Patterns of partial discharge activity in XLPE: From inception to breakdown

Wang, Le; Cavallini, A.; Montanari, Gian Carlo; Testa, L.; Spa, TechImp

doi:10.1109/icsd.2010.5568121

Cited by 14 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The product N w •Q alfa provides an indication of the average number of electrons impinging the polymer surface per voltage cycle and, thus, reflects the amount of energy transferred to the surface by the discharges (indeed, a correct estimation would require the knowledge of energy distribution of the electrons in each avalanche as a function of the overvoltage at which the PD occurs, which can be done through the model described above [15]). Hence, N w •Q alfa can be used as a rough parameter to evaluate the damage growth rate R dis in equation ( 4) [20,21].…”

Section: Considerations On the Damagementioning

confidence: 99%

Evolution of pd patterns in polyethylene insulation cavities under AC voltage

Wang

Cavallini

Montanari

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

In the framework of developing defect-based life models, in which breakdown is explicitly associated with partial discharge (PD)-induced damage growth from a defect, ageing tests and PD measurements were carried out in the laboratory on polyethylene (PE) layered specimens containing artificial cavities. PD activity was monitored continuously during aging. A quasi-deterministic series of stages can be observed in the behavior of the main PD parameters (i.e. discharge repetition rate and amplitude). The evolution of the parameters reflects the physicalchemical changes taking place at the dielectric/cavity interface during the aging process. PD activity shows similar time behavior under constant cavity gas volume and constant cavity gas pressure conditions, suggesting that the variation of PD parameters may not be attributed to the variation of the gas pressure. It is speculated that the change of PD activity is related to the composition of the cavity gas, as well as to the properties of dielectric/cavity interface.

show abstract

Section: Considerations On the Damagementioning

confidence: 99%

Evolution of pd patterns in polyethylene insulation cavities under AC voltage

Wang

Cavallini

Montanari

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

show abstract

“…In these sense, the current approach starts with the assumption that PD occurring in a void of an insulation material represents the most important cause of polymeric insulation breakdown in exploitation, under different AC voltages [7]. The results underlined in this paper are obtained in the framework of modeling a life analysis/model of the PD induced degradation processes under different voltage frequencies, occurring in cavities from power cables insulation system.…”

Section: Introductionmentioning

confidence: 99%

“…The state of the art regarding power cables insulation is based on development of new physical aging/ life models for damage inception and growth from micro-cavities in polymeric materials subjected to partial discharge (PD) under different voltage frequencies [6], [7], [8]. The aim of these studies is to perform some forecasts about lifetime of insulation systems having cavities of known geometry.…”

Section: Introductionmentioning

confidence: 99%

Correlation between PDIV and life distribution under different testing waveforms

Mariut

Helerea

Cavallini

2012

2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

View full text Add to dashboard Cite

The implementation of underground distribution lines has grown significantly over the last decades due to the rapid increase of electric energy demands. But, the lifetime distribution of lines is strongly affected by the single or multiple stresses that could develop in the insulation system of the power cables. In this paper, the influence of applied voltage waveform on partial discharge activity and lifetime distribution of insulation material for power cables was investigated. In this sense, the Inverse Power Law-Weibull model was applied in order to develop a life model of the PD induced degradation processes under different voltage waveforms occurring in microcavities from the power cables insulation system. For the insulation design it is of great importance to assess the insulation threshold by using the voltage tests. As result, the step-up test method was used.

show abstract

“…Despite the case with δ = 0, with δ = 0.6, the applied voltage has a smaller sinusoidal part and a greater constant part, which causes a higher PDIV and a different charge accumulation. Typically, the transition of the PRPD patterns from rabbit-like to turtle-like is a phenomenon indicating cavity aging (e.g., electrical tree) when a sinusoidal stress is applied for long time [17][18][19]. However, it is important highlight that this phenomenon was also present in our experimental tests, where the DCP waveform was used as the stress voltage.…”

Section: Prpd Pattern Detected Under the Dcp Waveform With δ =mentioning

confidence: 88%

Time Evolution of Partial Discharges in a Dielectric Subjected to the DC Periodic Voltage

et al. 2022

View full text Add to dashboard Cite

Partial discharge (PD) detection can be considered one of the most useful tools for assessing the insulation conditions of the power apparatus in high-voltage systems. Under AC conditions, this analysis is widely employed in online and offline tests, such as type tests or commissioning, and can be carried out by applying the phase-resolved PD (PRPD) method, since the patterns can give information about the defect classification. Under DC voltages, the classic pattern recognition method cannot be performed, and the measurements show complexities related to the nature of the phenomena. For this reason, to date, a standard for PD measurements under DC does not exist. In previous papers, a new method for PD detection under DC stress voltages has been proposed by the authors. It is based on the application of a direct current periodic (DCP) waveform useful in obtaining PRPD patterns. The dependence of partial discharge inception voltage (PDIV) and PD repetition rate (PDRR) on the δ shape parameter of the DCP for different materials, as well as the capability to recognize different discharge phenomena, provided valid indications on the behavior of PD in the transition from AC to DC. The aim of this paper is to evaluate the time dependence of PD occurring in a dielectric by applying the DCP waveform. In our previous studies, the investigations were focused on the PD behavior under different values of the DC voltage periodic part. In another work, the DCP waveform with both positive and negative polarity was applied to several dielectric materials. In the proposed work, instead, the DCP waveform is applied for a long time in order to observe its effect on the PD behavior for 72 h. In this way, due to the space charge accumulation phenomenon, the aging effect, also due to the space charge accumulation phenomenon, is evaluated. The methodological approach was to acquire PRPD patterns over time and evaluate their trends in comparison with the sinusoidal case. The experimental results show that, with a DCP waveform having δ = 0.6, the aging effect similar to that provided by pure DC stress is observed, while the acquired PRPD patterns are easily interpretated, as in the AC case.

show abstract

Patterns of partial discharge activity in XLPE: From inception to breakdown

Cited by 14 publications

References 8 publications

Evolution of pd patterns in polyethylene insulation cavities under AC voltage

Evolution of pd patterns in polyethylene insulation cavities under AC voltage

Correlation between PDIV and life distribution under different testing waveforms

Time Evolution of Partial Discharges in a Dielectric Subjected to the DC Periodic Voltage

Contact Info

Product

Resources

About