Method for improving power transmission efficiency of external network

Abstract

The invention discloses a method for improving the power transmission efficiency of an external network. The method comprises the following steps of 1, performing a heating test; 2, performing a heating test on a crimping fitting matched with the wire; 3, calculating the sag of the wire; calculating the maximum sag of the wire at the temperature of 80 DEG C in the step 1 according to a corresponding line design rule; 4, calculating the safe distance between the wires; according to the method, the strength loss rate of the to-be-used wire at the continuous high temperature is calculated, the wire with the small loss rate is selected for line erection, the maximum sag of the wire at the high temperature and the corresponding crossing span and ground distance are calculated, so that a power grid is erected and transformed, and the allowable maximum temperature of the wire is increased; and the short-time current-carrying capacity required by the system under the condition of stable accidents is increased, so that the normal transmission capacity of the line is improved, namely, the transmission capacity is improved under the condition of not changing the line structure.

Description

technical field [0001] The invention relates to the technical field of power transmission lines, and the specific field is a method for improving the power transmission efficiency of an external network. Background technique [0002] At present, the Xinjiang power grid has entered the stage of AC-DC hybrid development. Combining the resource endowment of Xinjiang region and the growth trend of power demand in the central and eastern regions of my country, it is expected that the third UHV DC project will be constructed during the "14th Five-Year Plan" period. 4 UHV DC outgoing channels. Since the UHV DC failure will lead to large-scale power flow transfer, if the grid structure is not strong enough, it may cause a chain reaction, causing large fluctuations in power, voltage and frequency, and endangering the safe operation of the Xinjiang power grid. Therefore, the development of Xinjiang's 750 kV power grid must not only meet the needs of load development, but also fully co...

AI Technical Summary

Problems solved by technology

Since the UHV DC failure will lead to large-scale power flow transfer, if the grid structure is not strong enough, it may cause a chain reaction, causing large fluctuations in power, voltage and frequency, and endangering the safe operation of the Xinjiang power grid.