Traveling-Wave Fault Location for Complex Branch Power Lines
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Solution Overview
Problem
Existing fault-locating technologies for complex AC/DC power transmission and distribution lines suffer from low accuracy and reliability, particularly in multi-branch systems, due to issues with wave speed uncertainty and complex locating equations.
Innovation Solution
A method and system that utilize traveling wave head monitoring sensors to acquire arrival moments and coordinates, establishing trunk and branch line fault-locating equations to determine fault points on complex power lines, allowing for accurate and reliable fault location without needing to first determine the fault section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the traveling wave method is used for fault locating in complex power lines, then the mechanism is simple and locating speed is fast, but the wave speed is uncertain and locating accuracy deteriorates in multi-branch complex lines
Solution Approach 1:
The complex power line is segmented into multiple line sections based on monitoring point arrangements. By dividing the line into sections and analyzing traveling wave characteristics in each section separately, the method resolves the uncertainty of wave speed in complex multi-branch configurations while maintaining fast locating speed.
Solution Approach 2:
The patent introduces a new dimension of analysis by using the relationship between traveling wave arrival time differences and line section characteristics. This dimensional approach transforms the one-dimensional wave propagation problem into a multi-dimensional analysis involving time, space, and section characteristics, enabling accurate fault locating despite wave speed uncertainty.
2Measurement precision
If distributed fault-locating technology is applied to eliminate wave speed impact, then wave speed uncertainty is reduced, but the locating equation becomes complex and calculation reliability decreases
Solution Approach 1:
The patent extracts and eliminates the wave speed parameter from the fault locating calculation by using arrival time differences between monitoring points. This extraction removes the source of uncertainty while avoiding the need for complex distributed equations, maintaining calculation simplicity and reliability.
Solution Approach 2:
The patent develops a universal fault locating method that works for both simple and complex power line configurations using the same basic equation framework. The method universally applies to different line types (overhead, cable, mixed) and complex configurations without requiring different equations, thereby avoiding complexity while maintaining accuracy.
3Productivity
If existing traveling wave fault-locating equations are used in complex branch lines, then fault locating can be performed, but the calculation often fails due to poor reliability
Solution Approach 1:
The patent performs preliminary analysis by determining the faulted line section before applying the fault locating equation. By pre-identifying the section containing the fault based on traveling wave arrival patterns at monitoring points, the method ensures that the subsequent calculation is performed on valid data, preventing calculation failures and improving reliability in complex branch line configurations.
Solution Approach 2:
The patent incorporates feedback mechanisms by using the results from one monitoring point to validate and refine the fault location determination from other points. This cross-validation feedback ensures that the final fault location is reliable and prevents calculation failures that would occur with single-point measurements in complex configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables quick and accurate fault location with no dead zones, simplifying calculations and ensuring reliability by real-time wave speed calculation, addressing the limitations of double-ended traveling wave methods.
Implementation Method 1
acquiring an arrival moment when a traveling wave head reaches a corresponding monitoring point as collected by several traveling wave head monitoring sensors on the complex power line
Data Source
AI summary
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.