Method for calculating current threshold of overhead conductor

Abstract

The invention discloses a method for calculating a current threshold of an overhead conductor, and relates to the technical field of electrical conductor capacity calculating. The technical problem that errors of the calculation result of an existing method are large is solved. The method includes the specific following steps: (1) measuring the environment temperature and the conductor temperature of the sample conductor in two measurement environments, and calculating the environment temperature influence coefficient of the sample conductor according to the measured values; (2) enabling the environment temperature influence coefficient of the sample conductor to serve as the line environment temperature influence coefficient of the overhead conductor, and building a current threshold formula of the overhead conductor; (3) when the current conductor current threshold of the overhead conductor needs to be calculated, measuring the current line temperature and the current environment temperature of the overhead conductor, obtaining the current alternating current resistance of the overhead conductor, and calculating the current conductor current threshold according to the current line temperature, the current environment temperature, the current alternating current resistance and the current threshold formula of the overhead conductor. By means of the method, the errors of the calculation result of the current threshold of the conductor are small.

Description

technical field [0001] The invention relates to the technology for calculating the capacity of power conductors, in particular to a technique for calculating the current limit value of overhead conductors. Background technique [0002] Aerial conductors are important equipment for power transmission and play a vital role in power supply for users. The most important requirement for transmission lines is safe operation. Calculating the current limit value of the running transmission line can predict the temperature rise and fall of the line, which is helpful for the dispatcher to predict the current limit value of the conductor, and carry out early warning processing when an abnormal situation occurs, so as to ensure the safe and reliable operation of the overhead conductor . [0003] When calculating the current limit of overhead conductors, the existing methods only consider the radiation heat dissipation, convection heat dissipation, sunlight heat absorption and heat gene...

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Problems solved by technology

[0003] When calculating the current limit of overhead conductors, the existing methods only consider the radiation heat dissipation, convection heat dissipation, sunlight heat absorption and heat generated by line loads of the overhead conductors, and do not consider the factors affecting the heat dissipation of the overhead conductors by the ambient temperature. Therefore, the calculated The deviation of the current limit value of the overhead conductor is relatively large, which will lead to a large error in the predicted temperature of the conductor of the overhead conductor, thus affecting the safe operation of the overhead conductor

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