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Search Publications by: Yicheng Wang (Fed)

Displaying 51 - 69 of 69

Analysis of the Degradation of Polyethylene in Air Using Electrical and Physical Data

December 1, 1998

Author(s)

J. C. Horwath, D. L. Schweickart, Yicheng Wang

Discharge currents and degradation of polyethylene from high dc electric field stress in air were investigated. A positive point-to-plane configuration was used with thin polyethylene samples on the cathode surface. Voltage, spacing and relative humidity

Characteristics of Partial Discharges on a Dielectric Surface in SF 6 -N 2 Mixtures

December 1, 1998

Author(s)

X. Han, Yicheng Wang, Loucas G. Christophorou, Richard J. Van Brunt

An important tool for improving the reliability of HV-insulation systems relies on partial discharge (PD) measurements. The assessment of the insulation failure of HV equipment using PD measurements requires an interpretation of the PD measurements

Electron Drift Velocities and Electron Attachment Coefficients in Pure CHF 3 , and its Mixtures with Argon

December 1, 1998

Author(s)

Yicheng Wang, Loucas G. Christophorou, James K. Olthoff, J. K. Verbrugge

Measurements are reported of (i) the electron drift velocity in pure trifluoromethane (CHF 3) gas and in its mixtures with argon, and (ii) electron attachment in pure CHF 3. The E/N dependence on the electron drift velocity in mixtures exhibits regions of

Effect of Temperature on Electron Attachment to and Negative Ion States of CCl 2 F 2

November 1, 1998

Author(s)

Yicheng Wang, Loucas G. Christophorou, J. K. Verbrugge

The effect of temperature on electron attachment to dichlorodifluoromethane (CCl 2F 2) has been investigated for temperatures up to 500 K and for mean electron energies from thermal to 1.0 eV using an electron swarm method. The measurements were made in

Statistical Analysis of Partial Discharge Phenomena - Time of Occurrence Distributions

October 1, 1998

Author(s)

X. Han, N. Alan Heckert, James J. Filliben, Yicheng Wang

This paper presents time-of-occurrence (phase) distributions of individual pulsating partial discharges (PDs) which occur in a point-dielectric gap in air for ac voltage conditions. It is determined that the pulse phase distribution is adequately modeled

Negative Ion Emission from a Stainless Steel Surface Due to Positive Ion Collisions

August 1, 1998

Author(s)

S. G. Walton, R. Champion, Yicheng Wang

Absolute yields of negative ions and secondary electrons resulting from positive ions impacting a stainless steel surface have been determined as a function of the impact energy. The surface conditions range from those commonly found in situ for discharge

Digital Recording and Analysis of Partial Discharges in Point-Dielectric Gaps

June 1, 1998

Author(s)

Yicheng Wang, X. Han, Richard J. Van Brunt, T. Las, H. Slowikowska, J. C. Horwath, D. L. Schweickart

Mass Spectrometric Measurement of Molecular Dissociation in Inductively-coupled Plasmas

January 1, 1998

Author(s)

Yicheng Wang, Richard J. Van Brunt, James K. Olthoff

Characterization of Pulsating Partial Discharges in SF6-N2 Mixture

November 1, 1997

Author(s)

X. Han, Yicheng Wang

Digital Recording and Analysis of Positive Partial Discharges in Air

November 1, 1997

Author(s)

Yicheng Wang, X. Han, Richard J. Van Brunt, J. C. Horwath, D. L. Schweickart

A new Surface-mediated burst mode of partial discharges is discovered in which a partial discharge pulse has a fixed probability to induce a following pulse, forming a burst of evenly separated pulses. The probability is determined for several gap voltages