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Calculation of Harmonic Current and Distortion Angle in Oil Transferring System with Frequency Variation Speed-regulation

Cao Yuquan,Bai Lili,Ai Qinghui(Daqing Petroleum College,Daqing,Heilongjiang,163318,China)Sun Hui(Daqing No.2 Oil Plant,Daqing,Heilongjiang,163414,China)  
In oil transferring system with frequency variation,existing harmonics current may result in distortion power N.For this,based on the electro technology theory,determined are the power quadrangle constituted by the distortion power N,active power P,reactive power Q and apparent power S,obtained is the calculation method of the distortion power N,harmonics current,power factor and distortion angel,and relevant technical data from an example are calculated by the power quadrangle theory.
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