Transition from streamer to Townsend mechanisms in dielectric voids

Morshuis, P.H.F.; Kreuger, F.H.

doi:10.1088/0022-3727/23/12/012

Cited by 86 publications

(46 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As already reported in the literature, in large disk-shaped voids, transition takes place from streamer mechanism to Townsend mechanism due to a conducting layer formed on the dielectric walls by discharge by-products [7][8][9][10][11]. However, an important point to note is that streamer discharges do not occur in submillimeter cavities, in the absence of the critical length required for formation of a streamer head [1].…”

Section: Introductionmentioning

confidence: 71%

“…For a relatively short anode-cathode gap distance, the effect of the micro-cavity dimensions on the discharge characteristics, from experimental as well as theoretical findings, is evident [7,[30][31][32][33][34][35][36][37][38][39][40][41]. In this paper, the length of the micro-cavity is varied from 50 to 600 lm, while the applied electric field across micro-cavity is held constant at E = 10 6 V/m.…”

Section: Micro-cavity Lengthmentioning

confidence: 88%

“…He varied the length of the cavities between 30 lm and 3.7 mm. He reports that for cavities with a diameter/length ratio )1, PD rise-time is lower [7,40] [37].…”

Section: Micro-cavity Lengthmentioning

confidence: 99%

“…They showed that the interaction of the avalanche with the solid dielectric led to charging of the barriers. Optical studies by Morshuis et al revealed a large number of separate discharging sites dependent on the void length [7,40]. They have reported that the current pulses of these separate discharges were integrated by the relatively slow detector, resulting in extremely high discharge values.…”

Section: Micro-cavity Lengthmentioning

confidence: 99%

See 3 more Smart Citations

A parametric study on the PD pulses activity within micro-cavities

Ganjovi

2015

J Theor Appl Phys

View full text Add to dashboard Cite

A two-dimensional kinetic model has been used to parametric investigation of the spark-type partial discharge pulses inside the micro-cavities. The model is based on particle-in-cell methods with Monte Carlo Collision techniques for modeling of collisions. Secondary processes like photo-emission and cathode-emission are considered. The micro-cavity may be sandwiched between two metallic conductors or two dielectrics. The discharge within the micro-cavity is studied in conjunction with the external circuit. The model is used to successfully simulate the evolution of the discharge and yield useful information about the build-up of space charge within the micro-cavity and the consequent modification of the applied electric field. The phase-space scatter plots for electrons, positive, and negative ions are obtained in order to understand the manner in which discharge progresses over time. The risetime and the magnitude of the discharge current pulse are obtained and are seen to be affected by micro-cavity dimensions, gas pressure within the micro-cavity, and the permittivity of surrounding dielectrics. The results have been compared with existing experimental, theoretical, and computational results, wherever possible. An attempt has been made to understand the nature of the variations in terms of the physical processes involved.

show abstract

Section: Introductionmentioning

confidence: 71%

Section: Micro-cavity Lengthmentioning

confidence: 88%

“…He varied the length of the cavities between 30 lm and 3.7 mm. He reports that for cavities with a diameter/length ratio )1, PD rise-time is lower [7,40] [37].…”

Section: Micro-cavity Lengthmentioning

confidence: 99%

Section: Micro-cavity Lengthmentioning

confidence: 99%

See 2 more Smart Citations

A parametric study on the PD pulses activity within micro-cavities

Ganjovi

2015

J Theor Appl Phys

View full text Add to dashboard Cite

show abstract

“…electrical field, spacecharge distribution [1][2][3], partial discharge which causes material degradation, the increase of channel conductance [4][5][6], change of gas pressure in the channels [4,[7][8][9][10] and so on.…”

Section: Introductionmentioning

confidence: 99%

A Physical Model for PD in Tree Channel and its Effects on Tree Growth

Suzuoki

Mizutani

et al. 1998

IEEJ Trans. FM

View full text Add to dashboard Cite

A model for partial discharge (PD) propagation in a single channel of an electrical tree is proposed. PD is induced by the high field near the needle tip, then propagates along the channel by field enhancement due to charge injection by PD, and stops propagating when the field becomes less than a certain value due to field divergence. This model suggests that the field distribution and the tree growth process are closely related to the behavior of PD. By considering the influences of gas pressure and the applied-voltage frequency on the behavior of PD, various phenomena of tree growth, such as the bush formation under higher gas pressure and low frequency, are qualitatively explained. This model also suggests a relation between PD and the fractal nature of treeing breakdown.

show abstract

Study on the relationship between damage of oil‐impregnated insulation paper and evolution of phase‐resolved partial discharge patterns

Liao

Yan

Yang

et al. 2010

Int Trans Elec Energy Syst

View full text Add to dashboard Cite

SUMMARYThis paper studied the relationships between evolution of phase-resolved partial discharge (PRPD) patterns and damaging characteristics, such as surface topography, surface roughness, and surface conductivity, and the constitution of gas within cavity for oil-impregnated insulation paper during the damaging process caused by partial discharge (PD). According to PRPD patterns, the damaging process can be divided into five stages. At each of the stages, surface conditions of insulation were analyzed by optical microscopy, scanning electron microscopy, atomic force microscopy, and high-resistance meter. Gas constitution was analyzed by gas chromatography-mass spectrometry, as well. Meanwhile, PRPD patterns of different gas constitution were compared, and analyzed, as well as those of different surface-damaging conditions. Results reveal that during the damaging process, the percentage content of electronegative gases descends and ascends alternately, and discharging types alternate between pseudo-glow (or glow) and spark. PRPD pattern of pseudo-glow-type discharge chiefly depends on the properties of weak electronegative gases generated during PD. PRPD patterns of spark-type discharge are chiefly determined by surface damage conditions. PRPD patterns of spark-type discharge manifest different levels of ''rabbit-ear'' and periodical features. The level of ''rabbit-ear'' feature is mostly determined by surface conductivity, while the level of periodical feature generally depends on surface trap density. In addition, surface roughness does not change shapes of PRPD patterns; however, the amount of discharge increases as the value of surface roughness declines.

show abstract

Transition from streamer to Townsend mechanisms in dielectric voids

Cited by 86 publications

References 13 publications

A parametric study on the PD pulses activity within micro-cavities

A parametric study on the PD pulses activity within micro-cavities

A Physical Model for PD in Tree Channel and its Effects on Tree Growth

Study on the relationship between damage of oil‐impregnated insulation paper and evolution of phase‐resolved partial discharge patterns

Contact Info

Product

Resources

About