Method for calculating OPGW optical cable short circuit current heat effect by using improved synthetic method

Abstract

The invention relates to a method for calculating the OPGW optical cable short circuit current heat effect by using an improved synthetic method, which comprises the following steps: giving a line structure and a geometric dimension relation, giving a current intensity value or effective value, giving (or selecting) the structure and the relevant dimension of an optical cable, giving the duration of short circuit current and respectively carrying out section processing on the time and the dimension of the optical cable; starting to solve the parameter in the next time interval by the initial condition; solving the distribution of current on all media according to the skin effect; solving heat by the current in the time interval and the area according to the current heat effect principle and further solving the temperature of the area; solving heat exchange by the temperature and the resistance in the area and further solving the current distribution; solving the heat and the temperature by the current distribution; and repeating till the calculation in the given time is finished. The invention can be used for solving the highest temperature of the optical cable and the distribution of the temperature along with time and space by giving the process of the short circuit current and solving the maximal allowable short circuit current of the given optical cable by giving limiting temperature and can also give the temperature distribution.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for calculating the thermal effect of the short-circuit current of an OPGW optical cable by using an improved comprehensive method. Background technique [0002] At present, optical fiber composite overhead ground wire (OPGW) has been used on a large scale, and its thermal effect of short-circuit current is one of the current research hotspots. Optical fiber composite overhead ground wire OPGW is a composite overhead ground wire that integrates communication functions and transmission line lightning protection functions. Therefore, in the design and selection of OPGW, it is necessary to consider both the performance requirements of optical fiber communication and the overhead ground wire. The electrical performance and mechanical strength requirements, especially the thermal effect requirements, that is, when a short-circuit fault occurs in the line, the current flowing thro...

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Problems solved by technology

[0016] In summary, the "same temperature method" is a traditional calculation method that considers that the temperatures of various metals in OPGW are exactly the same; the "different temperature method" does not consider heat transfer, and the temperatures of various metals are different; Heat, while considering the skin effect, so this method is more accurate, but does not consider the heat transfer and heat dissipation between the layers of metal

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