A study on detection of defects in cable splice by analysis of ultrasonic signal

Based on the experiment carried out in the lab on several cables in which there are some typical PD models, the relationship between the single acoustic signal generated by the partial discharge and the apparent discharge magnitude in a line frequency cycle are researched. Further more, through the detection system which is combined of the VHF PD detection method and the acoustic emission detection method, the expressions of the relationship between the voltage value, which is gotten directly from the detection system and the apparent discharge magnitude are gotten by the curve fitting method. At the same time, the method of locating the defect manually with the acoustic sensor is introduced simply in the paper.Index Terms--acoustic emission method detection, apparent discharge magnitude calibration, partial discharge, XLPE cable I.

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Experimental study on relationships between partial discharge signals and apparent discharge magnitude in XLPE cable

Wang

Cheng²,

Liu

et al. 2008

2008 International Conference on Condition Monitoring and Diagnosis

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Study on the frequency spectrums of acoustic emission PD signals in XLPE cable accessories

Wang

Cheng²,

Liu

et al. 2008

2008 International Conference on Condition Monitoring and Diagnosis

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In this paper, four 110 kV prefabricated cable joints models containing four kinds of known representative insulation defects were designed. The models can simulate some typical PD phenomena, such as sliding discharge, floating discharge, cavity discharge and protrusion discharge. Based on them, type frequency spectrums of AE PD signals in XLPE cable joints were studied. The investigation indicated that the main frequency component of AE PD signals for XLPE cable is less than 400 kHz; the attenuation of higher frequency component is very fast; the energy is relatively centralized in 50~250kHz; the sensitivity in this band is very high; the characteristics of different PD models are apparently dissimilar from each other. The obtained results provided basis for future investigation on PD pattern identification.

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The experimental study of transmission characteristics of the PD and interference signals in the cross-bonding link-system

Wang

Liu

Yue

et al. 2010

2010 IEEE International Symposium on Electrical Insulation

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A study on detection of defects in cable splice by analysis of ultrasonic signal

Cited by 4 publications

References 1 publication

Experimental study on relationships between partial discharge signals and apparent discharge magnitude in XLPE cable

Experimental study on relationships between partial discharge signals and apparent discharge magnitude in XLPE cable

Study on the frequency spectrums of acoustic emission PD signals in XLPE cable accessories

The experimental study of transmission characteristics of the PD and interference signals in the cross-bonding link-system

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