Application of joint time–frequency domain reflectometry for electric power cable diagnostics

J. Wang; P.E.C. Stone; Y.-J. Shin; R.A. Dougal

Application of joint time–frequency domain reflectometry for electric power cable diagnostics

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Application of joint time–frequency domain reflectometry for electric power cable diagnostics

Author(s): J. Wang ; P.E.C. Stone ; Y.-J. Shin ; R.A. Dougal
DOI: 10.1049/iet-spr.2009.0137

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Author(s): J. Wang ¹ ; P.E.C. Stone ¹ ; Y.-J. Shin ¹ ; R.A. Dougal ¹
- Affiliations: 1: Department of Electrical Engineering, University of South Carolina, Columbia, USA
Source: Volume 4, Issue 4, August 2010, p. 395 – 405
DOI: 10.1049/iet-spr.2009.0137 , Print ISSN 1751-9675, Online ISSN 1751-9683

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The integrity of the electric power cables is vital to the safety of an entire electrical system. To ensure the health of the cables, a technique is needed for both detecting/locating defects, and predicting hard defects before they occur. The theory and limitations of the classical wiring diagnostic techniques time domain reflectometry (TDR) and frequency domain reflectometry (FDR) are discussed. This study then introduces joint time-frequency domain reflectometry (JTFDR) as a unique solution for the cable diagnostics and prognostics. By employing an interrogating incident signal and advanced post-processing of the reflected signals, JTFDR is shown to be capable of overcoming those limitations. JTFDR is experimentally proven to be successful for detecting and locating both hard and incipient defects. The prognostic capabilities of JTFDR are also demonstrated via accelerated ageing tests of an electric power cable. By utilising the incident/reflected signal information in the time and frequency domains simultaneously, JTFDR is proven to be a more effective diagnostic technique than the classical TDR and FDR. JTFDR can also be used to monitor incipient defects and better predict hard defects before they occur.

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