Characteristic Analysis and Fault Segment Location on Negative Sequence Voltage and Current of Single Phase Line Breakage Fault in Distribution Network

Single-phase line breakage fault may cause accidents such as overvoltage, personal injury, motor damage. Aiming to reduce the difficulty in finding such faults, a novel single-phase line breakage fault detection method based on correlation coefficient of negative sequence voltage and current is proposed. The relationship between the phases of the negative sequence voltage and current is analyzed based on the negative sequence network firstly. It points out that the correlation coefficients of the negative sequence voltage and current of segments located at the upstream of the fault point are negative, while those for segments located at the downstream of fault point, on the healthy lines and on the parallel branches of the faulty line are positive. Finally, location and isolation method of the single-phase line breakage fault is proposed based on the local type feeder automation mode, intelligent distributed feeder automation mode and centralized fault automation moderespectively. Theoretical analysis and PSCAD-based simulations show that the proposed single-phase line breakage fault detection method is immune to neutral grounding mode, power factor, transition resistance and single phase line breakage fault types. Meanwhile, forthatonlylogic signalsneed to be transmitted when combined with the intelligent distributed or centralized feeder automation modes, the communication burden isrelatively low. © 2020, Power System Technology Press. All right reserved.