Stochastic properties of partial-discharge phenomena

Brunt, R. J. Van

doi:10.1109/14.99099

Cited by 205 publications

(128 citation statements)

References 279 publications

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“…The simulation parameters used are given in Table 1. The partial discharges occurring within the different types of tree structures can be characterized in terms of ~q~n patterns using statistical tools [8]. A typical PD data set acquired during the growth of a non-conducting tree can be analysed in terms of pulse count distribution Hn() and pulse magnitude distribution Hn(q).…”

Section: Resultsmentioning

confidence: 99%

Partial discharge patterns in conducting and non-conducting electrical trees

Dodd

Chalashkanov

Fothergill

2010

2010 10th IEEE International Conference on Solid Dielectrics

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Abstract-Previous observations on electrical tree growth in epoxy resins has shown that different types of tree growth structure, electrically conducting and non-conducting, can occur dependent on the state, glassy or flexible, of the epoxy resin. In this current study, the partial discharge characteristics were characterized experimentally at a temperature of 20C within two different epoxy resins systems having glass transition temperatures of 0C and 50C. The partial discharge activity (determined from apparent charge measurements) was characterized in terms of ~q~n patterns using statistical tools. The aim was to compare the apparent charge measurements obtained from conducting and non-conducting electrical tree structures with computer simulations of the partial discharge activity in both conducting and non-conducting electrical trees. The results show that there is a significant relationship between the local extent of the partial discharge phenomena, as determined by the conductivity of the tree channels, and the apparent charge, as shown by the experimental and simulated partial discharge patterns. The implications of this work for partial discharge detection as well as for condition monitoring in real insulating systems are discussed.

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Section: Resultsmentioning

confidence: 99%

Partial discharge patterns in conducting and non-conducting electrical trees

Dodd

Chalashkanov

Fothergill

2010

2010 10th IEEE International Conference on Solid Dielectrics

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“…work is partially identical to that considered in the works [46,47], where the electron detachment effect on the statistic time delay of the negative corona current pulses in the air is discussed. There seem to be no papers discussing the electron detachment in O [31].…”

Section: Modelling the Negative Pulsing Coronamentioning

confidence: 49%

Physical Mechanisms of Negative Corona Current Pulse With Secondary Oscillation

Chyhin¹

2002

Condens. Matter Phys.

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The detailed modelling of the negative corona current pulses including the secondary oscillation (SCO) has been realized, using the continuity differential equations for the fluxes of positive and negative ions and electrons, supplemented by the Poisson's equation for an electrical field in a quasione-dimensional space, as the basis for the numerical computation. The analysis of the basic plasma functions behaviour applicable to the pulsing corona in Ar+O 2 and N 2 +O 2 mixtures in the concentration region of O 2 from 2 · 10 −3 % to 0.04% has been carried out and the physical mechanisms of the secondary current oscillation have been grounded for the first time. Moreover, an effect of the photoprocesses on the parameters of the strikingly different pulses in Ar+O 2 and N 2 +O 2 mixtures is estimated for the first time. It has been determined that the SCO is caused by the field intensity oscillation in the antiphase in the surface region and in the end of the sheath. The SCO pulse can transfer into the full modes of the Trichel's pulse. Characteristics of the "precursor" and the "step" in the leading pulse front are determined by the dynamics of the volumetric charges in the sheath, whereas the SCO shape is determined by the variable flow of the positive ions to the cathode. In N 2 +O 2 the ionization of O 2 molecules by the N * 2 emitted photons leads to the adequate current rise. Pulse trailing part duration and current value are operated by the O − 2 ions collisions with the N * 2 metastables. Such processes are slowed in Ar+O 2 .

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“…The test systems consist of the HVDC generator, the icicle/iced-plate system, the current pulse sensor, CoroCAM IV*, data acquisition system and a computer [20] 7. A physical mechanism of space charge is proposed to explain the effect of space charge based on the observed phenomena;…”

Section: Methodsmentioning

confidence: 99%

“…In turn, these space charges will affect the electrical field distribution around the icicles, and consequently affect the successive discharge activities as well as their development [20] [84]. Therefore, the corona discharges at icicle tips play an important role in the formation of the initial arcs and even in the flashover process.…”

Section: Figure 1-2 Corona Discharges Along the Air Gapmentioning

confidence: 99%

“…The factors affecting the stochastic behaviour of corona pulses were summarized and they [20] include : (1) probability of initiatory electron injection as a function of Electric field strength and location; (2) the dynamics of dielectric surface charging; (3) the rates of discharge-generated ion space charge and/or metastable species dissipation; (4) fluctuations in gas density or composition; (5) presence of ionizing radiation; (6) memory propagation association with influence of residuals from previous PD pulses on the initiation and development of subsequent pulse. Statistical variations in PD behavior are often largely determined by the effects of pulse-to-pulse memory propagation whereby the residual space charge, etc.…”

Section: Statistical Properties Of Corona Pulsementioning

confidence: 99%

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Study of electric discharge and space charge formation phenomena in the air gaps of an ice-covered insulator using an icicle/ice-covered plate electrode system =

Yu¹

2007

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Stochastic properties of partial-discharge phenomena

Cited by 205 publications

References 279 publications

Partial discharge patterns in conducting and non-conducting electrical trees

Partial discharge patterns in conducting and non-conducting electrical trees

Physical Mechanisms of Negative Corona Current Pulse With Secondary Oscillation

Study of electric discharge and space charge formation phenomena in the air gaps of an ice-covered insulator using an icicle/ice-covered plate electrode system =

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