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Improvement in Cable Defects Assessment using Time Domain Reflectometry Technique

Affiliations

  • Department of Electrical Power Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang - 43000,, Malaysia
  • Department of Electrical Power Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang - 43000, Malaysia
  • Department of Electrical Power Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang - 43000,

Abstract


Background/Objectives: This study examines the potential of time domain reflectometry (TDR) technique in locating fault accurately along a cable due to cable insulation degradation and degradation at cable joint. Methods/Statistical Analysis: This study involves experimental verification of TDR technique in cable defect localization and identification. The experiment is divided into two parts. Part 1 investigates the ability of TDR to detect cable defect due to cable insulation degradation while part 2 investigates the effect of defect due to degraded cable joint on the TDR results. TDR results are analyzed to identify the reflections due to insulation and jointing degradations. Findings: A degraded cable can be identified by evaluating the velocity of propagation where signal propagates slower in a degraded cable, which causes delay in the reflections. A cable joint can be detected by TDR through a pair of reflections, which consists of a positive peak followed by a negative peak. A degraded joint can be recognized by comparing the amplitudes of the positive and negative peaks reflected where degraded joint gives higher positive and negative peaks. Application/Improvements: Improves the cable defects assessment by indicating the degradation of cable insulation and jointing, and pinpointing the degradation location through the time domain reflectometry technique.

Keywords

Cable, Defects, Joints, Reflectometry, Time Domain

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