COMPUTER MODELING OF PLASMA FLOW SWITCHES -HIGH CURRENT SWITCHING ON PROCYON

Safety of human life is of a paramount importance. In high current switching system, switch gear protects electrical circuit. However there is need to provide confidence to working engineers during installation work on high voltage installations. To prevent accidental switching on of switch gear by unauthorized workforce, this paper proposed a more life secured switching password-enabled device that strengthen working confidence and inactivate unauthorized person from hazardous switching of electrical power installation without the notice of field working engineers.

Download Full-text

13-kV, 20-A 4H-SiC PiN Diodes for Power System Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.778-780.855 ◽

2014 ◽

Vol 778-780 ◽

pp. 855-858 ◽

Cited By ~ 4

Author(s):

Dai Okamoto ◽

Yasunori Tanaka ◽

Tomonori Mizushima ◽

Mitsuru Yoshikawa ◽

Hiroyuki Fujisawa ◽

...

Keyword(s):

Power System ◽

High Voltage ◽

Light Emission ◽

Voltage Drop ◽

High Current ◽

Forward Voltage ◽

Pin Diodes ◽

Current Switching ◽

Forward Voltage Drop

We successfully fabricated 13-kV, 20-A, 8 mm × 8 mm, drift-free 4H-SiC PiN diodes. The fabricated diodes exhibited breakdown voltages that exceeded 13 kV, a forward voltage drop of 4.9–5.3 V, and an on-resistance (RonAactive) of 12 mW·cm2. The blocking yield at 10 kV on a 3-in wafer exceeded 90%. We investigated failed devices using Candela defect maps and light-emission images and found that a few devices failed because of large defects on the chip. We also demonstrated that the fabricated diodes can be used in conducting high-voltage and high-current switching tests.

Download Full-text

Peculiarities of the plasma flow in the high current vacuum arc

20th International Symposium on Discharges and Electrical Insulation in Vacuum ◽

10.1109/isdeiv.2002.1027380 ◽

2003 ◽

Author(s):

D.L. Shmelev

Keyword(s):

Plasma Flow ◽

Vacuum Arc ◽

High Current

Download Full-text

On hybrid type of cathode attachment in high current vacuum arcs

Journal of Physics Conference Series ◽

10.1088/1742-6596/2064/1/012030 ◽

2021 ◽

Vol 2064 (1) ◽

pp. 012030

Author(s):

D L Shmelev ◽

S A Chaikovsky ◽

I V Uimanov

Keyword(s):

Plasma Flow ◽

Plasma Jet ◽

Cathode Current Density ◽

Time Instant ◽

Plasma Jets ◽

High Current ◽

Linear Mass ◽

Plasma Gun ◽

Supersonic Plasma ◽

Cathode Current

Abstract This paper discusses the issues of a possible change of the type of cathode attachment of high-current vacuum arcs (HCVA) with an average cathode current density of more than 105 A/cm2. This type of HCVA is used as pumping plasma gun in experiments with plasma puff z-pinches. These experiments showed that the measured linear mass of the HCVA plasma jet is much higher (by a factor of 10 or more) than the expected mass, which can be obtained from the assumption that cathode attachment occurs only through a multitude of cathode spots emitting supersonic plasma jets. It is shown that in HCVA of the type under consideration, at some time instant there are two types of cathode attachments - cathode spots and thermionic erosion attachment (TEA). It can be said that HCVA of this type have a hybrid cathodic attachment. Unlike cathode spots, TEA produces a subsonic plasma flow, which contributes to an increase in the linear mass of the HCVA plasma jet.

Download Full-text