THE MODEL OF TIME DOMAIN REFLECTOMETRY METHOD FOR POWER LINES WITH BRANCHED TOPOLOGY

 

R. I. Shagiev

Kazan (Volga region) Federal University

 

The paper is received on October 17, 2016

 

Abstract. The article describes a simulation model of time domain reflectometry (TDR) method for branched power line diagnostics. Developed model consists of two maim modules: generation module and processing module. Generation module is created in PSCAD/EMTDC environment and is based on phase frequency-dependent power line model. Generation module produces reflection traces for lines with arbitrary topology and allows simulating main types of faults: short circuit to ground, interphase circuit and wire breakage. The model takes into account the characteristics of the wire, the characteristics of the environment, the geometry and structure of the power lines. Processing module is created in MATLAB environment and designed for mathematical processing of the received signals. The simulation ends with the calculated distance to the line fault place. The results of the TDR method simulation demonstrated the ability to detect the main types of power lines faults with an error of no more than 0.07% (at high SNR). Attenuation of the reflected signal ranges from 10 dB to 20 dB depending on fault type.

Keywords: time domain reflectometry, TDR, reflectometer, locator, branched power lines, power lines diagnostics.

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