Research On Recommendation Limits Of Electric Traction Loads

Traction loads of electric railways are importance as distorting loads,it's necessary to research about traction loads' harmonic electric railways.This paper introduces the national and overseas background of researches about harmonic emission limits of electric railways briefly,some kinds of harmonic standards used in several countries, IEEE harmonic standards and IEC harmonic standards.The paper mainly discusses harmonic transform models and their transform matrixes between three phases and two phases at several models of connection of traction substations,and transforms the primary and secondary electric values of traction substations based on the above researches.The paper uses IEC 61000-3-6,G5/4 and the harmonic standard GB/T 14549-93 to discuss sub electric network and the harmonic voltages' distorting levels of several traction substations.At the same time,each harmonic voltage's distortion and the total harmonic voltage's distortion of traction substations are gained thorough calculating and analyzing the actual measure data.The paper evaluates each harmonic voltage's emission limit and the total harmonic voltage distortion factor sub electric network.From these above researches,some problems that should be paid attention to when establishing or revising rational standard are proposed.