperature measuring equipment into a dynamic capacity-increasing heat circuit model to acquire real-time permissible maximum carrying capacity of a circuit, namely maximum capacity-increasing space. The online temperature measuring method has the advantages of high accuracy of measurement results obtained in low-latitude regions or regions with strong summer sunlight or in periods with strong summer sunlight, and the like.

Description

technical field [0001] The invention relates to a dynamic capacity-increasing technology for overhead transmission lines, in particular to an online temperature measurement method for overhead lines. The method is based on a dynamic capacity-increasing thermal circuit model and considers the intensity of sunlight radiation. Background technique [0002] The static thermal limit value of the current carrying capacity of the existing high-voltage overhead conductors is a conservative value calculated according to the worst environmental conditions. According to statistics, the probability of simultaneous occurrence of the harsh conditions is only 0.02%, which provides favorable conditions for the dynamic expansion of overhead transmission lines. . [0003] There are many calculation formulas for the ampacity of overhead conductors, but the calculation principles are all derived from the heat balance principle of the conductor's heat generation and heat dissipation. When there...

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Problems solved by technology

[0037] The online temperature measurement method based on the thermal circuit method model only needs to monitor the two quantities of the wire temperature and the ambient temperature, and the dynamic ampacity of the line can be calculated through the calculation model. The calculation model is simple and reliable, but the method has disadvantages It ignores the influence of solar radiation, that is, sunshine. In low-latitude areas, especially in summer, the sunshine is relatively strong. Ignoring the influence of sunshine on the heat absorption and heat dissipation of the wire will cause a large error in the calculation results.

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