Over the last few deeades, application of current terrestrial computer technology in embedded spacecraft control systems has been expensive and wrought with many technical challenges. These challenges have centered on overcoming the extreme environmental constraints (protons, neutrons, gamma radiation, cosmic rays, temperature, vibration, etc.) that often preclude direct use of commercial off-t...

Abstract Recognition of any intra-oceanic arc-trench system (IOAS) could provide invaluable information on the tectonic framework and geodynamic evolution vanished ocean basin. The Tanjianshan Complex mafic-ultramafic rocks along North Qaidam ultra-high pressure metamorphic belt in NW China record subduction process Proto-Tethyan Ocean. Four lithotectonic units, including island arc, ophiolite,...

This thesis report describes an adaptive, self-checking algorithm for controlled short-circuit (fault) interruption in conjunction with high voltage alternating current SF6 circuitbreakers. The primary objective of controlled short-circuit interruption is to restrict the arcing time of the circuit-breaker to a nominal window (near the minimum arcing time) and thereby seek to reduce the electric...

Each of the eight 1.2 MW RF klystrons for the PEP-II storage rings require a 2.5 MVA DC power supply of 83 Kv at 23 amps. The design for the suply was based on three factors: low cost, small size to fit existing substation pads, and good protection against damage to the klystron including klystrong gun arcs. The supply uses a 12 pulse 12.5 KV primary thyristor “star point controller” with prima...

Steel welding is one of the most contentious academic topics nowadays. Shielded metal gas techniques’ impact on AISI1040 steel have been qualitatively investigated (MIG and TIG). The experimental layout must be developed using Taguchi approach. Arc voltage, arc current, speed, nozzle to work distance, pressure all found an effect weld quality. backing plate’s thickness as well both matter. A tr...

A single line-to-ground (SLG) fault may lead to a more severe line-to-line and power supply interruption if the ground-fault current exceeds certain value. Arc suppression device (ASD) is good solution eliminate current. novel hybrid ASD proposed in this article, which consists of passive an active one. The utilizes multiterminal breakers isolation transformer couple secondary voltage zig-zag g...

This paper is a sequel to a study by the authors of electric power systems comprising the generator circuit-breakers (GCBs) at power plant generator terminals. A sustainable assessment of the current interruption requirements of a GCB addresses the main stresses on the generator circuit breaker, revealing that the GCB current interruption requirements are significantly higher than for the distr...

Abstract The Ambon fault in the northern Banda Arc has capability of generating M w 6.9 earthquake. poses a significant seismic hazard to Island because is located near populous areas, City. Recent seismicity and surrounding areas indicates that this region actively deforming. experienced many damaging earthquakes since 17 th century. However, potential on island remains enigmatic due lack deta...

Single-line-to-ground (SLG) fault arcs cause the intermittent over-voltages, leading to short circuits within large-scale area. In this paper, a flexible arc suppression device is proposed, which adopts zigzag grounding transformer, multi-terminal breakers and an isolation transformer regulate zero-sequence voltage. Principle of voltage regulation (ZVR) method presented. By carefully choosing s...