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Numerical Simulation and Experimental Validation of a Transmission Line Fault Location and Identification Method in the presence of Noise
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| Author(s) |
Caroline HEALY, Richard GUINEE |
| Abstract |
This paper exhibits a novel pulse tester correlation strategy through numerical simulation and key experimental findings undertaken in a laboratory controlled environment for test concept validation. This test strategy incorporates the deployment of a Pseudorandom Binary Sequence (PRBS) also known as a pseudo noise (pN) excitation as a viable competitive alternative to traditional Time Domain Reflectometry (TDR) in transmission line fault identification and location. The system identification technique resides in the unique characteristic signature produced as a consequence of the Cross Correlation (CCR) of both the induced fault echo response and PRBS test input stimulus. The distinctive manifestation of the delayed CCR profile signature also facilitates the attainment of an accurate fault location once prior knowledge of the velocity of propagation of the signal over the transmission link has been established. The PRBS possesses a wideband power spectrum which in essence is considered to be white noise like in nature which allows system identification of the transmission link. This feature allows the Cross Correlation process to be undertaken over numerous cycles at low amplitudes in the presence of normal online signal traffic and indigenous noise present. Significant results are presented in this paper to demonstrate the effectiveness of the multiple PRBS cycle correlation in transmission link noise rejection. Results clearly show noise reduction as the correlation cycle number increases which ensures that fault resolution and identification is achieved. An approximate theoretical model of the PRBS fault identification extraction process for a mismatched cable termination is also presented to verify the PRBS test technique. |
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| Filename: | 0647-epe2011-full-15400864.pdf |
| Filesize: | 192.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2012-01-26 by System |
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