High-voltage cable line fault positioning method and system and readable storage medium

Abstract

The embodiment of the invention provides a high-voltage cable line fault positioning method and system and a readable storage medium, and the method comprises the steps: obtaining the sheath current generated at a plurality of preset sampling points in a same cable channel, and enabling the sheath current to be higher than the sheath current generated at a plurality of preset sampling points in the same cable channel, each sampling point comprises a grounding terminal and a crossed and interconnected intermediate joint; constructing a corresponding high-dimensional data matrix according to the plurality of sheath currents obtained by sampling; clustering analysis is carried out based on the mutual reachable distance between the data objects in the high-dimensional data matrix so as to ensure the overall stability of clustering to the maximum extent, and a most stable target data class is output; and finding out target feature cluster points of the two branch clusters with the minimum density level from the target data class, and carrying out fault positioning according to the time labels corresponding to the target feature cluster points. The implementation of the method can realize more accurate fault location of the high-voltage cable line.

Description

technical field [0001] The present application relates to the technical field of line fault location, and in particular, to a high-voltage cable line fault location method, system, and readable storage medium. Background technique [0002] The fault location of the power grid is of great significance to improve the continuity of the power system. An accurate and reliable fault location method can not only reduce the manual workload of the line checker, but also help troubleshoot and quickly restore the grid work in time, so as to reduce the economic loss caused by the fault. Currently, online fault location methods for power systems are mainly based on impedance and traveling waves. Among them, the impedance-based method mainly uses the relay protection device to collect the fault voltage / current data, and locates the fault according to the parameter identification of the system impedance. Since the impedance monitored by this method may have a nonlinear relationship with ...

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Problems solved by technology

Since the impedance monitored by this method may have a nonlinear relationship with the distance between the fault point, it is difficult to directly and accurately locate the fault through the relationship between the impedance and the distance between the fault point

In addition, the traveling wave-based method mainly locates the fault by identifying the propagation time of the fault traveling wave, however, when the line distribution parameters are large or uneven, it will be difficult to accurately extract the wave head and / or arrival time of the traveling wave

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