Lumped parameter is utilized to realize circuit inter-phase fault single-end ranging

The invention discloses one utilizes lumped parameter to realize circuit inter-phase fault single-end ranging.The inventive method adopts lumped parameter to describe the physical characteristics of transmission line of electricity voltage, current delivery; negative-sequence current phase calculation phase fault point voltage phase angle between the fault phase adopting line protection installation place, utilizes line protection installation place to the voltage drop of phase fault point and the linear calculating fault distance of fault distance.The inventive method according to line protection installation place to the voltage drop of phase fault point and the linear calculating fault distance of fault distance; overcome transition resistance and load current to the impact of fault localization precision; distance accuracy is high, and range measurement principle is simple, practical.The inventive method directly calculates fault distance without the need to adopting searching algorithm, and range finding speed is fast, real-time.