Journal ArticleDOI
Dielectric spectroscopy for diagnosis of water tree deterioration in XLPE cables
Reads0
Chats0
TLDR
In this article, an HV dielectric spectroscopy system has been developed for diagnostics of water tree deteriorated extruded medium voltage cables, which is based on the measurement of nonlinear dielectrics response in the frequency domain.Abstract:
An HV dielectric spectroscopy system has been developed for diagnostics of water tree deteriorated extruded medium voltage cables. The technique is based on the measurement of nonlinear dielectric response in the frequency domain. Today's commercially available systems are capable of resolving low loss and small variations of permittivity as a function of frequency and voltage. Experience from more than 200 field measurements was combined with laboratory investigations. Small samples were used in an accelerated aging test to elucidate the correlation between water tree growth and dielectric response. Furthermore, field aged cables were investigated in the laboratory. It has been shown that the dielectric response of water tree deteriorated crosslinked polyethylene (XLPE) cables can be recognized and classified into different types of responses related to the aging status and breakdown strength. The influence of termination and artifacts such as surface currents was investigated. The measurement method enables us to separate the response of the cable from the influence of accessories. Finally, two different field studies of the implementation of the diagnostic method are presented. The field studies show that the fault rate decreased significantly when replacement strategy was based on the diagnostic criteria formulated.read more
Citations
More filters
Journal ArticleDOI
Applications of dielectric spectroscopy in time and frequency domain for HV power equipment
TL;DR: In this article, the authors proposed an off-line, on-site insulation condition assessment of HV electric power equipment and its predictive maintenance using dielectric spectroscopy in the time or frequency domain.
Journal ArticleDOI
A reliability-centered asset maintenance method for assessing the impact of maintenance in power distribution systems
TL;DR: In this article, a functional relationship between failure rate and maintenance measures has been developed for a cable component and the results show the value of using a systematic quantitative approach for investigating the effect of different maintenance strategies.
On-line detection and location of partial discharges in medium-voltage power cables
Pcjm Peter Wielen,van der +1 more
TL;DR: A submitted manuscript is the author's version of the article upon submission and before peer-review as mentioned in this paper, and the final published version features the final layout of the paper including the volume, issue and page numbers.
Journal ArticleDOI
Risk-based resource optimization for transmission system maintenance
TL;DR: In this paper, a resource optimization approach for transmission system maintenance selection and scheduling that is based on the cumulative long-term risk caused by failure of each piece of equipment is described.
Journal ArticleDOI
Extraction of high frequency power cable characteristics from S-parameter measurements
TL;DR: In this paper, a technique is developed for extraction of the wave propagation properties of power cables from S-parameter measurements, extracting the complex propagation constant and the characteristic impedance, as well as the LCRG telegrapher's equation parameters.
References
More filters
Book
Dielectric relaxation in solids
TL;DR: In this paper, a broad-brush view of dielectric relaxation in solids is presented, making use of the existence of a universality of Dielectric response regardless of a wide diversity of materials and structures with dipolar as well as charge-carrier polarization.
Journal ArticleDOI
Water treeing in polyethylene cables
E.F. Steennis,F.H. Kreuger +1 more
TL;DR: In this article, the characteristics of water trees, the effect of aging parameters on water tree growth, and the possible mechanisms of growth are considered, emphasizing vented tree development in polyethylene insulating materials.
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
Deterioration of Water-Immersed Polyethylene-Coated Wire by Treeing
TL;DR: In this paper, it is pointed out that a major cause of the deterioration of polyethylene-coated wire in water is the occurrence of the "treeing" phenomena.