Parameter adaptive failure distance measurement method for transmission line with four-circuit on single tower

Abstract

The invention discloses a parameter adaptive failure distance measurement method for transmission line with four-circuit on a single tower. The method comprises the following steps: 1) respectively measuring voltage and current power frequency phasor of each circuit at each phase of the two ends of the transmission line in normal status and failure status; 2) obtaining four-circuit decoupling transformation matrix of the transmission line with four-circuit on the single tower, and carrying out decoupling transformation for the voltage and current power frequency phasor of each circuit at each phase of the two ends of the transmission line in normal status and failure status to obtain voltage and current power frequency phasor of four-modulus at each sequence of the two ends of the transmission line in normal status and failure status; 3) establishing an adaptive equation of positive sequence transmission parameters and characteristic resistance line parameters for the transmission line to obtain a positive sequence transmission parameter and characteristic resistance; and 4) establishing an distance measurement equation for transmission line with four-circuit on the single tower based on circular current modulus to obtain the failure distance. The invention is not affected by uncertainty of transmission line parameters, and has the advantages of easy implementation, high stability and high precision.

Description

technical field [0001] The invention relates to a fault location method for a four-circuit transmission line on the same tower, in particular to a parameter adaptive fault location method for a four-circuit transmission line on the same tower. Background technique [0002] With the coordinated and rapid development of my country's economy, the power industry, which is the lifeline of the national economy, is in a stage of great development. The scale of the power grid has been rapidly expanded, and tremendous changes have taken place in the structure of the power grid and transmission methods. Among them, due to the dense population of our country, especially the coastal areas such as East China, North China, and South China, there are many private houses, the available arable land is decreasing, the compensation for demolition is getting higher and higher, and the contradiction that the resources of transmission line corridors are restricted is becoming more and more promine...

AI Technical Summary

Problems solved by technology

[0004] Due to the complex layout of the conductors of the four-circuit transmission lines on the same pole, the phase sequence arrangement and the larger phase-to-phase distance, the mutual inductance between the conductors is very complicated. coupling, which greatly increases the difficulty of fault analysis and fault location

In addition, the parameters of transmission lines are uncertain due to the influence of objective environmental factors such as climate and temperature, and the inaccuracy of line parameters has a great impact on the accuracy of fault location

At present, there are few studies on fault analysis and fault location of four-circuit transmission lines on the same tower, and the influence of factors such as line distributed capacitance and line parameter variability are ignored. When the line is long, the fault location accuracy is poor

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