Calculation Method of Current Limit of Overhead Conductor

Abstract

The invention relates to a calculation method for the current limit value of an overhead conductor, which relates to the technical field of power conductor capacity calculation, and solves the technical problem that the calculation result of the existing method has large deviations. The specific steps of the method are as follows: 1) Measure the ambient temperature and wire temperature of the sample wire in two measurement environments, and calculate the environmental temperature influence coefficient of the sample wire according to the measured values; 2) calculate the ambient temperature influence coefficient of the sample wire The coefficient is used as the influence coefficient of the line environment temperature of the overhead wire, and the current limit formula of the overhead wire is established; 3) When the current limit value of the current wire of the overhead wire needs to be calculated, the current line temperature and the current ambient temperature of the overhead wire are first measured, and obtained Calculate the current AC resistance of the overhead conductor; then calculate the current conductor current limit of the overhead conductor according to the current line temperature, current ambient temperature, current AC resistance, and current limit formula of the overhead conductor. With the method provided by the invention, the deviation of the calculation result of the wire current limit value is 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...

AI Technical Summary

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

Images