Fault Location in Electric Lines Using Wave Guiding Models
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fault location methods in electric lines face challenges in achieving high accuracy when current flanks are not identifiable, leading to measurement errors and inaccurate fault detection.
Innovation Solution
A method that uses reference voltage values and fictitious reference voltage values calculated based on wave guiding models, allowing for precise fault location independent of identifiable current flanks, by forming fictitious fault voltage signals and applying cross-correlation techniques to determine the fault location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current flanks are used for fault location, then fault location can be determined, but measurement errors occur when current flanks are not identifiable
Solution Approach 1:
The patent introduces fictitious reference voltage values as an intermediary element. These fictitious values are calculated based on wave guiding models and serve as a mediator between the measured reference voltage values and the fault location determination. By comparing measured reference voltage values with fictitious reference voltage values that represent wave propagation characteristics, the system can locate faults without relying on identifiable current flanks, thus resolving the contradiction between measurement precision and reliability
Solution Approach 2:
The patent changes the parameter basis for fault location from current signal characteristics (current flanks) to voltage parameter comparisons (reference voltage values and fictitious reference voltage values). This parameter transformation allows the system to determine fault location based on voltage wave propagation characteristics described by wave guiding models, eliminating the dependency on current flank identifiability and thereby improving both measurement precision and reliability
2Measurement precision
If nonlinear optimization methods are used with current and voltage phasors, then high locating accuracy is achieved, but the method requires identifiable current flanks
Solution Approach 1:
The patent extracts the essential information needed for fault location from the complex nonlinear optimization approach. Instead of using full nonlinear optimization with current and voltage phasors, the method extracts and compares specific voltage parameters (reference voltage values and fictitious reference voltage values) that directly relate to fault location. This extraction simplifies the method while maintaining high locating accuracy and removing the requirement for identifiable current flanks
3Reliability
If current flanks are not distinct, then flank detection methods fail, but fault location is still needed
Solution Approach 1:
The patent substitutes the mechanical signal processing approach (detecting current flanks) with a wave propagation model-based approach. Instead of mechanically searching for current flank characteristics in the current signal, the system uses wave guiding models to calculate fictitious reference voltage values that represent expected wave propagation. This substitution allows fault location to proceed even when current signal information is insufficient or indistinct
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
Enables accurate fault location with high precision even in cases where current flanks are not distinct, reducing measurement errors and improving detection reliability.
Implementation Method 1
fictitious first reference voltage values to be calculated on the basis of a wave guiding model, describing the wave response of the line
Data Source
AI summary
A method determines a fault location in a fault on an electric line. Accordingly first reference voltage values are determined by current and voltage sampled values at a first line end and an impedance of the line. Second reference voltage values are determined by current and voltage sampled values at a second line end and the impedance. Fictitious first reference voltage values are calculated using a wave guiding model, describing the wave response of the line, with the first reference voltage values. The fictitious first reference voltage values, in the fault-free case, correspond to the second reference voltage values at the second line end. Fictitious second reference voltage values are calculated with the second reference voltage values. The fault location is determined by the first and second reference voltage values and the first and second fictitious reference voltage values.