Fault traveling wave location method of multiple branch lines of power distribution network

Abstract

The invention discloses a fault traveling wave location method of multiple branch lines of a power distribution network. According to the method of the invention, traveling wave recording devices are installed at the head end of a trunk line, the tail end of the trunk line and the tail ends of the branch lines of a detected power distribution line; time for head-end reference traveling wave signals, tail-end reference traveling wave signals and fault traveling wave signals to arrive the head end of the trunk line, the tail end of the trunk line and the tail ends of the branch lines is acquired respectively through the traveling wave recording devices; based on a theory that traveling waves are transmitted according a shortest path of a line and traveling wave transmission characteristics in line faults, the branch lines are judged with different sequences according to a first condition formula and a second condition formula, and therefore, fault intervals of the multiple branch lines of the power distribution network can be determined fast and accurately; and calculation is carried out through a double-end traveling wave fault location formula, so that the positions of fault points of the lines can be located accurately. The method of the invention has the advantages of fast and accurate fault location and small calculation quantity, and can assist in shortening power outage time, decreasing a power outage range, and improving the power supply reliability of the power distribution network.

Description

technical field [0001] The invention relates to a fault traveling wave location method for multi-branch lines of a distribution network. Background technique [0002] There are many studies on fault traveling wave detection and location of transmission lines at home and abroad, but less research on distribution lines. The distribution network has complex structure, variable operation mode, numerous line branches and frequent faults. The distribution network generally adopts the neutral point non-effective grounding method, the ground fault current is small, and the influence of the capacitive current is large. The existing fault indicator cannot detect and locate the neutral point non-effectively grounded distribution network ground fault; and the traveling wave detection and positioning technology widely used in the transmission network mainly adopts the double-terminal positioning algorithm, on the multi-branch line of the distribution network It is impossible to locate ...

AI Technical Summary

Problems solved by technology

The existing fault indicator cannot detect and locate the neutral point non-effectively grounded distribution network ground fault; and the traveling wave detection and positioning technology widely used in the transmission network mainly adopts the double-terminal positioning algorithm, on the multi-branch line of the distribution network It is impossible to locate the fault section, and it is impossible to accurately locate the fault point

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