In this Master’s project, a simplified control model for HVDC classic has been built in the EMTDC simulation program with PSCAD v.4.2 interface. The control functions in the simplified control are based on functions from ABB Power Systems. A number of cases have been simulated to evaluate the simplified control model, which demand correct function during earth fault and load disturbances. The m...

HIGHLIGHTS Monitoring system with analysis through intelligent techniques. Predictive assessment of the operating conditions circuit breakers. lightning arresters in face atmospheric discharges. Process detection and localization internal faults SF6 substations.

The correct operation of surge arresters under lightning and switching transient conditions requires that grounding be effective at high frequencies as well power system frequency. Effective frequency also limits the electrocution risk to substation personnel due ground potential rise. This article assesses performance electrodes typical impulse current magnitudes. enhancement such by addition ...

The X-ray microbeam method for measurement of articulatory dynamics has been used to acquire large amounts of data, with reduced X-ray dosage, resulting in one of the most widely used freely available speech production databases. The Xray Microbeam Speech Production Database (XRMB-SPD), developed at Wisconsin University, USA, includes a vast amount of coordinate data describing articulatory mov...

This document is included in the Annex of Part 7 as historical background of a well-intentioned task that was completed at too slow a pace, missing its target date for serving as a reference for other in-process IEC standards projects concerned with low-voltage surge-protective devices. For the sake of historical accuracy and perspective, the document is presented here in its draft form, includ...

This article reviews what is known about daily emergency department (ED) surge and ED surge capacity and illustrates its potential relevance during a catastrophic event. Daily ED surge is a sudden increase in the demand for ED services. There is no well-accepted, objective measure of daily ED surge. The authors propose that daily and catastrophic ED surge can be measured by the magnitude of the...

Eye contact captures attention and receives prioritized visual processing. Here we asked whether eye contact might be processed outside conscious awareness. Faces with direct and averted gaze were rendered invisible using interocular suppression. In two experiments we found that faces with direct gaze overcame such suppression more rapidly than faces with averted gaze. Control experiments ruled...