An overview of overcurrent and overvoltage CSI faults is presented and strategies, how to protect a CSI equipped with IGBT power switches against these failures are developed and explained. The shown strategies and the related circuits are applicable at low expense and require only minor changes in the CSI and its control.

Recently, worldwide, the controlled switch became a technical solution for reducing the switching stress. After 90es, the number of equipment which uses the controlled switch fast increased, mainly due to the achieved performances. The controlled switching can be applied to any type of commutations. Now there are dedicated controllers which are used more often for the switching of the transport...

In this paper, a comprehensive investigation of substation grounding soil structure effects on switching/lightning transients is presented. The full-wave computational solution Method Moments (MoM) adopted to solve Maxwell’s equations. significant advantage technique its ability deal effectively with systems (SGSs) at high frequency. This evaluation carried out considering two structures: (1) u...

Abstract For suppress the amplitude of overvoltage from HVDC sending terminal, an suppression scheme based on principle controllable energy dissipation was proposed. The mechanism a weak AC system under fault DC analyzed, and method operating CSREDD were Prototype develop tested, which proved correctness about design. device has been successfully applied to ±800kV Lu-Gu UHVDC transmission proje...

The use of static frequency converters, which have a high switching frequency, generates voltage pulses with rate change over time. In combination cable and motor impedance, this repetitive overvoltage at the terminals, influencing occurrence partial discharges between conductors, causing degradation insulation electric motors. Understanding effects resulting from converter–electric interaction...

This paper presents some implementation details of a threephase to three-phase matrix converter prototype. The bidirectional semiconductor switches were built using discrete IGBTs and fast diodes. Design aspects such as protection against overvoltage and short-circuit, commutation process Artigo submetido em 23/04/2010 (Id.: 1132) Revisado em 18/09/2010, 15/07/2011, 30/08/2011 Aceito sob recome...

The supply territory of the company E.ON Distribution in the Czech Republic (run by the company E.ON Czech Republic) accounts for approximately 1.5 million customers. More than 900MW of photovoltaic (PV) plants were connected to this distribution grid. It was detected the problem with overvoltage in approximately 20% low voltage distribution grids with connected PV plants and this problem has t...