Study On Electrical Characteristics And Distance Protection Of The Non-transposition Line Of The UHV Tower

In order to tensions and diminishing supply of electricity transmission corridors and other issues,the construction of the transmission network conditions become more complex,across the board with tower,a local with towers,a short distance without transposition in the form of erection of transmission lines in the ultra-ultra-high voltage mode continue to implement the system application.Complex three-phase line construction line parameters cause an asymmetric manner.During normal operation and fault lines,line parameters imbalance will directly lead to the line current imbalance.Because the traditional line protection algorithms are based on symmetric or order parameters tuning parameters calculated in the analysis of three-phase asymmetry,the parameter matrix element is no longer symmetric matrix,if the analysis and protection setting according to the symmetrical components,will the existence of relatively large errors that may affect the protection of the correct action.This paper analyzes the erection of transmission lines without transposition manner and without transposition mathematical model of transmission line.For non-transposition imbalance transmission lines is analyzed theoretically,and by comparing simulation simulation platform PSCAD imbalance and fault lines running under different arrangement form conductors.Study on the line because the parameters are not transposed asymmetry on the distance protection and the residual current protection action properties.Proposed can reflect the actual fault distance error correction method of symmetrical components.