Development of a new type insulation diagnostic method for hot-line XLPE cables

Yamaguchi, S.; Soda, Shinnosuke; Takada, N.

doi:10.1109/61.32638

Cited by 22 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is known that dielectric dissipation factor of cable insulation increases and its breakdown voltage decreases with the growth of water trees in the cable insulation [5], therefore one of the oldest techniques still frequently used for diagnosis insulation condition is the dielectric loss tangent measurement. The ratio of loss current to capacitive current (tanδ) is extremely important as property for showing the insulation loss.…”

Section: Diagnostic Methods Using Harmonic In Loss Currentmentioning

confidence: 99%

See 1 more Smart Citation

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

Lima¹,

Finazzi²,

Carvalho³

et al. 2016

REPQJ

View full text Add to dashboard Cite

Abstract-It is widely recognized that water tree degradation would cause serious problems and it is generally agreed that is one of the most hazardous factor in the life of XLPE power cables and hence a major cause of MV power insulation premature failure. Such accidents affect the power supply system operation and reliability. Therefore, many techniques have been developed and employed in order to detect water tree at the early stages. In this context, the loss current technique is a suitable method for investigating slight degradation, since the cable degradation by water tree gives rise to harmonics components in the loss current. A comparative analysis of the values of various performance parameters that has been used in studies to evaluate the water tree degradation in power cables, obtained from the different loss current measuring circuits, is presented. This comparative analysis is made through a mathematical procedure and confirms the possibility to identify, with a very good accuracy, the loss current only from the measured leakage current without the need for specific measurement circuit used to distinguish the loss current that flows in the insulation layer. Furthermore opens the possibility to use the Fryze's equivalent conductance to eliminate in real cases the fundamental capacitive current of the total leakage current and perform online diagnosis only from the applied voltage and total leakage current measurements.

show abstract

Section: Diagnostic Methods Using Harmonic In Loss Currentmentioning

confidence: 99%

“…Some methods examine the component in a de-energized condition while others are based on measurements carried out with an energized cable but without load. The reference [5] describes a synthesis of these strategies.…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

Lima¹,

Finazzi²,

Carvalho³

et al. 2016

REPQJ

View full text Add to dashboard Cite

show abstract

“…They have excellent insulation properties and easy handling [1]. However, in spite of the excellent properties, it was found that water trees could occur in XLPE insulation depending on the environmental conditions, causing insulation deterioration, which may lead to insulation breakdown [2].…”

Section: Introductionmentioning

confidence: 99%

An approach to improve power supply continuity throughout the estimation of insulated power cable life expectance indexes

Velasco

Silva

Oliveira

et al. 2011

XI Brazilian Power Electronics Conference

View full text Add to dashboard Cite

⎯ Questions related to power quality definitely challenges engineers all over the world. Amongst these, the matter of supply reliability emerges as an important factor towards the improvement of continuity indexes such as the duration and frequency of interruptions. In such a way, information associated to the operational conditions of equipment such as transformers, cables, etc. have a relevant role in the overall electrical complex behavior. Focusing the insulated cables operational status, the occurrence of physical degradation phenomenon such as the so called water tree appears as a common cause for cable life expectance reduction. Having in mind this target, this paper considers the basis related to this effect and describes a procedure to estimate the actual conditions of a given cable. A hardware and software structure is then presented and first experimental results are described to highlight the proposal potentiality at finding operational indexes about the component life expectance.

show abstract

“…In particular, when seeking practical ways for determining the final effects of water tree phenomena on cable degradation and observing studies about modeling and diagnosis, several researches, like those presented in [1][2][3][4][5][6][7][8][9], are intended to propose procedures to detect this kind of failure through the extraction of information from performance parameters that indicate the degradation level of the insulation layer of a power cable. The methods found in the aforementioned references have different approaches to ascertain power cable status.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Methods at Estimating Insulated Cables Degradation

Velasco¹,

Reis²,

Oliveira

et al. 2012

REPQJ

View full text Add to dashboard Cite

The quality of electricity supply, among other issues, deals with continuity indicators as one of the most important factors for the characterization of an adequate service as far as power quality is concerned. In this context, one of the major problems responsible for the unscheduled interruptions is related to the degradation of electrical cables insulation and the well-known water tree effect emerges as an important cause for the deterioration of their insulation layer. If this phenomenon happens, a large loss of insulating properties of dielectric material used to build up such component will occur. In light of these facts, the development of procedures to evaluate, predict, and indicate the operational status of operating cables shows itself highly attractive in order to improve the quality and reliability of energy supply. Focusing on this subject, this paper presents a synthesis of existing methods and a new trend towards the mentioned matter. By using experimental measurements, carried out in medium voltage commercial operating cables in a distribution utility throughout non-invasive approach, applied voltage and insulating leakage currents are obtained to support the analysis. The data are used to obtain degradation indexes to estimate the cables physical operational conditions and the indicators found are further considered in the view of the effectiveness of the strategies for the diagnosis purposes.

show abstract

Development of a new type insulation diagnostic method for hot-line XLPE cables

Cited by 22 publications

References 0 publications

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

An approach to improve power supply continuity throughout the estimation of insulated power cable life expectance indexes

Performance Analysis of Methods at Estimating Insulated Cables Degradation

Contact Info

Product

Resources

About