Study on dual characteristic of two kinds open phase running

Single phase broken line and two-phase broken line are two faults easy too see in power system,which account more in all broken line fault.So it is necessary to analyze unbalanced faults,on one hand it needs to calculate negative sequence component and zero sequence component on open phase running,and on the other it need to analyze the characteristic of electrical open phase running.By the analysis of two kinds of open phase running,this paper uses phase-coordinate and symmetrical component to draw out the equivalent compound sequence network,and calculates the phase voltage and phase current.Although they both posses different broken lines,they have obvious similar characteristic in physical essence and inherent law.By means of comparative analysis in order,this paper puts special emphasis on clarifying their dual characteristic.