Abstract
This paper derives a model of high-voltage overhead power line under fault conditions at low radio frequencies. The derived model is essential for design of communication systems to reliably transfer information over high voltage power lines. In addition, the model can also benefit advanced systems for power-line fault detection and classification exploiting the phenomenon of changed conditions on faulted power line, resulting in change of low radio frequency signal propagation. The methodology used in the paper is based on the multiconductor system analysis and propagation of electromagnetic waves over the power lines. The model for the high voltage power line under normal operation is validated using actual measurements obtained on 400 kV power line. The proposed model of faulted power lines extends the validated power-line model under normal operation. Simulation results are provided for typical power line faults and typical fault locations. Results clearly indicate sensitivity of power-line frequency response on different fault types.
Highlights
Electricity grids are in transition from fossil-based towards a low-carbon scenario, primarily based on renewable generation
Its characteristics are measured for the middle phase to the outer phase coupling when the power line is in normal operation
In this paper we have presented the model of a faulted HV power-line in the low radio frequency range
Summary
Electricity grids are in transition from fossil-based towards a low-carbon scenario, primarily based on renewable generation This concept has led to the evolution of electrical grids to smart grids, dominantly focused on incorporation of renewable energy sources (RESs) into the electrical distribution grid and the ability to enable charging of an arbitrary number of electrical vehicles. This is a significant transition from traditional electrical (power) systems in which electricity demand was met by fossil-based bulk generated energy and conveyed to loads through transmission and distribution grids. As investments are very high, great attention is devoted to monitoring and maintaining the transmission lines
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