Journal ArticleDOI
Medium voltage cable defects revealed by off-line partial discharge testing at power frequency
M.S. Mashikian,A. Szarkowski +1 more
TLDR
In this paper, the authors describe typical cable defects uncovered while testing over 9,000 km of medium voltage XLPE insulated cables. And they discuss the "conversion" of water trees (WT) to electrical trees (ET) which are associated with partial discharge (PD) activity in the context of laboratory research.Abstract:
This paper describes typical cable defects uncovered while testing over 9,000 km of medium voltage XLPE insulated cables. After a brief review of the testing method, the procedure that led to the identification, localization, and characterization of typical defects found in operating cables is described. The paper also discusses the "conversion" of water trees (WT) to electrical trees (ET) which are associated with partial discharge (PD) activity in the context of laboratory research. Based on actual service performance of cables, several cases in which ETs associated with WTs did not lead to cable failure even after several years of service in very harsh operating environments are citedread more
Citations
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Journal ArticleDOI
Nonlinear time series analysis of partial discharges in electrical trees of XLPE cable insulation samples
TL;DR: In this article, the authors investigated the nonlinear dynamics characteristics of the partial discharge (PD) sequence measured during the propagation of typical electrical trees in XLPE cable insulation and provided strong evidence for the existence of deterministic chaos in the PD phenomenon of electrical trees.
Patent
Diagnostic methods for electrical cables utilizing axial tomography
TL;DR: In this article, a cable diagnostic test method, systems and apparatus that advantageously utilize standing wave principles to facilitate the identification and location of defect(s) along a power cable is presented.
Journal ArticleDOI
Classification of partial discharge events in GILBS using probabilistic neural networks and the fuzzy c-means clustering approach
TL;DR: In this paper, an approach to determining classification of partial discharge (PD) events in Gas Insulated Load Break Switches (GILBS) using probabilistic neural networks (PNN) and fuzzy C-means (FCM) clustering approach is presented.
Journal ArticleDOI
Localization techniques of partial discharges at cable ends in off-line single-sided partial discharge cable measurements
TL;DR: In this paper, the authors describe three different methods that produce an unambiguous localization of partial discharge (PD) pulses produced at the cable ends, complementing the time-domain reflectometry (TDR).
Journal ArticleDOI
On the conducting and non-conducting electrical trees in XLPE cable insulation specimens
TL;DR: In this article, the conducting and non-conducting properties of electrical trees in cross-linked polyethylene (XLPE) cable insulation are studied by means of partial discharge (PD) measurement, optical microscope, confocal Raman microprobe spectroscopy and scanning electron microscopy (SEM).
References
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Journal ArticleDOI
Electrical and Electro-Chemical Treeing Effect in Polyethylene and Crosslinked Polyethylene Cables
TL;DR: In this article, general recommendations for minimizing the treeing effect in PE and XLP cables as well as for testing these cables for tree development have been made based on numerous tests.
Journal ArticleDOI
Understanding water treeing mechanisms in the development of diagnostic test methods
TL;DR: In this paper, an explanation for this nonlinearity is presented, using a mechanical approach to the water treeing phenomenon, where the water treed insulation is considered to consist of small water filled voids separated by crazing zones.
Journal ArticleDOI
Mechanism for impulse conversion of water trees to electrical trees in XLPE
TL;DR: In this paper, it was shown that an 80 kV lightning impulse can cause the water within a water tree channel to boil over a range of four orders of magnitude in water conductivity.
Proceedings ArticleDOI
Preventive maintenance testing of shielded power cable systems
TL;DR: In this paper, a preventive maintenance tool for shielded power cable systems based on the location of partial discharges is presented. But the diagnostic test method is limited in the sense that it does not cover all the locations of the discharges.