Assuring cable reliability

Hartshorn, G.; Lanz, B.

doi:10.1109/mias.2009.933404

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…The full width at half maximum of the Fourier transform of the incident signal is 7.02 MHz. According to (5), the spatial resolution of the designed incident signal is 11.2571 m. Although the spatial resolution of TFDR is enough to detect the ASS, the peak…”

Section: Comparison With Conventional Reflectometry Methodsmentioning

confidence: 99%

“…Dielectric spectroscopy [5], dielectric loss testing [5], the isothermal relaxation current method [6], partial discharge (PD) testing [7] and reflectometry [8][9][10][11][12][13] are all used to diagnose underground power cables. Dielectric spectroscopy, dielectric loss testing and isothermal relaxation current methods can provide a global assessment of the deterioration of dielectric properties; however, these methods cannot localize defects in underground power cable systems [5]. These diagnostic methods also require the underground power cable to be disconnected from the grid while testing is being performed.…”

Section: Introductionmentioning

confidence: 99%

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Non-invasive monitoring of underground power cables using Gaussian-enveloped chirp reflectometry

Lee¹,

Lee²,

Chang³

et al. 2013

Meas. Sci. Technol.

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In this paper, we introduce non-invasive Gaussian-enveloped linear chirp (GELC) reflectometry for the diagnosis of live underground power cables. The GELC reflectometry system transmits the incident signal to live underground power cables via an inductive coupler. To improve the spatial resolution of the GELC reflectometry, we used the multiple signal classification method, which is a super-resolution method. An equalizer, which is based on Wiener filtering, is used to compensate for the signal distortion due to the propagation characteristics of underground power cables and inductive couplers. The proposed method makes it possible to detect impedance discontinuities in live underground power cables with high spatial resolution. Experiments to find the impedance discontinuity in a live underground power cable were conducted to verify the performance of the proposed method.

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Section: Comparison With Conventional Reflectometry Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-invasive monitoring of underground power cables using Gaussian-enveloped chirp reflectometry

Lee¹,

Lee²,

Chang³

et al. 2013

Meas. Sci. Technol.

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“…Despite these preventive measures, excavation works still are an important cause of cable failures. Internal cable failures can be reduced by advanced cable diagnosis [3]- [5], monitoring facilities [18], and improved installation and testing techniques. The failure frequencies of joints and terminations can be reduced significantly by clean-environment installation.…”

Section: A Reducing the Repair Time And Failure Frequencymentioning

confidence: 99%

“…Most existing studies concentrate on particular aspects of underground cable connections. For example, the diagnosis of underground cables was studied in [3]- [5], and fault localisation in [6]- [8]. A method to include the aging process of MV XLPE cables into the reliability analysis was presented in [9].…”

mentioning

confidence: 99%

Reliability of Transmission Links Consisting of Overhead Lines and Underground Cables

Tuinema

Rueda

Sluis

et al. 2016

IEEE Trans. Power Delivery

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Underground cables will be applied more often within new connections of the Extra-High-Voltage (EHV) transmission network. As EHV underground cables are a relatively new technology, not much is known about their behaviour in large transmission networks. Underground cable connections (consisting of cables, joints and terminations) are in general less reliable than traditional overhead lines, mainly because of their much longer repair time. This can negatively influence the reliability of the transmission network as well. It is therefore of interest to study the reliability of underground cable connections in detail. This paper concentrates on the reliability of EHV underground cable and overhead line connections. Based on actual failure statistics of individual components, the reliability of a connection is analysed, it is studied which factors are of influence and what measures can be taken to improve the reliability. An optimised cable repair process and a configuration with additional disconnectors are two solutions.

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