Measurement of partial discharges in hexane under DC voltage

Kelley, Edward F.; Nehmadi, M.; Hebner, Robert E.; Pace, M.O.; Wintenberg, A.L.; Blalock, T.V.; Foust, J.V.

doi:10.1109/ceidp.1988.26364

Cited by 4 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the case of a 5 µm cavity, it has been theoretically demonstrated that its subjection to an intense electrical field of 270 kV/cm under atmospheric pressure would yield only five electron-ion pairs after an elapse of 10 −10 s of discharge development time; the quantity of charge transferred that is associated with this event corresponds to a miniscule 1.6×10 −6 pC [17]. Obviously, in order for such microsized cavities to discharge, excessively high pressures are necessary to provide a much greater density of free charge carriers [18]. It has been demonstrated that such pressures may equal or exceed values in the order of 10 MPa [15,19,20].…”

Section: Introductionmentioning

confidence: 98%

Gas Formation in Transient Cavities Undergoing PD Pulse Burst Discharges in Transformer Oils

Pompili

Bartnikas

2014

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Partial discharges in mineral oils take place in the form of pulse bursts within minute microcavities, which are formed at high-electric field charge injection sites. The lifetime of these transient microcavities is determined by the interval between their creation and their ultimate collapse due to dynamic instability. The vapor pressure within these microcavities has been estimated to be as high as 10 MPa and lately there has been considerable speculation as to the nature and type of gases within these microcavities. Currently, carried out experiments indicate that these gases consist principally of hydrogen, CH 4 (methane), and C2H6 (ethane) with smaller traces of other lower molecular weight hydrocarbons

show abstract

Section: Introductionmentioning

confidence: 98%

Gas Formation in Transient Cavities Undergoing PD Pulse Burst Discharges in Transformer Oils

Pompili

Bartnikas

2014

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

show abstract

“…1) was being constructed. The five test stages were (1) silver paint on sample, contacted by the probe: (2) salt water over silver paint: (3) paint removed, distilled water over sample: (4) salt water again over sample; (5) needle prints on salt-water side of sample. Only in stage (5) were signals observed: they were pulses about 50 ns wide and containing 0.1 pC or less charge.…”

Section: Preliminary Observationsmentioning

confidence: 99%

New water tree monitoring technique

Pace¹,

Dyer²,

Blalock³

et al.

Annual Conference on Electrical Insulation and Dielectric Phenomena

Self Cite

View full text Add to dashboard Cite

Failure mechanisms in polymer materials under voltage stress have been studied for many years. One of the most studied but least understood mechanisms is water treeing. Water trees are categorized by type and shape and have undergone a myriad of analytical testing methods to try to explain their basic formation or initiation, growth and the driving forces behind their propagation [ll. Least understood or measured are those quantities that appear when a water tree turns into an electrical tree causing failure of the insulation.There are many new diagnostic methods being developed that might provide more information on tree growth, tree initiation and charge motion during the growth period. One such method, that was successful in measuring charge motion in liquids, is being adapted for measurement of motion of charge or water in trees within polyethylene. A direct measurement of motion appears to be feasible if one looks at the changes that occur in the measuring instrumentation in response to the transport.Presented are results on the test cell designs and setup, the detection electronics and circuitry, and some preliminary tests on detected pulses in the equipment that might be attributable to motion inside the water tree.

show abstract

An optical study of prebreakdown events in AC-stressed n-hexane

Marsden

McGrath

1991

IEEE Trans. Elect. Insul.

View full text Add to dashboard Cite

Measurement of partial discharges in hexane under DC voltage

Cited by 4 publications

References 11 publications

Gas Formation in Transient Cavities Undergoing PD Pulse Burst Discharges in Transformer Oils

Gas Formation in Transient Cavities Undergoing PD Pulse Burst Discharges in Transformer Oils

New water tree monitoring technique

An optical study of prebreakdown events in AC-stressed n-hexane

Contact Info

Product

Resources

About