A Study Based On Virtual Instrument's Parameters Measuring And Analyzing Instrument For Electrical Power Drawing System

Aimed at the harmful question of harmonic which generate in electrical drawing system, on foundation of the history of electric harmonic question studying,the classfication of electric harmonic question studying,the harm of electric harmonic, beginning from the method of electric harmonic analysis and disposal,in this paper I devise a Virtual Instrument measurement and analysis system based on graphic language-LabVIEW7.1 ,Data Acquisition-DAQ, lap computer, which can gather and analyse main parameters of electric drawing system. After abroadly studying most of harmonic measuring and analysing methods of our country and other countries, a most efficient harmonic analysing and disposing method namely Fast Fourier Transform (FFT) which can analyse harmonic in time and frequency domain is accepted at last. This measurement and analysis system can measure and analyse every rank harmonic's in electric drawing system which generated by nonlinear electric power and electron equipments, furthermore, it can also measure power factor and all kinds of power, evaluating qualification of electric energy. This measurement and analysis system can also caculate electricity consumption of electric locomotive and evaluate working capability of drawing system comprehensively, furthermore it can provide efficient gist for locomotive repairing and availble attemption for reform of repairing system. This measurement and analysis system will be applicated for A.-D.-A. electric locomotive simulattive system in laboratoary,measuring and analysing electric parameters of transformer's entrance and exit, as well as convert's exit. This measurement and analysis system could be extended into all parts of electric power system both providing electricity system and consuming electricity system at the basis of perfection.This paper mainly to accomplish the following work:determining harmonic analysing method accepted in this paper;using sensor to gather signal of voltage and current; using SCXI card to filter and isolate useless even harmful signal;using DAQ card typed DAQ card-6062E to gather signal exported from...