US 12,607,663 B2 · Method and system for locating fault of complex power line, device, and storage medium

Abstract

A method and a system for locating a fault of a complex power line are provided. Several monitoring points on the complex power line can be obtained by providing several traveling wave head monitoring sensors on the complex power line. The complex power line is transformed into coordinates in conjunction with an arrival moment and a location corresponding to the monitoring points, thereby establishing a trunk line fault-locating equation related to a line location, the arrival moment, and a traveling wave propagation speed, from which a first fault point can thus be derived simply and quickly. If a fault point is located on a branch line, a branch line fault-locating equation is then established to derive a second fault point. Furthermore, the first fault point and the second fault point serve as a basis for deriving a target fault point of the complex power line.

A method for locating a fault of a complex power line, comprising:

acquiring arrival moments of traveling wave heads that reach corresponding monitoring points, which are collected by several traveling wave head monitoring sensors on the complex power line, wherein the traveling wave head monitoring sensors are arranged on a trunk line and a branch line of the complex power line, and the traveling wave head monitoring sensors correspond to monitoring points on a one-to-one basis;
acquiring coordinates corresponding to all monitoring points in a target coordinate system corresponding to the complex power line, wherein an origin of coordinates of the target coordinate system is any point on the trunk line, the coordinates comprise a line location corresponding to a monitoring point and an arrival moment corresponding to the monitoring point, and the line location comprises a location on the trunk line and a location on the branch line;
locating a fault by using coordinates of first monitoring points on the trunk line, a traveling wave propagation speed between two of the first monitoring points, and a trunk line fault-locating equation, so as to obtain a coordinate of a first fault point on the trunk line, wherein the traveling wave propagation speed between two of the first monitoring points is different from a speed of light, and the traveling wave propagation speed between two of the first monitoring points is not a fixed value;
determining whether a second fault point exists on the branch line by using the coordinate of the first fault point and a coordinate of a branch point corresponding to each branch line on the trunk line;
locating a fault, if there is a second fault point on the branch line, by using the coordinate of the first fault point, the coordinates of the first monitoring points on the trunk line, coordinates of second monitoring points on the branch line, the traveling wave propagation speed between two of the first monitoring points, a traveling wave propagation speed between two of the second monitoring points, and a branch line fault-locating equation, so as to obtain a coordinate of the second fault point of the complex power line, wherein the traveling wave propagation speed between two of the second monitoring points is different from a speed of light, and the traveling wave propagation speed between two of the second monitoring points is not a fixed value;
and
determining a target fault point on the complex power line according to the coordinate of the first fault point and the coordinate of the second fault point,
wherein locating the fault by using the coordinates of the first monitoring points on the trunk line, the traveling wave propagation speed between two of the first monitoring points, and the trunk line fault-locating equation, so as to obtain the coordinate of the first fault point on the trunk line comprises:
establishing a trunk line fault-locating equation group by using the coordinates of all the first monitoring points, the traveling wave propagation speed between two of the first monitoring points, and the trunk line fault-locating equation;
determining whether the first fault point exists on the trunk line by using the traveling wave propagation speed between two of the first monitoring points in a solution of the trunk line fault-locating equation group;
and
determining the coordinate of the first fault point according to the traveling wave propagation speed between two of the first monitoring points if the first fault point exists on the trunk line,
wherein the trunk line fault-locating equation comprises:
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where (x, t) is the coordinate of the first fault point, x is a fault location on the trunk line, t is a fault occurrence moment, (xi, ti) is the coordinates of the first monitoring points, xi is a coordinate location of a first monitoring point i on the trunk line, ti is the arrival moment of the traveling wave head corresponding to the first monitoring point i, and v is the traveling wave propagation speed between two of the first monitoring points.

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Method and system for locating fault of complex power line, device, and storage medium

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Method and system for locating fault of complex power line, device, and storage medium

Life of this patent

Abstract

Claims11