Abstract
Fault location in a power distribution network is a challenging task due to the presence of multilayer branches and short line lengths. Existing fault-location methods generally require measurements at both ends of each branch, which requires a large number of measuring points. The placement of measuring points at branch terminals is an approach that can be used to reduce the number of measuring points. Such a measuring point layout allows the existing fault-location methods for power distribution networks to determine fault points after identifying faulted branches. However, these methods fail to locate a fault if the faulted branch cannot be correctly identified. This paper proposes a traveling-wave-based fault-location method for branched power distribution networks without requiring faulted branches to be identified. In the proposed method, by using the first arrival times of the fault-generated traveling waves detected at the substation and each branch terminal, the computational fault time difference (CFTD) is defined. By calculating the value of CFTD, the fault point is directly searched out. Finally, the quartile method is used to eliminate the impact of the arrival-time error on the fault-location accuracy of the proposed method. The simulation results verify the high accuracy, traveling-wave velocity stability, and strong arrival-time error robustness of the proposed method.
Highlights
Power distribution networks are connected to power consumers, and faults in a power distribution network directly cause power outages
Chen et al.: computational fault time difference (CFTD)-Based Fault Location Method for Branched Power Distribution Networks currents at the fault point and branch points/branch terminals to be estimated by using measured data and Kirchhoff’s law
The method in [18] determines faulted branches and fault points by using a set of linear equations derived from the traveling-wave velocity and the first arrival times of the traveling waves detected at branch terminals
Summary
Power distribution networks are connected to power consumers, and faults in a power distribution network directly cause power outages. Several faultlocation methods for power distribution networks have been reported These methods generally require the placement of measuring points at substation and branch terminals. R. Chen et al.: CFTD-Based Fault Location Method for Branched Power Distribution Networks currents at the fault point and branch points/branch terminals to be estimated by using measured data and Kirchhoff’s law. The method in [18] determines faulted branches and fault points by using a set of linear equations derived from the traveling-wave velocity and the first arrival times of the traveling waves detected at branch terminals. This paper proposes and validates a traveling-wave faultlocation method for branched power distribution networks by utilizing the computational fault time difference (CFTD) derived from the first arrival times of the fault-generated traveling waves. The arbitrary frequency contained in traveling waves can be set to fS
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