Fault Location in Non-Homogeneous Power Lines
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Solution Overview
Problem
Existing fault location algorithms for electric power lines assume homogeneity, leading to inaccurate fault location calculations in non-homogeneous power lines due to differences in conductor types, tower configurations, and underground sections.
Innovation Solution
The method involves calculating symmetrical component magnitude profiles from measurements at each terminal, considering the unique properties of each section, to determine the faulted section and precise fault location within that section using equations that account for per-unit distances and impedances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fault location algorithms assume homogeneity of the power line, then the calculation process is simplified, but the fault location accuracy deteriorates in non-homogeneous power lines
Solution Approach 1:
The power line is divided into multiple sections based on homogeneity criteria (conductor type, tower configuration, underground/overhead status). Each section is assigned unique impedance parameters, allowing the algorithm to process each segment with appropriate characteristics rather than forcing a uniform model across the entire line.
Solution Approach 2:
Different sections of the power line are assigned different impedance parameters (R1, X1, R2, X2, R0, X0) based on their local characteristics. The algorithm selectively applies the impedance parameters corresponding to the actual line configuration in each section, ensuring local accuracy while maintaining overall system analysis.
2Ease of manufacture
If the power line is modeled as homogeneous, then the fault location algorithm is easier to implement, but the results become inaccurate when conductor types, tower configurations, or underground sections vary
Solution Approach 1:
The algorithm dynamically selects impedance parameters based on the actual line configuration. Rather than using fixed homogeneous parameters, the system adapts the impedance values (R1, X1, R0, X0) to match the specific section being analyzed, allowing the model to respond to varying line conditions while maintaining a consistent computational framework.
Solution Approach 2:
The impedance parameters are changed to reflect the actual physical characteristics of each line section. The algorithm uses different resistance and reactance values (R1, X1 for positive sequence, R0, X0 for zero sequence) depending on whether the line is homogeneous or non-homogeneous, and whether sections are overhead or underground, thereby accurately representing varying line conditions.
Data Source
AI summary
Fault location on a non-homogeneous electric power line that includes a plurality of sections by determining a section in which negative-sequence voltage magnitude profiles calculated from each terminal of the power line intersect. The fault location may determine the faulted section and determine the location of the fault within the faulted section. To determine the fault location, the negative-sequence voltage magnitude profiles may be calculated from measurements taken at each terminal of the power line and compared to determine a point where the profiles intersect. The profiles may be calculated using power line properties and measurements from each terminal.