Conduction and breakdown mechanismsin transformer oil

Effect of electrode surface topology on charge injection characteristics in dielectric liquids: An experimental study

“…The threshold voltage in this instance was determined from the intersection of the two linear fit lines to the two different regions. For any given configuration of the electrodes, the threshold voltage is lower for field emission than for field ionization which agrees with the studies of Butcher et al [5] and Schmidt [17]. Charge injection due to field emission is controlled by the work function of the electrode material while that due to field ionization depends on the difference between the ionization energy of the dielectric liquid and the electrode work function [3].…”

“…The threshold voltage for charge injection in air was reduced from 500 V to 10 V when copper nanorods with an aspect ratio of approximately 300 were grown onto one of two parallel electrodes by Carvalho et al [11]. The IeV characteristics have also been measured at different inter-electrode spacing [3,4,7e11], applied polarity [3,5,8] and dielectric liquid [3,4,8] to study the effect of these parameters on the threshold voltage.…”

Ion drag electrohydrodynamic (EHD) micro-pumps under a pulsed voltage

“…At moderate pulse repetition rate the magnitude of displacement current is greater and the frequent occurrences of the sudden peaks help efficient transfer of the available charges from emitter to the collector electrodes and thus generate higher pressure. At higher pulse repetition rates, the charges do not have sufficient time to reach the collector electrodes and results in lower injection current [15,34] and thus lower static pressure.…”

Quantitative study of electric conduction in mineral oil by time domain and frequency domain measurement

“…Polarization and depolarization current technique has been employed in the assessment of insulating status. It has been accepted that moisture, ageing, temperature and electric field can affect the PDC characteristics of insulating media [3][4][5].…”